Research and Publications - Department of Physics & Astronomy

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Physics
(1980-10-01) Sandy, John H.
Longitudinal spin Seebeck effect contribution in transverse spin Seebeck effect experiments in Pt/YIG and Pt/NFO
(Nature Portfolio, 2015) Meier, Daniel; Reinhardt, Daniel; van Straaten, Michael; Klewe, Christoph; Althammer, Matthias; Schreier, Michael; Goennenwein, Sebastian T. B.; Gupta, Arunava; Schmid, Maximilian; Back, Christian H.; Schmalhorst, Jan-Michael; Kuschel, Timo; Reiss, Guenter; University of Bielefeld; Technical University of Munich; University of Alabama Tuscaloosa; University of Regensburg
The spin Seebeck effect, the generation of a spin current by a temperature gradient, has attracted great attention, but the interplay over a millimetre range along a thin ferromagnetic film as well as unintended side effects which hinder an unambiguous detection have evoked controversial discussions. Here, we investigate the inverse spin Hall voltage of a 10 nm thin Pt strip deposited on the magnetic insulators Y3Fe5O12 and NiFe2O4 with a temperature gradient in the film plane. We show characteristics typical of the spin Seebeck effect, although we do not observe the most striking features of the transverse spin Seebeck effect. Instead, we attribute the observed voltages to the longitudinal spin Seebeck effect generated by a contact tip induced parasitic out-of-plane temperature gradient, which depends on material, diameter and temperature of the tip.
Facile decoding of quantitative signatures from magnetic nanowire arrays
(Nature Portfolio, 2020) Kouhpanji, Mohammad Reza Zamani; Ghoreyshi, Ali; Visscher, P. B.; Stadler, Bethanie J. H.; University of Minnesota Twin Cities; Seagate Technology; University of Alabama Tuscaloosa
Magnetic nanoparticles have been proposed as contact-free minimal-background nanobarcodes, and yet it has been difficult to rapidly and reliably decode them in an assembly. Here, high aspect ratio nanoparticles, or magnetic nanowires (MNWs), are characterized using first-order reversal curves (FORC) to investigate quantitative decoding. We have synthesized four types of nanowires (differing in diameter) that might be used for barcoding, and identified four possible "signature" functions that might be used to quickly distinguish them. To test this, we have measured the signatures of several combination samples containing two or four different MNW types, and fit them to linear combinations of the individual type signatures to determine the volume ratios of the types. We find that the signature which determines the ratios most accurately involves only the slope of each FORC at its reversal field, which requires only 2-4 data points per FORC curve, reducing the measurement time by a factor of 10 to 50 compared to measuring the full FORC.
A Comparative Study of Two Fractional-Order Equivalent Electrical Circuits for Modeling the Electrical Impedance of Dental Tissues
(MDPI, 2020) Herencsar, Norbert; Freeborn, Todd J.; Kartci, Aslihan; Cicekoglu, Oguzhan; Brno University of Technology; University of Alabama Tuscaloosa; Bogazici University
Background: Electrical impedance spectroscopy (EIS) is a fast, non-invasive, and safe approach for electrical impedance measurement of biomedical tissues. Applied to dental research, EIS has been used to detect tooth cracks and caries with higher accuracy than visual or radiographic methods. Recent studies have reported age-related differences in human dental tissue impedance and utilized fractional-order equivalent circuit model parameters to represent these measurements. Objective: We aimed to highlight that fractional-order equivalent circuit models with different topologies (but same number of components) can equally well model the electrical impedance of dental tissues. Additionally, this work presents an equivalent circuit network that can be realized using Electronic Industries Alliance (EIA) standard compliant RC component values to emulate the electrical impedance characteristics of dental tissues. Results: To validate the results, the goodness of fits of electrical impedance models were evaluated visually and statistically in terms of relative error, mean absolute error (MAE), root mean squared error (RMSE), coefficient of determination (R2), Nash-Sutcliffe's efficiency (NSE), Willmott's index of agreement (WIA), or Legates's coefficient of efficiency (LCE). The fit accuracy of proposed recurrent electrical impedance models for data representative of different age groups teeth dentin supports that both models can represent the same impedance data near perfectly. Significance: With the continued exploration of fractional-order equivalent circuit models to represent biological tissue data, it is important to investigate which models and model parameters are most closely associated with clinically relevant markers and physiological structures of the tissues/materials being measured and not just "fit" with experimental data. This exploration highlights that two different fractional-order models can fit experimental dental tissue data equally well, which should be considered during studies aimed at investigating different topologies to represent biological tissue impedance and their interpretation.
Demonstration of nearly pinhole-free epitaxial aluminum thin films by sputter beam epitaxy
(Nature Portfolio, 2020) Law, Ka Ming; Budhathoki, Sujan; Ranjit, Smriti; Martin, Franziska; Thind, Arashdeep S.; Mishra, Rohan; Hauser, Adam J.; University of Alabama Tuscaloosa; Washington University (WUSTL)
Superconducting resonators with high quality factors have been fabricated from aluminum films, suggesting potential applications in quantum computing. Improvement of thin film crystal quality and removal of void and pinhole defects will improve quality factor and functional yield. Epitaxial aluminum films with superb crystallinity, high surface smoothness, and interface sharpness were successfully grown on the c-plane of sapphire using sputter beam epitaxy. This study assesses the effects of varying substrate preparation conditions and growth and prebake temperatures on crystallinity and smoothness. X-ray diffraction and reflectivity measurements yield extensive Laue oscillations and Kiessig thickness fringes for films grown at 200 degrees C under 15 mTorr Ar, indicating excellent crystallinity and surface smoothness; moreover, an additional substrate preparation procedure which involves (1) a modified substrate cleaning procedure and (2) prebake at 700 degrees C in 20 mTorr O-2 is shown by atomic force microscopy to yield nearly pinhole-free film growth while maintaining epitaxy and high crystal quality. The modified cleaning procedure is environmentally friendly and eliminates the acid etch steps common to conventional sapphire preparation, suggesting potential industrial application both on standard epitaxial and patterned surface sapphire substrates.
Carotenoids: Importance in Daily Life-Insight Gained from EPR and ENDOR
(Springer, 2021) Focsan, A. Ligia; Polyakov, Nikolay E.; Kispert, Lowell D.; Valdosta State University; Voevodsky Institute of Chemical Kinetics & Combustion SB RAS; Institute of Solid State Chemistry & Mechanochemistry, Siberian Branch of the Russian Academy of Sciences; University of Alabama Tuscaloosa
Carotenoids are indispensable molecules for life. They are present everywhere in plants, algae, bacteria whom they protect against free radicals and oxidative stress. Through the consumption of fruits and vegetables and some carotenoid-containing fish, they are introduced into the human body and, similarly, protect it. There are numerous health benefits associated with the consumption of carotenoids. Carotenoids are antioxidants but at the same time they are prone to oxidation themselves. Electron loss from the carotenoid forms a radical cation. Furthermore, proton loss from a radical cation forms a neutral radical. In this mini-review, we discuss carotenoid radicals studied in our groups by various physicochemical methods, namely the radical cations formed by electron transfer and neutral radicals formed by proton loss from the radical cations. They contain many similar hyperfine couplings due to interactions between the electron spin and numerous protons in the carotenoid. Different EPR and ENDOR methods in combination with DFT calculations have been used to distinguish the two independent carotenoid radical species. DFT predicted larger coupling constants for the neutral radical compared to the radical cation. Previously, INDO calculations miss assigned the large couplings to the radical cation. EPR and ENDOR have aided in elucidating the physisorb, electron and proton transfer processes that occur when carotenoids are adsorbed on solid artificial matrices, and predicted similar reactions in aqueous solution or in plants. After years of study of the physicochemical properties of carotenoid radicals, the different published results start to merge together for a better understanding of carotenoid radical species and their implication in biological systems. Up until 2008, the radical chemistry in artificial systems was elucidated but the correlation between quenching ability and neutral radical formation was an inspiration to look for these radical species in vivo. In addition, the EPR spin-trapping technique has been applied to study inclusion complexes of carotenoids with different delivery systems.
Gareth R. Eaton: On the Occasion of His 80th Birthday
(Springer, 2021) Bowman, Michael; Fielding, Alistair; Tseytlin, Mark; University of Alabama Tuscaloosa; Liverpool John Moores University; West Virginia University
Floquet engineering of tilted and gapped Dirac bandstructure in 1T'-MoS2
(Nature Portfolio, 2022) Iurov, Andrii; Zhemchuzhna, Liubov; Gumbs, Godfrey; Huang, Danhong; Tse, Wang-Kong; Blaise, Kathy; Ejiogu, Chinedu; City University of New York (CUNY) System; Hunter College (CUNY); University of Alabama Tuscaloosa
We have developed a rigorous theoretical formalism for Floquet engineering, investigating, and subsequently tailoring most crucial electronic properties of 1T '-MoS2 by applying an external high-frequency dressing field within the off-resonance regime. It was recently demonstrated that monolayer semiconducting 1T '-MoS2 exhibits tunable and gapped spin- and valley-polarized tilted Dirac bands. The electron-photon dressed states depend strongly on the polarization of the applied irradiation and reflect a full complexity of the low-energy Hamiltonian for non-irradiated material. We have calculated and analyzed the properties of the electron dressed states corresponding to linear and circular polarization of a dressing field by focusing on their symmetry, anisotropy, tilting, direct and indirect band gaps. Circularly polarized dressing field is known for transition into a new electronic state with broken time-reversal symmetry and a non-zero Chern number, and therefore, the combination of these topologically non-trivial phases and transitions between them could reveal some truly unique and previously unknown phenomena and applications. We have also computed and discussed the density of states for various types of 1T '-MoS2 materials and its modification in the presence of a dressing field.
Reprogramming of fibroblast cells to totipotent state by DNA demethylation
(Nature Portfolio, 2023) Ghazimoradi, Mohammad H.; Hasegawa, Kouichi; Zolghadr, Ehsan; Montazeri, Samaneh; Farivar, Shirin; Shahid Beheshti University; Kyoto University; Department of Biotechnology (DBT) India; Institute for Stem Cell Biology & Regenerative Medicine - inStem; University of Alabama Tuscaloosa; Academic Center for Education, Culture & Research (ACECR)
Many attempts have been made to induce high-quality embryonic stem cells such as pluripotent stem cells and totipotent stem cells, but challenges remain to be overcome such as appropriate methods and sources. Demethylation of the genome after fertilization is an important step to initiate zygote gene activation, which can lead to the development of new embryos. Here, we tried to induce totipotent stem cells by mimicking DNA demethylation patterns of the embryo. Our data showed, after induction of DNA demethylation via chemicals or knockdown of Dnmts, cells positive for Nanog, and Cdx2 emerged. These cells could differentiate into the pluripotent and trophoblast lineage cells in-vitro. After transferring these cells to the uterus, they can implant and form embryo-like structures. Our study showed the importance of DNA demethylation roles in totipotent stem cell induction and a new and easy way to induce this cell type.
Measurement of the relative prompt production rate of chi(c2) and chi(c1) in pp collisions at root s=7 TeV
(Springer, 2012) CMS Collaboration; European Organization for Nuclear Research (CERN); Yerevan Physics Institute; National Center of Particles & High Energy Physics - Belarus; Belarusian State University; University of Antwerp; Vrije Universiteit Brussel; Universite Libre de Bruxelles; Ghent University; Universite Catholique Louvain; University of Mons; Centro Brasileiro de Pesquisas Fisicas; Universidade do Estado do Rio de Janeiro; Universidade Estadual Paulista; Technische Universitat Wien; National Institute of Chemical Physics & Biophysics (NICPB); Universidade Federal do ABC (UFABC); California Institute of Technology; Bulgarian Academy of Sciences; University of Sofia; Chinese Academy of Sciences; Institute of High Energy Physics, CAS; Peking University; Universidad de los Andes (Colombia); University of Split; Rudjer Boskovic Institute; University of Cyprus; Charles University Prague; Egyptian Academy of Scientific Research & Technology (ASRT); Egyptian Knowledge Bank (EKB); Egyptian Network of High Energy Physics (ENHEP); University of Helsinki; Lappeenranta University of Technology; CEA; UDICE-French Research Universities; Universite Paris Saclay; Centre National de la Recherche Scientifique (CNRS); CNRS - National Institute of Nuclear and Particle Physics (IN2P3); Institut Polytechnique de Paris; Universites de Strasbourg Etablissements Associes; Universite de Strasbourg; Universite de Haute-Alsace (UHA); Universite Claude Bernard Lyon 1; Ivane Javakhishvili Tbilisi State University; RWTH Aachen University; Helmholtz Association; Deutsches Elektronen-Synchrotron (DESY); University of Hamburg; Karlsruhe Institute of Technology; National & Kapodistrian University of Athens; University of Ioannina; Eotvos Lorand Research Network; Hungarian Academy of Sciences; Hungarian Wigner Research Centre for Physics; Hungarian Institute for Nuclear Research; University of Debrecen; Panjab University; University of Delhi; Saha Institute of Nuclear Physics; Bhabha Atomic Research Center (BARC); Tata Institute of Fundamental Research (TIFR); Universita degli Studi di Bari Aldo Moro; Politecnico di Bari; Istituto Nazionale di Fisica Nucleare (INFN); University of Bologna; University of Catania; University of Florence; University of Genoa; University of Milano-Bicocca; University of Naples Federico II; University of Padua; University of Trento; University of Pavia; University of Perugia; University of Pisa; Scuola Normale Superiore di Pisa; Sapienza University Rome; University of Turin; University of Eastern Piedmont Amedeo Avogadro; University of Trieste; Kangwon National University; Kyungpook National University; Chonnam National University; Korea University; University of Seoul; Sungkyunkwan University (SKKU); Vilnius University; Universidad Iberoamericana Ciudad de Mexico; Benemerita Universidad Autonoma de Puebla; Universidad Autonoma de San Luis Potosi; University of Auckland; University of Canterbury; Quaid I Azam University; National Centre for Physics - Pakistan; National Centre for Nuclear Research; University of Warsaw; Laboratorio de Instrumentacao e Fisica Experimental de Particulas; Joint Institute for Nuclear Research - Russia; National Research Centre - Kurchatov Institute; Petersburg Nuclear Physics Institute; Russian Academy of Sciences; Institute for Nuclear Research of the Russian Academy of Sciences; Alikhanov Institute for Theoretical & Experimental Physics; Lomonosov Moscow State University; Russian Academy of Science Lebedev Physical Institute; Institute of High Energy Physics - IHEP; University of Belgrade; Centro de Investigaciones Energeticas, Medioambientales Tecnologicas; Autonomous University of Madrid; University of Oviedo; Consejo Superior de Investigaciones Cientificas (CSIC); Universidad de Cantabria; CSIC - Instituto de Fisica de Cantabria (IFCA); Swiss Federal Institutes of Technology Domain; Paul Scherrer Institute; ETH Zurich; University of Zurich; National Central University; National Taiwan University; Cukurova University; Middle East Technical University; Bogazici University; Istanbul Technical University; Kharkov Institute of Physics & Technology; University of Bristol; UK Research & Innovation (UKRI); Science & Technology Facilities Council (STFC); STFC Rutherford Appleton Laboratory; Imperial College London; Brunel University; Baylor University; University of Alabama Tuscaloosa; Boston University; Brown University; University of California Davis; University of California Los Angeles; University of California Riverside; University of California San Diego; University of California Santa Barbara; Carnegie Mellon University; University of Colorado Boulder; Cornell University; Fairfield University; United States Department of Energy (DOE); University of Chicago; Fermi National Accelerator Laboratory; University of Florida; Florida International University; Florida State University; Florida Institute of Technology; University of Illinois Chicago; University of Iowa; Johns Hopkins University; University of Kansas; Kansas State University; Lawrence Livermore National Laboratory; University of Maryland College Park; Massachusetts Institute of Technology (MIT); University of Minnesota Twin Cities; University of Mississippi; University of Nebraska Lincoln; State University of New York (SUNY) Buffalo; Northeastern University; Northwestern University; University of Notre Dame; Ohio State University; Princeton University; University of Puerto Rico; University of Puerto Rico Mayaguez; Purdue University; Purdue University West Lafayette Campus; Rice University; University of Rochester; Rockefeller University; Rutgers State University New Brunswick; University of Tennessee Knoxville; Texas A&M University College Station; Texas Tech University; Vanderbilt University; University of Virginia; Wayne State University; University of Wisconsin Madison; Suez Canal University; Zewail City of Science & Technology; Visva Bharati University; Islamic Azad University; Guglielmo Marconi University; Izmir Institute of Technology; Kafkas University; Utah Valley University
Ameasurement is presented of the relative prompt production rate of chi(c2) and chi(c1) with 4.6 fb(-1) of data collected by the CMS experiment at the LHC in pp collisions at root s = 7 TeV. The two states are measured via their radiative decays chi(c) -> J/psi + gamma, with the photon converting into an e(+)e(-) pair for J/psi rapidity \y(J/psi)\ < 1.0 and photon transverse momentum p(T)(gamma) > 0.5 GeV/c. The measurement is given for six intervals of p(T)(J/psi) between 7 and 25 GeV/c. The results are compared to theoretical predictions.
Measurement of the sum of WW and WZ production with W plus dijet events in pp collisions at root s=7 TeV
(Springer, 2013) CMS Collaboration; European Organization for Nuclear Research (CERN); Yerevan Physics Institute; National Center of Particles & High Energy Physics - Belarus; Belarusian State University; University of Antwerp; Vrije Universiteit Brussel; Universite Libre de Bruxelles; Ghent University; Universite Catholique Louvain; University of Mons; Centro Brasileiro de Pesquisas Fisicas; Universidade do Estado do Rio de Janeiro; Universidade Estadual Paulista; Bulgarian Academy of Sciences; University of Sofia; Chinese Academy of Sciences; Institute of High Energy Physics, CAS; Peking University; Universidad de los Andes (Colombia); University of Split; Rudjer Boskovic Institute; University of Cyprus; Charles University Prague; Egyptian Academy of Scientific Research & Technology (ASRT); Egyptian Knowledge Bank (EKB); Egyptian Network of High Energy Physics (ENHEP); National Institute of Chemical Physics & Biophysics (NICPB); University of Helsinki; Lappeenranta University of Technology; UDICE-French Research Universities; Universite Paris Saclay; CEA; Centre National de la Recherche Scientifique (CNRS); CNRS - National Institute of Nuclear and Particle Physics (IN2P3); Institut Polytechnique de Paris; Universites de Strasbourg Etablissements Associes; Universite de Strasbourg; Universite de Haute-Alsace (UHA); Universite Claude Bernard Lyon 1; Ivane Javakhishvili Tbilisi State University; RWTH Aachen University; Helmholtz Association; Deutsches Elektronen-Synchrotron (DESY); University of Hamburg; Karlsruhe Institute of Technology; National & Kapodistrian University of Athens; University of Ioannina; Eotvos Lorand Research Network; Hungarian Academy of Sciences; Hungarian Wigner Research Centre for Physics; Hungarian Institute for Nuclear Research; University of Debrecen; Panjab University; University of Delhi; Saha Institute of Nuclear Physics; Bhabha Atomic Research Center (BARC); Tata Institute of Fundamental Research (TIFR); Istituto Nazionale di Fisica Nucleare (INFN); Universita degli Studi di Bari Aldo Moro; Politecnico di Bari; University of Bologna; University of Catania; University of Florence; University of Genoa; University of Milano-Bicocca; University of Naples Federico II; University of Padua; University of Trento; University of Pavia; University of Perugia; University of Pisa; Scuola Normale Superiore di Pisa; Sapienza University Rome; University of Turin; University of Eastern Piedmont Amedeo Avogadro; University of Trieste; Kangwon National University; Kyungpook National University; Chonnam National University; Korea University; University of Seoul; Sungkyunkwan University (SKKU); Vilnius University; Instituto Politecnico Nacional - Mexico; Universidad Iberoamericana Ciudad de Mexico; Benemerita Universidad Autonoma de Puebla; Universidad Autonoma de San Luis Potosi; University of Auckland; University of Canterbury; Quaid I Azam University; National Centre for Physics - Pakistan; National Centre for Nuclear Research; University of Warsaw; Laboratorio de Instrumentacao e Fisica Experimental de Particulas; Joint Institute for Nuclear Research - Russia; National Research Centre - Kurchatov Institute; Petersburg Nuclear Physics Institute; Russian Academy of Sciences; Institute for Nuclear Research of the Russian Academy of Sciences; Alikhanov Institute for Theoretical & Experimental Physics; Lomonosov Moscow State University; Russian Academy of Science Lebedev Physical Institute; Institute of High Energy Physics - IHEP; University of Belgrade; Centro de Investigaciones Energeticas, Medioambientales Tecnologicas; Autonomous University of Madrid; University of Oviedo; Consejo Superior de Investigaciones Cientificas (CSIC); Universidad de Cantabria; CSIC - Instituto de Fisica de Cantabria (IFCA); Swiss Federal Institutes of Technology Domain; Paul Scherrer Institute; ETH Zurich; University of Zurich; National Central University; National Taiwan University; Chulalongkorn University; Cukurova University; Middle East Technical University; Bogazici University; Istanbul Technical University; Kharkov Institute of Physics & Technology; University of Bristol; UK Research & Innovation (UKRI); Science & Technology Facilities Council (STFC); STFC Rutherford Appleton Laboratory; Imperial College London; Brunel University; Baylor University; University of Alabama Tuscaloosa; Boston University; Brown University; University of California Davis; University of California Los Angeles; University of California Riverside; University of California San Diego; University of California Santa Barbara; California Institute of Technology; Carnegie Mellon University; University of Colorado Boulder; Cornell University; Fairfield University; United States Department of Energy (DOE); University of Chicago; Fermi National Accelerator Laboratory; University of Florida; Florida International University; Florida State University; Florida Institute of Technology; University of Illinois Chicago; University of Iowa; Johns Hopkins University; University of Kansas; Kansas State University; Lawrence Livermore National Laboratory; University of Maryland College Park; Massachusetts Institute of Technology (MIT); University of Minnesota Twin Cities; University of Mississippi; University of Nebraska Lincoln; State University of New York (SUNY) Buffalo; Northeastern University; Northwestern University; University of Notre Dame; Ohio State University; Princeton University; University of Puerto Rico; University of Puerto Rico Mayaguez; Purdue University; Purdue University West Lafayette Campus; Rice University; University of Rochester; Rockefeller University; Rutgers State University New Brunswick; University of Tennessee Knoxville; Texas A&M University College Station; Texas Tech University; Vanderbilt University; University of Virginia; Wayne State University; University of Wisconsin Madison; Technische Universitat Wien; Universidade Federal do ABC (UFABC); Suez Canal University; Zewail City of Science & Technology; Cairo University; Fayoum University; British University in Egypt; Brandenburg University of Technology Cottbus; Eotvos Lorand University; Visva Bharati University; Sharif University of Technology; Isfahan University of Technology; Shiraz University; Islamic Azad University; University of Basilicata; Guglielmo Marconi University; University of Siena; University of Bucharest; University of Bern; Gaziosmanpasa University; Adiyaman University; Izmir Institute of Technology; Mersin University; Ozyegin University; Kafkas University; Suleyman Demirel University; Ege University; University of Southampton; University of Sydney; Utah Valley University; Argonne National Laboratory; Erzincan Binali Yildirim University; Mimar Sinan Guzel Sanatlar University
A measurement of the inclusive WW+WZ diboson production cross section in proton-proton collisions is reported, based on events containing a leptonically decaying W boson and exactly two jets. The data sample, collected at root s = 7 TeV with the CMS detector at the LHC, corresponds to an integrated luminosity of 5.0 fb(-1). The measured value of the sum of the inclusive WW and WZ cross sections is sigma(pp -> WW + WZ) = 68.9 +/- 8.7 (stat.) +/- 9.7 (syst.) +/- 1.5 (lum.) pb, consistent with the standard model prediction of 65.6 +/- 2.2 pb. This is the first measurement of WW+WZ production in pp collisions using this signature. No evidence for anomalous triple gauge couplings is found and upper limits are set on their magnitudes.
Search for supersymmetry in pp collisions at root s=7 TeV in events with a single lepton, jets, and missing transverse momentum
(Springer, 2013) CMS Collaboration; Yerevan Physics Institute; Belarusian State University; National Center of Particles & High Energy Physics - Belarus; University of Antwerp; Vrije Universiteit Brussel; Universite Libre de Bruxelles; Ghent University; Universite Catholique Louvain; University of Mons; Centro Brasileiro de Pesquisas Fisicas; Universidade do Estado do Rio de Janeiro; Universidade Estadual Paulista; Universidade Federal do ABC (UFABC); Bulgarian Academy of Sciences; University of Sofia; Chinese Academy of Sciences; Institute of High Energy Physics, CAS; Peking University; Universidad de los Andes (Colombia); University of Split; Rudjer Boskovic Institute; University of Cyprus; Charles University Prague; Egyptian Academy of Scientific Research & Technology (ASRT); Egyptian Knowledge Bank (EKB); Egyptian Network of High Energy Physics (ENHEP); National Institute of Chemical Physics & Biophysics (NICPB); University of Helsinki; Lappeenranta University of Technology; UDICE-French Research Universities; Universite Paris Saclay; CEA; Institut Polytechnique de Paris; Centre National de la Recherche Scientifique (CNRS); CNRS - National Institute of Nuclear and Particle Physics (IN2P3); Universites de Strasbourg Etablissements Associes; Universite de Strasbourg; Universite de Haute-Alsace (UHA); Universite Claude Bernard Lyon 1; Ivane Javakhishvili Tbilisi State University; RWTH Aachen University; Helmholtz Association; Deutsches Elektronen-Synchrotron (DESY); University of Hamburg; Karlsruhe Institute of Technology; National & Kapodistrian University of Athens; University of Ioannina; Eotvos Lorand Research Network; Hungarian Academy of Sciences; Hungarian Wigner Research Centre for Physics; Hungarian Institute for Nuclear Research; University of Debrecen; Panjab University; University of Delhi; Saha Institute of Nuclear Physics; Bhabha Atomic Research Center (BARC); Tata Institute of Fundamental Research (TIFR); Istituto Nazionale di Fisica Nucleare (INFN); Universita degli Studi di Bari Aldo Moro; Politecnico di Bari; University of Bologna; University of Catania; University of Florence; University of Genoa; University of Milano-Bicocca; University of Naples Federico II; University of Basilicata; Guglielmo Marconi University; University of Padua; University of Trento; University of Pavia; University of Perugia; University of Pisa; Scuola Normale Superiore di Pisa; Sapienza University Rome; University of Turin; University of Eastern Piedmont Amedeo Avogadro; University of Trieste; Kangwon National University; Kyungpook National University; Chonnam National University; Korea University; University of Seoul; Sungkyunkwan University (SKKU); Vilnius University; Instituto Politecnico Nacional - Mexico; Universidad Iberoamericana Ciudad de Mexico; Benemerita Universidad Autonoma de Puebla; Universidad Autonoma de San Luis Potosi; University of Auckland; University of Canterbury; Quaid I Azam University; National Centre for Physics - Pakistan; National Centre for Nuclear Research; University of Warsaw; Laboratorio de Instrumentacao e Fisica Experimental de Particulas; Joint Institute for Nuclear Research - Russia; National Research Centre - Kurchatov Institute; Petersburg Nuclear Physics Institute; Russian Academy of Sciences; Institute for Nuclear Research of the Russian Academy of Sciences; Alikhanov Institute for Theoretical & Experimental Physics; Lomonosov Moscow State University; Russian Academy of Science Lebedev Physical Institute; Institute of High Energy Physics - IHEP; University of Belgrade; Centro de Investigaciones Energeticas, Medioambientales Tecnologicas; Autonomous University of Madrid; University of Oviedo; Consejo Superior de Investigaciones Cientificas (CSIC); Universidad de Cantabria; CSIC - Instituto de Fisica de Cantabria (IFCA); European Organization for Nuclear Research (CERN); Swiss Federal Institutes of Technology Domain; Paul Scherrer Institute; ETH Zurich; University of Zurich; National Central University; National Taiwan University; Chulalongkorn University; Cukurova University; Middle East Technical University; Bogazici University; Istanbul Technical University; Kharkov Institute of Physics & Technology; University of Bristol; UK Research & Innovation (UKRI); Science & Technology Facilities Council (STFC); STFC Rutherford Appleton Laboratory; Imperial College London; Brunel University; Baylor University; University of Alabama Tuscaloosa; Boston University; Brown University; University of California Davis; University of California Los Angeles; University of California Riverside; University of California San Diego; University of California Santa Barbara; California Institute of Technology; Carnegie Mellon University; University of Colorado Boulder; Cornell University; Fairfield University; United States Department of Energy (DOE); University of Chicago; Fermi National Accelerator Laboratory; University of Florida; Florida International University; Florida State University; Florida Institute of Technology; University of Illinois Chicago; University of Illinois Chicago Hospital; University of Iowa; Johns Hopkins University; University of Kansas; Kansas State University; Lawrence Livermore National Laboratory; University of Maryland College Park; Massachusetts Institute of Technology (MIT); University of Minnesota Twin Cities; University of Mississippi; University of Nebraska Lincoln; State University of New York (SUNY) Buffalo; Northeastern University; Northwestern University; University of Notre Dame; Ohio State University; Princeton University; University of Puerto Rico; University of Puerto Rico Mayaguez; Purdue University West Lafayette Campus; Purdue University; Rice University; University of Rochester; Rockefeller University; Rutgers State University New Brunswick; University of Tennessee Knoxville; Texas A&M University College Station; Texas Tech University; Vanderbilt University; University of Virginia; Wayne State University; University of Wisconsin Madison; Technische Universitat Wien; Suez Canal University; Zewail City of Science & Technology; Cairo University; Fayoum University; British University in Egypt; Brandenburg University of Technology Cottbus; Eotvos Lorand University; Visva Bharati University; Sharif University of Technology; Isfahan University of Technology; Islamic Azad University; University of Siena; University of Bucharest; University of Bern; Gaziosmanpasa University; Adiyaman University; Izmir Institute of Technology; Mersin University; Ozyegin University; Kafkas University; Suleyman Demirel University; Ege University; University of Southampton; University of Sydney; Utah Valley University; Argonne National Laboratory; Erzincan Binali Yildirim University; Mimar Sinan Guzel Sanatlar University
Results are reported from a search for new physics processes in events containing a single isolated high-transverse-momentum lepton (electron or muon), energetic jets, and large missing transverse momentum. The analysis is based on a 4.98 fb(-1) sample of proton-proton collisions at a center-of-mass energy of 7 TeV, obtained with the CMS detector at the LHC. Three separate background estimation methods, each relying primarily on control samples in the data, are applied to a range of signal regions, providing complementary approaches for estimating the background yields. The observed yields are consistent with the predicted standard model backgrounds. The results are interpreted in terms of limits on the parameter space for the constrained minimal supersymmetric extension of the standard model, as well as on cross sections for simplified models, which provide a generic description of the production and decay of new particles in specific, topology based final states.
Magnetization States of All-Oxide Spin Valves Controlled by Charge-orbital Ordering of Coupled Ferromagnets
(Nature Portfolio, 2013) Wu, Han-Chun; Mryasov, Oleg N.; Abid, Mohamed; Radican, Kevin; Shvets, Igor V.; Trinity College Dublin; University of Alabama Tuscaloosa; King Saud University
Charge-orbital ordering is commonly present in complex transition metal oxides and offers interesting opportunities for novel electronic devices. In this work, we demonstrate for the first time that the magnetization states of the spin valve can be directly manipulated by charge-orbital ordering. We investigate the interlayer exchange coupling (IEC) between two epitaxial magnetite layers separated by a nonmagnetic epitaxial MgO dielectric. We find that the state of the charge-orbital ordering in magnetite defines the strength, and even the sign of the IEC. First-principles calculations further show that the charge-orbital ordering modifies the spin polarized electronic states at the Fe3O4/MgO interfaces and results in a sufficiently large phase shift of wave function which are responsible for the observed IEC sign change across Verwey temperature. Our findings may open new interesting avenues for the electric field control of the magnetization states of spin valves via charge-orbital ordering driven IEC sign change.
Search for a standard-model-like Higgs boson with a mass in the range 145 to 1000 GeV at the LHC
(Springer, 2013) CMS Collaboration; Yerevan Physics Institute; European Organization for Nuclear Research (CERN); National Center of Particles & High Energy Physics - Belarus; Belarusian State University; University of Antwerp; Vrije Universiteit Brussel; Universite Libre de Bruxelles; Ghent University; Universite Catholique Louvain; University of Mons; Centro Brasileiro de Pesquisas Fisicas; Universidade do Estado do Rio de Janeiro; Universidade Estadual Paulista; Universidade Federal do ABC (UFABC); Bulgarian Academy of Sciences; University of Sofia; Chinese Academy of Sciences; Institute of High Energy Physics, CAS; Peking University; Universidad de los Andes (Colombia); University of Split; Rudjer Boskovic Institute; University of Cyprus; Charles University Prague; Egyptian Academy of Scientific Research & Technology (ASRT); Egyptian Knowledge Bank (EKB); Egyptian Network of High Energy Physics (ENHEP); National Institute of Chemical Physics & Biophysics (NICPB); University of Helsinki; Lappeenranta University of Technology; UDICE-French Research Universities; Universite Paris Saclay; CEA; Institut Polytechnique de Paris; Centre National de la Recherche Scientifique (CNRS); CNRS - National Institute of Nuclear and Particle Physics (IN2P3); Universites de Strasbourg Etablissements Associes; Universite de Strasbourg; Universite de Haute-Alsace (UHA); Universite Claude Bernard Lyon 1; Ivane Javakhishvili Tbilisi State University; RWTH Aachen University; Helmholtz Association; Deutsches Elektronen-Synchrotron (DESY); University of Hamburg; Karlsruhe Institute of Technology; National Centre of Scientific Research "Demokritos"; National & Kapodistrian University of Athens; University of Ioannina; Eotvos Lorand Research Network; Hungarian Academy of Sciences; Hungarian Wigner Research Centre for Physics; Hungarian Institute for Nuclear Research; University of Debrecen; Panjab University; Saha Institute of Nuclear Physics; Bhabha Atomic Research Center (BARC); Tata Institute of Fundamental Research (TIFR); University College Dublin; Istituto Nazionale di Fisica Nucleare (INFN); Universita degli Studi di Bari Aldo Moro; Politecnico di Bari; University of Bologna; University of Catania; University of Florence; University of Genoa; University of Milano-Bicocca; University of Naples Federico II; University of Basilicata; Guglielmo Marconi University; University of Padua; University of Trento; University of Pavia; University of Perugia; University of Pisa; Scuola Normale Superiore di Pisa; Sapienza University Rome; University of Turin; University of Eastern Piedmont Amedeo Avogadro; University of Trieste; Kangwon National University; Kyungpook National University; Chonnam National University; Korea University; University of Seoul; Sungkyunkwan University (SKKU); Vilnius University; Instituto Politecnico Nacional - Mexico; Universidad Iberoamericana Ciudad de Mexico; Benemerita Universidad Autonoma de Puebla; Universidad Autonoma de San Luis Potosi; University of Auckland; University of Canterbury; National Centre for Physics - Pakistan; Quaid I Azam University; National Centre for Nuclear Research; University of Warsaw; Laboratorio de Instrumentacao e Fisica Experimental de Particulas; Joint Institute for Nuclear Research - Russia; National Research Centre - Kurchatov Institute; Petersburg Nuclear Physics Institute; Russian Academy of Sciences; Institute for Nuclear Research of the Russian Academy of Sciences; Alikhanov Institute for Theoretical & Experimental Physics; Russian Academy of Science Lebedev Physical Institute; Lomonosov Moscow State University; Institute of High Energy Physics - IHEP; University of Belgrade; Centro de Investigaciones Energeticas, Medioambientales Tecnologicas; Autonomous University of Madrid; University of Oviedo; Consejo Superior de Investigaciones Cientificas (CSIC); Universidad de Cantabria; CSIC - Instituto de Fisica de Cantabria (IFCA); Swiss Federal Institutes of Technology Domain; Paul Scherrer Institute; ETH Zurich; University of Zurich; National Central University; National Taiwan University; Chulalongkorn University; Cukurova University; Middle East Technical University; Bogazici University; Istanbul Technical University; Kharkov Institute of Physics & Technology; University of Bristol; UK Research & Innovation (UKRI); Science & Technology Facilities Council (STFC); STFC Rutherford Appleton Laboratory; Imperial College London; Brunel University; Baylor University; University of Alabama Tuscaloosa; Boston University; Brown University; University of California Davis; University of California Los Angeles; University of California Riverside; University of California San Diego; University of California Santa Barbara; California Institute of Technology; Carnegie Mellon University; University of Colorado Boulder; Cornell University; Fairfield University; United States Department of Energy (DOE); University of Chicago; Fermi National Accelerator Laboratory; University of Florida; Florida International University; Florida State University; Florida Institute of Technology; University of Illinois Chicago; University of Iowa; Johns Hopkins University; University of Kansas; Kansas State University; Lawrence Livermore National Laboratory; University of Maryland College Park; Massachusetts Institute of Technology (MIT); University of Minnesota Twin Cities; University of Mississippi; University of Nebraska Lincoln; State University of New York (SUNY) Buffalo; Northeastern University; Northwestern University; University of Notre Dame; Ohio State University; Princeton University; University of Puerto Rico; University of Puerto Rico Mayaguez; Purdue University West Lafayette Campus; Purdue University; Rice University; University of Rochester; Rockefeller University; Rutgers State University New Brunswick; University of Tennessee Knoxville; Texas A&M University College Station; Texas Tech University; Vanderbilt University; University of Virginia; Wayne State University; University of Wisconsin Madison; Technische Universitat Wien; Universidade Estadual de Campinas; Suez Canal University; Cairo University; Fayoum University; Helwan University; British University in Egypt; Brandenburg University of Technology Cottbus; Eotvos Lorand University; Visva Bharati University; Sharif University of Technology; Isfahan University of Technology; Islamic Azad University; University of Siena; University of Bern; Gaziosmanpasa University; Adiyaman University; Mersin University; Izmir Institute of Technology; Ozyegin University; Kafkas University; Suleyman Demirel University; Ege University; Mimar Sinan Guzel Sanatlar University; Kahramanmaras Sutcu Imam University; University of Southampton; Utah Valley University; Argonne National Laboratory; Erzincan Binali Yildirim University; Yildiz Technical University; University of Delhi
A search for a standard-model-like Higgs boson in the H -> WW and H -> ZZ decay channels is reported, for Higgs boson masses in the range 145 < m(H) < 1000 GeV. The search is based upon proton-proton collision data samples corresponding to an integrated luminosity of up to 5.1 fb(-1) at root s = 7 TeV and up to 5.3 fb(-1) at root s = 8 TeV, recorded by the CMS experiment at the LHC. The combined upper limits at 95 % confidence level on products of the cross section and branching fractions exclude a standard-model-like Higgs boson in the range 145 < m(H) < 710 GeV, thus extending the mass region excluded by CMS from 127-600 GeV up to 710 GeV.
Measurement of masses in the t(t)over-tilde system by kinematic endpoints in pp collisions at root s=7 TeV
(Springer, 2013) CMS Collaboration; Yerevan Physics Institute; Belarusian State University; National Center of Particles & High Energy Physics - Belarus; University of Antwerp; Vrije Universiteit Brussel; Universite Libre de Bruxelles; Ghent University; Universite Catholique Louvain; University of Mons; Centro Brasileiro de Pesquisas Fisicas; Universidade do Estado do Rio de Janeiro; Universidade Federal do ABC (UFABC); Universidade Estadual Paulista; Bulgarian Academy of Sciences; University of Sofia; Chinese Academy of Sciences; Institute of High Energy Physics, CAS; Peking University; Universidad de los Andes (Colombia); University of Split; Rudjer Boskovic Institute; University of Cyprus; Charles University Prague; Egyptian Academy of Scientific Research & Technology (ASRT); Egyptian Knowledge Bank (EKB); Egyptian Network of High Energy Physics (ENHEP); National Institute of Chemical Physics & Biophysics (NICPB); University of Helsinki; Lappeenranta University of Technology; CEA; UDICE-French Research Universities; Universite Paris Saclay; Centre National de la Recherche Scientifique (CNRS); CNRS - National Institute of Nuclear and Particle Physics (IN2P3); Institut Polytechnique de Paris; Universites de Strasbourg Etablissements Associes; Universite de Haute-Alsace (UHA); Universite de Strasbourg; Universite Claude Bernard Lyon 1; Ivane Javakhishvili Tbilisi State University; RWTH Aachen University; Helmholtz Association; Deutsches Elektronen-Synchrotron (DESY); University of Hamburg; Karlsruhe Institute of Technology; National Centre of Scientific Research "Demokritos"; National & Kapodistrian University of Athens; University of Ioannina; Eotvos Lorand Research Network; Hungarian Academy of Sciences; Hungarian Wigner Research Centre for Physics; Hungarian Institute for Nuclear Research; University of Debrecen; Panjab University; University of Delhi; Saha Institute of Nuclear Physics; Bhabha Atomic Research Center (BARC); Tata Institute of Fundamental Research (TIFR); University College Dublin; Universita degli Studi di Bari Aldo Moro; Politecnico di Bari; Istituto Nazionale di Fisica Nucleare (INFN); University of Bologna; University of Catania; University of Florence; University of Genoa; University of Milano-Bicocca; University of Naples Federico II; University of Basilicata; Guglielmo Marconi University; University of Padua; University of Trento; University of Pavia; University of Perugia; University of Pisa; Scuola Normale Superiore di Pisa; Sapienza University Rome; University of Turin; University of Eastern Piedmont Amedeo Avogadro; University of Trieste; Kangwon National University; Kyungpook National University; Chonnam National University; Korea University; University of Seoul; Sungkyunkwan University (SKKU); Vilnius University; Universidad Iberoamericana Ciudad de Mexico; Benemerita Universidad Autonoma de Puebla; Universidad Autonoma de San Luis Potosi; University of Auckland; University of Canterbury; Quaid I Azam University; National Centre for Physics - Pakistan; National Centre for Nuclear Research; University of Warsaw; Laboratorio de Instrumentacao e Fisica Experimental de Particulas; Joint Institute for Nuclear Research - Russia; National Research Centre - Kurchatov Institute; Petersburg Nuclear Physics Institute; Russian Academy of Sciences; Institute for Nuclear Research of the Russian Academy of Sciences; Alikhanov Institute for Theoretical & Experimental Physics; Russian Academy of Science Lebedev Physical Institute; Lomonosov Moscow State University; Institute of High Energy Physics - IHEP; University of Belgrade; Centro de Investigaciones Energeticas, Medioambientales Tecnologicas; Autonomous University of Madrid; University of Oviedo; Consejo Superior de Investigaciones Cientificas (CSIC); Universidad de Cantabria; CSIC - Instituto de Fisica de Cantabria (IFCA); European Organization for Nuclear Research (CERN); Swiss Federal Institutes of Technology Domain; Paul Scherrer Institute; ETH Zurich; University of Zurich; National Central University; National Taiwan University; Chulalongkorn University; Cukurova University; Middle East Technical University; Bogazici University; Istanbul Technical University; Kharkov Institute of Physics & Technology; University of Bristol; UK Research & Innovation (UKRI); Science & Technology Facilities Council (STFC); STFC Rutherford Appleton Laboratory; Imperial College London; Brunel University; Baylor University; University of Alabama Tuscaloosa; Boston University; Brown University; University of California Davis; University of California Los Angeles; University of California San Diego; University of California Santa Barbara; California Institute of Technology; Carnegie Mellon University; University of Colorado Boulder; Cornell University; Fairfield University; United States Department of Energy (DOE); University of Chicago; Fermi National Accelerator Laboratory; University of Florida; Florida International University; Florida State University; Florida Institute of Technology; University of Illinois Chicago; University of Illinois Chicago Hospital; University of Iowa; Johns Hopkins University; University of Kansas; Kansas State University; Lawrence Livermore National Laboratory; University of Maryland College Park; Massachusetts Institute of Technology (MIT); University of Minnesota Twin Cities; University of Mississippi; University of Nebraska Lincoln; State University of New York (SUNY) Buffalo; Northeastern University; Northwestern University; University of Notre Dame; Ohio State University; Princeton University; University of Puerto Rico; University of Puerto Rico Mayaguez; Purdue University West Lafayette Campus; Purdue University; Rice University; University of Rochester; Rockefeller University; Rutgers State University New Brunswick; University of Tennessee Knoxville; Texas A&M University College Station; Texas Tech University; Vanderbilt University; University of Virginia; Wayne State University; University of Wisconsin Madison; Technische Universitat Wien; Universidade Estadual de Campinas; Suez Canal University; Cairo University; Fayoum University; Helwan University; British University in Egypt; Ain Shams University; Brandenburg University of Technology Cottbus; Eotvos Lorand University; King Abdulaziz University; Visva Bharati University; Sharif University of Technology; Isfahan University of Technology; Islamic Azad University; University of Siena; University of Bern; Gaziosmanpasa University; Adiyaman University; Mersin University; Izmir Institute of Technology; Ozyegin University; Kafkas University; Suleyman Demirel University; Ege University; Mimar Sinan Guzel Sanatlar University; Kahramanmaras Sutcu Imam University; University of Southampton; Utah Valley University; Argonne National Laboratory; Erzincan Binali Yildirim University; Yildiz Technical University
A simultaneous measurement of the top-quark, W-boson, and neutrino masses is reported for t (t) over bar events selected in the dilepton final state from a data sample corresponding to an integrated luminosity of 5.0 fb(-1) collected by the CMS experiment in pp collisions at root s = 7 TeV. The analysis is based on endpoint determinations in kinematic distributions. When the neutrino and W-boson masses are constrained to their world-average values, a top-quark mass value of M-t = 173.9 +/- 0.9 (stat.)=(+ 1.7)(-2.1) (syst.) GeV is obtained. When such constraints are not used, the three particle masses are obtained in a simultaneous fit. In this unconstrained mode the study serves as a test of mass determination methods that may be used in beyond standard model physics scenarios where several masses in a decay chain may be unknown and undetected particles lead to underconstrained kinematics.
Search for physics beyond the standard model in events with tau leptons, jets, and large transverse momentum imbalance in pp collisions at root s=7 TeV
(Springer, 2013) CMS Collaboration; Yerevan Physics Institute; Belarusian State University; National Center of Particles & High Energy Physics - Belarus; University of Antwerp; Vrije Universiteit Brussel; Universite Libre de Bruxelles; Ghent University; Universite Catholique Louvain; University of Mons; Centro Brasileiro de Pesquisas Fisicas; Universidade do Estado do Rio de Janeiro; Universidade Estadual Paulista; Universidade Federal do ABC (UFABC); Bulgarian Academy of Sciences; University of Sofia; Chinese Academy of Sciences; Institute of High Energy Physics, CAS; Peking University; Universidad de los Andes (Colombia); University of Split; Rudjer Boskovic Institute; University of Cyprus; Charles University Prague; Egyptian Academy of Scientific Research & Technology (ASRT); Egyptian Knowledge Bank (EKB); Egyptian Network of High Energy Physics (ENHEP); National Institute of Chemical Physics & Biophysics (NICPB); University of Helsinki; Lappeenranta University of Technology; UDICE-French Research Universities; Universite Paris Saclay; CEA; Institut Polytechnique de Paris; Centre National de la Recherche Scientifique (CNRS); CNRS - National Institute of Nuclear and Particle Physics (IN2P3); Universites de Strasbourg Etablissements Associes; Universite de Haute-Alsace (UHA); Universite de Strasbourg; Universite Claude Bernard Lyon 1; Ivane Javakhishvili Tbilisi State University; RWTH Aachen University; Helmholtz Association; Deutsches Elektronen-Synchrotron (DESY); University of Hamburg; Karlsruhe Institute of Technology; National & Kapodistrian University of Athens; University of Ioannina; Eotvos Lorand Research Network; Hungarian Academy of Sciences; Hungarian Wigner Research Centre for Physics; Hungarian Institute for Nuclear Research; University of Debrecen; Panjab University; University of Delhi; Saha Institute of Nuclear Physics; Bhabha Atomic Research Center (BARC); Tata Institute of Fundamental Research (TIFR); Istituto Nazionale di Fisica Nucleare (INFN); Universita degli Studi di Bari Aldo Moro; Politecnico di Bari; University of Bologna; University of Catania; University of Florence; University of Genoa; University of Milano-Bicocca; University of Naples Federico II; University of Basilicata; Guglielmo Marconi University; University of Padua; University of Trento; University of Pavia; University of Perugia; University of Pisa; Scuola Normale Superiore di Pisa; Sapienza University Rome; University of Turin; University of Eastern Piedmont Amedeo Avogadro; University of Trieste; Kangwon National University; Kyungpook National University; Chonnam National University; Korea University; University of Seoul; Sungkyunkwan University (SKKU); Vilnius University; Instituto Politecnico Nacional - Mexico; Universidad Iberoamericana Ciudad de Mexico; Benemerita Universidad Autonoma de Puebla; Universidad Autonoma de San Luis Potosi; University of Auckland; University of Canterbury; Quaid I Azam University; National Centre for Physics - Pakistan; National Centre for Nuclear Research; University of Warsaw; Laboratorio de Instrumentacao e Fisica Experimental de Particulas; Joint Institute for Nuclear Research - Russia; National Research Centre - Kurchatov Institute; Petersburg Nuclear Physics Institute; Russian Academy of Sciences; Institute for Nuclear Research of the Russian Academy of Sciences; Alikhanov Institute for Theoretical & Experimental Physics; Russian Academy of Science Lebedev Physical Institute; Lomonosov Moscow State University; Institute of High Energy Physics - IHEP; University of Belgrade; Centro de Investigaciones Energeticas, Medioambientales Tecnologicas; Autonomous University of Madrid; University of Oviedo; Consejo Superior de Investigaciones Cientificas (CSIC); Universidad de Cantabria; CSIC - Instituto de Fisica de Cantabria (IFCA); European Organization for Nuclear Research (CERN); Swiss Federal Institutes of Technology Domain; Paul Scherrer Institute; ETH Zurich; University of Zurich; National Central University; National Taiwan University; Chulalongkorn University; Cukurova University; Middle East Technical University; Bogazici University; Istanbul Technical University; Kharkov Institute of Physics & Technology; University of Bristol; UK Research & Innovation (UKRI); Science & Technology Facilities Council (STFC); STFC Rutherford Appleton Laboratory; Imperial College London; Brunel University; Baylor University; University of Alabama Tuscaloosa; Boston University; Brown University; University of California Davis; University of California Los Angeles; University of California Riverside; University of California San Diego; University of California Santa Barbara; California Institute of Technology; Carnegie Mellon University; University of Colorado Boulder; Cornell University; Fairfield University; United States Department of Energy (DOE); University of Chicago; Fermi National Accelerator Laboratory; University of Florida; Florida International University; Florida State University; Florida Institute of Technology; University of Illinois Chicago; University of Iowa; Johns Hopkins University; University of Kansas; Kansas State University; Lawrence Livermore National Laboratory; University of Maryland College Park; Massachusetts Institute of Technology (MIT); University of Minnesota Twin Cities; University of Mississippi; University of Nebraska Lincoln; State University of New York (SUNY) Buffalo; Northeastern University; Northwestern University; University of Notre Dame; Ohio State University; Princeton University; University of Puerto Rico; University of Puerto Rico Mayaguez; Purdue University; Purdue University West Lafayette Campus; Rice University; University of Rochester; Rockefeller University; Rutgers State University New Brunswick; University of Tennessee Knoxville; Texas A&M University College Station; Texas Tech University; Vanderbilt University; University of Virginia; Wayne State University; University of Wisconsin Madison; Technische Universitat Wien; Suez Canal University; Zewail City of Science & Technology; Cairo University; Fayoum University; British University in Egypt; Brandenburg University of Technology Cottbus; Eotvos Lorand University; Visva Bharati University; Sharif University of Technology; Isfahan University of Technology; Islamic Azad University; University of Siena; University of Bucharest; Gaziosmanpasa University; Adiyaman University; Izmir Institute of Technology; Mersin University; Ozyegin University; Kafkas University; Suleyman Demirel University; Ege University; University of Southampton; University of Sydney; Utah Valley University; Argonne National Laboratory; Erzincan Binali Yildirim University; Mimar Sinan Guzel Sanatlar University
A search for physics beyond the standard model is performed with events having one or more hadronically decaying tau leptons, highly energetic jets, and large transverse momentum imbalance. The data sample corresponds to an integrated luminosity of 4.98 fb(-1) of proton-proton collisions at root s = 7 TeV collected with the CMS detector at the LHC in 2011. The number of observed events is consistent with predictions for standard model processes. Lower limits on the mass of the gluino in supersymmetric models are determined.
Search for supersymmetry in hadronic final states with missing transverse energy using the variables alpha(T) and b-quark multiplicity in pp collisions at root s=8 TeV
(Springer, 2013) CMS Collaboration; Yerevan Physics Institute; Belarusian State University; National Center of Particles & High Energy Physics - Belarus; University of Antwerp; Vrije Universiteit Brussel; Universite Libre de Bruxelles; Ghent University; Universite Catholique Louvain; University of Mons; Centro Brasileiro de Pesquisas Fisicas; Universidade do Estado do Rio de Janeiro; Universidade Estadual Paulista; Universidade Federal do ABC (UFABC); Bulgarian Academy of Sciences; University of Sofia; Chinese Academy of Sciences; Institute of High Energy Physics, CAS; Peking University; Universidad de los Andes (Colombia); University of Split; Rudjer Boskovic Institute; University of Cyprus; Charles University Prague; Egyptian Academy of Scientific Research & Technology (ASRT); Egyptian Knowledge Bank (EKB); Egyptian Network of High Energy Physics (ENHEP); National Institute of Chemical Physics & Biophysics (NICPB); University of Helsinki; Lappeenranta University of Technology; CEA; UDICE-French Research Universities; Universite Paris Saclay; Institut Polytechnique de Paris; Centre National de la Recherche Scientifique (CNRS); CNRS - National Institute of Nuclear and Particle Physics (IN2P3); Universites de Strasbourg Etablissements Associes; Universite de Strasbourg; Universite de Haute-Alsace (UHA); Universite Claude Bernard Lyon 1; Ivane Javakhishvili Tbilisi State University; RWTH Aachen University; Helmholtz Association; Deutsches Elektronen-Synchrotron (DESY); University of Hamburg; Karlsruhe Institute of Technology; National Centre of Scientific Research "Demokritos"; National & Kapodistrian University of Athens; University of Ioannina; Eotvos Lorand Research Network; Hungarian Academy of Sciences; Hungarian Wigner Research Centre for Physics; Hungarian Institute for Nuclear Research; University of Debrecen; Panjab University; University of Delhi; Saha Institute of Nuclear Physics; Bhabha Atomic Research Center (BARC); Tata Institute of Fundamental Research (TIFR); Istituto Nazionale di Fisica Nucleare (INFN); Universita degli Studi di Bari Aldo Moro; Politecnico di Bari; University of Bologna; University of Catania; University of Florence; University of Genoa; University of Milano-Bicocca; University of Naples Federico II; University of Basilicata; Guglielmo Marconi University; University of Padua; University of Trento; University of Pavia; University of Perugia; University of Pisa; Scuola Normale Superiore di Pisa; Sapienza University Rome; University of Turin; University of Eastern Piedmont Amedeo Avogadro; University of Trieste; Kangwon National University; Kyungpook National University; Chonnam National University; Korea University; University of Seoul; Sungkyunkwan University (SKKU); Vilnius University; Instituto Politecnico Nacional - Mexico; Universidad Iberoamericana Ciudad de Mexico; Benemerita Universidad Autonoma de Puebla; Universidad Autonoma de San Luis Potosi; University of Auckland; University of Canterbury; National Centre for Physics - Pakistan; Quaid I Azam University; National Centre for Nuclear Research; University of Warsaw; Laboratorio de Instrumentacao e Fisica Experimental de Particulas; Joint Institute for Nuclear Research - Russia; National Research Centre - Kurchatov Institute; Petersburg Nuclear Physics Institute; Russian Academy of Sciences; Institute for Nuclear Research of the Russian Academy of Sciences; Alikhanov Institute for Theoretical & Experimental Physics; Russian Academy of Science Lebedev Physical Institute; Lomonosov Moscow State University; Institute of High Energy Physics - IHEP; University of Belgrade; Centro de Investigaciones Energeticas, Medioambientales Tecnologicas; Autonomous University of Madrid; University of Oviedo; Consejo Superior de Investigaciones Cientificas (CSIC); Universidad de Cantabria; CSIC - Instituto de Fisica de Cantabria (IFCA); European Organization for Nuclear Research (CERN); Swiss Federal Institutes of Technology Domain; Paul Scherrer Institute; ETH Zurich; University of Zurich; National Central University; National Taiwan University; Chulalongkorn University; Cukurova University; Middle East Technical University; Bogazici University; Istanbul Technical University; Kharkov Institute of Physics & Technology; University of Bristol; UK Research & Innovation (UKRI); Science & Technology Facilities Council (STFC); STFC Rutherford Appleton Laboratory; Imperial College London; Brunel University; Baylor University; University of Alabama Tuscaloosa; Boston University; Brown University; University of California Davis; University of California Los Angeles; University of California Riverside; University of California San Diego; University of California Santa Barbara; California Institute of Technology; Carnegie Mellon University; University of Colorado Boulder; Cornell University; Fairfield University; United States Department of Energy (DOE); University of Chicago; Fermi National Accelerator Laboratory; University of Florida; Florida International University; Florida State University; Florida Institute of Technology; University of Illinois Chicago; University of Illinois Chicago Hospital; University of Iowa; Johns Hopkins University; University of Kansas; Kansas State University; Lawrence Livermore National Laboratory; University of Maryland College Park; Massachusetts Institute of Technology (MIT); University of Minnesota Twin Cities; University of Mississippi; University of Nebraska Lincoln; State University of New York (SUNY) Buffalo; Northeastern University; Northwestern University; University of Notre Dame; Ohio State University; Princeton University; University of Puerto Rico; University of Puerto Rico Mayaguez; Purdue University West Lafayette Campus; Purdue University; Rice University; University of Rochester; Rockefeller University; Rutgers State University New Brunswick; University of Tennessee Knoxville; Texas A&M University College Station; Texas Tech University; Vanderbilt University; University of Virginia; Wayne State University; University of Wisconsin Madison; Technische Universitat Wien; Universidade Estadual de Campinas; Suez Canal University; Cairo University; Fayoum University; British University in Egypt; Brandenburg University of Technology Cottbus; Eotvos Lorand University; Visva Bharati University; Sharif University of Technology; Isfahan University of Technology; Islamic Azad University; University of Siena; University of Bern; Gaziosmanpasa University; Adiyaman University; Mersin University; Izmir Institute of Technology; Ozyegin University; Kafkas University; Suleyman Demirel University; Ege University; Mimar Sinan Guzel Sanatlar University; Kahramanmaras Sutcu Imam University; University of Southampton; Utah Valley University; Argonne National Laboratory; Erzincan Binali Yildirim University; Yildiz Technical University
An inclusive search for supersymmetric processes that produce final states with jets and missing transverse energy is performed in pp collisions at a centre-of-mass energy of 8 TeV. The data sample corresponds to an integrated luminosity of 11.7 fb(-1) collected by the CMS experiment at the LHC. In this search, a dimensionless kinematic variable, alpha(T), is used to discriminate between events with genuine and misreconstructed missing transverse energy. The search is based on an examination of the number of reconstructed jets per event, the scalar sum of transverse energies of these jets, and the number of these jets identified as originating from bottom quarks. No significant excess of events over the standard model expectation is found. Exclusion limits are set in the parameter space of simplified models, with a special emphasis on both compressed-spectrum scenarios and direct or gluino-induced production of third-generation squarks. For the case of gluino-mediated squark production, gluino masses up to 950-1125 GeV are excluded depending on the assumed model. For the direct pair-production of squarks, masses up to 450 GeV are excluded for a single light first-or second-generation squark, increasing to 600 GeV for bottom squarks.
Direct transfer of graphene onto flexible substrates
(National Academy of the Sciences, 2013) Martins, Luiz G. P.; Song, Yi; Zeng, Tingying; Dresselhaus, Mildred S.; Kong, Jing; Araujo, Paulo T.; Universidade Federal de Minas Gerais; Massachusetts Institute of Technology (MIT); University of Alabama Tuscaloosa
In this paper we explore the direct transfer via lamination of chemical vapor deposition graphene onto different flexible substrates. The transfer method investigated here is fast, simple, and does not require an intermediate transfer membrane, such as polymethylmethacrylate, which needs to be removed afterward. Various substrates of general interest in research and industry were studied in this work, including polytetrafluoroethylene filter membranes, PVC, cellulose nitrate/cellulose acetate filter membranes, polycarbonate, paraffin, polyethylene terephthalate, paper, and cloth. By comparing the properties of these substrates, two critical factors to ensure a successful transfer on bare substrates were identified: the substrate's hydrophobicity and good contact between the substrate and graphene. For substrates that do not satisfy those requirements, polymethylmethacrylate can be used as a surface modifier or glue to ensure successful transfer. Our results can be applied to facilitate current processes and open up directions for applications of chemical vapor deposition graphene on flexible substrates. A broad range of applications can be envisioned, including fabrication of graphene devices for opto/organic electronics, graphene membranes for gas/liquid separation, and ubiquitous electronics with graphene.
Jet and underlying event properties as a function of charged-particle multiplicity in proton-proton collisions at root s=7 TeV
(Springer, 2013) CMS Collaboration; Yerevan Physics Institute; Belarusian State University; National Center of Particles & High Energy Physics - Belarus; University of Antwerp; Vrije Universiteit Brussel; Universite Libre de Bruxelles; Ghent University; Universite Catholique Louvain; University of Mons; Centro Brasileiro de Pesquisas Fisicas; Universidade do Estado do Rio de Janeiro; Universidade Estadual Paulista; Universidade Federal do ABC (UFABC); Bulgarian Academy of Sciences; University of Sofia; Chinese Academy of Sciences; Institute of High Energy Physics, CAS; Peking University; Universidad de los Andes (Colombia); University of Split; Rudjer Boskovic Institute; University of Cyprus; Charles University Prague; Egyptian Academy of Scientific Research & Technology (ASRT); Egyptian Knowledge Bank (EKB); Egyptian Network of High Energy Physics (ENHEP); National Institute of Chemical Physics & Biophysics (NICPB); University of Helsinki; Lappeenranta University of Technology; UDICE-French Research Universities; Universite Paris Saclay; CEA; Centre National de la Recherche Scientifique (CNRS); CNRS - National Institute of Nuclear and Particle Physics (IN2P3); Institut Polytechnique de Paris; Universites de Strasbourg Etablissements Associes; Universite de Haute-Alsace (UHA); Universite de Strasbourg; Universite Claude Bernard Lyon 1; Ivane Javakhishvili Tbilisi State University; RWTH Aachen University; Helmholtz Association; Deutsches Elektronen-Synchrotron (DESY); University of Hamburg; Karlsruhe Institute of Technology; National Centre of Scientific Research "Demokritos"; National & Kapodistrian University of Athens; University of Ioannina; Eotvos Lorand Research Network; Hungarian Academy of Sciences; Hungarian Wigner Research Centre for Physics; Hungarian Institute for Nuclear Research; University of Debrecen; National Institute of Science Education & Research (NISER); Panjab University; University of Delhi; Saha Institute of Nuclear Physics; Bhabha Atomic Research Center (BARC); Tata Institute of Fundamental Research (TIFR); University College Dublin; Istituto Nazionale di Fisica Nucleare (INFN); Universita degli Studi di Bari Aldo Moro; Politecnico di Bari; University of Bologna; University of Catania; University of Florence; University of Genoa; University of Milano-Bicocca; University of Naples Federico II; University of Basilicata; Guglielmo Marconi University; University of Padua; University of Trento; University of Pavia; University of Perugia; University of Pisa; Scuola Normale Superiore di Pisa; Sapienza University Rome; University of Turin; University of Eastern Piedmont Amedeo Avogadro; University of Trieste; Kangwon National University; Kyungpook National University; Chonnam National University; Korea University; University of Seoul; Sungkyunkwan University (SKKU); Vilnius University; Instituto Politecnico Nacional - Mexico; Benemerita Universidad Autonoma de Puebla; Universidad Autonoma de San Luis Potosi; University of Auckland; University of Canterbury; Quaid I Azam University; National Centre for Physics - Pakistan; National Centre for Nuclear Research; University of Warsaw; Laboratorio de Instrumentacao e Fisica Experimental de Particulas; Joint Institute for Nuclear Research - Russia; National Research Centre - Kurchatov Institute; Petersburg Nuclear Physics Institute; Russian Academy of Sciences; Institute for Nuclear Research of the Russian Academy of Sciences; Alikhanov Institute for Theoretical & Experimental Physics; Russian Academy of Science Lebedev Physical Institute; Lomonosov Moscow State University; Institute of High Energy Physics - IHEP; University of Belgrade; Centro de Investigaciones Energeticas, Medioambientales Tecnologicas; Autonomous University of Madrid; University of Oviedo; Consejo Superior de Investigaciones Cientificas (CSIC); Universidad de Cantabria; CSIC - Instituto de Fisica de Cantabria (IFCA); European Organization for Nuclear Research (CERN); Swiss Federal Institutes of Technology Domain; Paul Scherrer Institute; ETH Zurich; University of Zurich; National Central University; National Taiwan University; Chulalongkorn University; Cukurova University; Middle East Technical University; Bogazici University; Istanbul Technical University; Kharkov Institute of Physics & Technology; University of Bristol; UK Research & Innovation (UKRI); Science & Technology Facilities Council (STFC); STFC Rutherford Appleton Laboratory; Imperial College London; Brunel University; Baylor University; University of Alabama Tuscaloosa; Boston University; Brown University; University of California Davis; University of California Los Angeles; University of California Riverside; University of California San Diego; University of California Santa Barbara; California Institute of Technology; Carnegie Mellon University; University of Colorado Boulder; Cornell University; Fairfield University; United States Department of Energy (DOE); University of Chicago; Fermi National Accelerator Laboratory; University of Florida; Florida International University; Florida State University; Florida Institute of Technology; University of Illinois Chicago; University of Illinois Chicago Hospital; University of Iowa; Johns Hopkins University; University of Kansas; Kansas State University; Lawrence Livermore National Laboratory; University of Maryland College Park; Massachusetts Institute of Technology (MIT); University of Minnesota Twin Cities; University of Mississippi; University of Nebraska Lincoln; State University of New York (SUNY) Buffalo; Northeastern University; Northwestern University; University of Notre Dame; Ohio State University; Princeton University; University of Puerto Rico; University of Puerto Rico Mayaguez; Purdue University West Lafayette Campus; Purdue University; Rice University; University of Rochester; Rockefeller University; Rutgers State University New Brunswick; University of Tennessee Knoxville; Texas A&M University College Station; Texas Tech University; Vanderbilt University; University of Virginia; Wayne State University; University of Wisconsin Madison; Technische Universitat Wien; Universidade Estadual de Campinas; Zewail City of Science & Technology; Suez Canal University; Cairo University; Fayoum University; British University in Egypt; Brandenburg University of Technology Cottbus; Eotvos Lorand University; Visva Bharati University; University Ruhuna; Isfahan University of Technology; Sharif University of Technology; Islamic Azad University; University of Siena; Universidad Michoacana de San Nicolas de Hidalgo; University of Bern; Gaziosmanpasa University; Adiyaman University; Cag University - Turkey; Mersin University; Izmir Institute of Technology; Ozyegin University; Kafkas University; Suleyman Demirel University; Ege University; Mimar Sinan Guzel Sanatlar University; Kahramanmaras Sutcu Imam University; University of Southampton; Utah Valley University; Argonne National Laboratory; Erzincan Binali Yildirim University; Yildiz Technical University; Qatar Foundation (QF); Texas A&M University Qatar
Characteristics of multi-particle production in proton-proton collisions at root s = 7 TeV are studied as a function of the charged-particle multiplicity, N (ch). The produced particles are separated into two classes: those belonging to jets and those belonging to the underlying event. Charged particles are measured with pseudorapidity |eta|< 2.4 and transverse momentum p (T)> 0.25 GeV/c. Jets are reconstructed from charged-particles only and required to have p (T)> 5 GeV/c. The distributions of jet p (T), average p (T) of charged particles belonging to the underlying event or to jets, jet rates, and jet shapes are presented as functions of N (ch) and compared to the predictions of the pythia and herwig event generators. Predictions without multi-parton interactions fail completely to describe the N (ch)-dependence observed in the data. For increasing N (ch), pythia systematically predicts higher jet rates and harder p (T) spectra than seen in the data, whereas herwig shows the opposite trends. At the highest multiplicity, the data-model agreement is worse for most observables, indicating the need for further tuning and/or new model ingredients.
Measurement of prompt and nonprompt J/psi production in pp and pPb collisions at root s(NN)=5.02 TeV
(Springer, 2017) CMS Collaboration; Yerevan Physics Institute; Belarusian State University; National Center of Particles & High Energy Physics - Belarus; University of Antwerp; Vrije Universiteit Brussel; Universite Libre de Bruxelles; Ghent University; Universite Catholique Louvain; University of Mons; Centro Brasileiro de Pesquisas Fisicas; Universidade do Estado do Rio de Janeiro; Universidade Estadual Paulista; Universidade Federal do ABC (UFABC); Bulgarian Academy of Sciences; University of Sofia; Beihang University; Chinese Academy of Sciences; Institute of High Energy Physics, CAS; Peking University; Universidad de los Andes (Colombia); University of Split; University of Cyprus; Charles University Prague; Egyptian Academy of Scientific Research & Technology (ASRT); Egyptian Knowledge Bank (EKB); Egyptian Network of High Energy Physics (ENHEP); National Institute of Chemical Physics & Biophysics (NICPB); University of Helsinki; Lappeenranta University of Technology; UDICE-French Research Universities; Universite Paris Saclay; CEA; Centre National de la Recherche Scientifique (CNRS); CNRS - National Institute of Nuclear and Particle Physics (IN2P3); Institut Polytechnique de Paris; Universites de Strasbourg Etablissements Associes; Universite de Strasbourg; Georgian Technical University; Ivane Javakhishvili Tbilisi State University; RWTH Aachen University; Helmholtz Association; Deutsches Elektronen-Synchrotron (DESY); University of Hamburg; Karlsruhe Institute of Technology; National Centre of Scientific Research "Demokritos"; National & Kapodistrian University of Athens; University of Ioannina; Eotvos Lorand University; Eotvos Lorand Research Network; Hungarian Academy of Sciences; Hungarian Wigner Research Centre for Physics; Hungarian Institute for Nuclear Research; University of Debrecen; Indian Institute of Science (IISC) - Bangalore; National Institute of Science Education & Research (NISER); Panjab University; University of Delhi; Saha Institute of Nuclear Physics; Indian Institute of Technology (IIT) - Madras; Bhabha Atomic Research Center (BARC); Tata Institute of Fundamental Research (TIFR); Indian Institute of Science Education & Research (IISER) Pune; University College Dublin; Istituto Nazionale di Fisica Nucleare (INFN); Universita degli Studi di Bari Aldo Moro; Politecnico di Bari; University of Bologna; University of Catania; University of Florence; University of Genoa; University of Milano-Bicocca; University of Naples Federico II; University of Basilicata; Guglielmo Marconi University; University of Padua; University of Trento; University of Pavia; University of Perugia; University of Pisa; Scuola Normale Superiore di Pisa; Sapienza University Rome; University of Turin; University of Eastern Piedmont Amedeo Avogadro; University of Trieste; Kyungpook National University; Jeonbuk National University; Chonnam National University; Hanyang University; Korea University; Seoul National University (SNU); University of Seoul; Sungkyunkwan University (SKKU); Vilnius University; Universiti Malaya; Instituto Politecnico Nacional - Mexico; Universidad Iberoamericana Ciudad de Mexico; Benemerita Universidad Autonoma de Puebla; Universidad Autonoma de San Luis Potosi; University of Auckland; University of Canterbury; Quaid I Azam University; National Centre for Physics - Pakistan; National Centre for Nuclear Research; University of Warsaw; Laboratorio de Instrumentacao e Fisica Experimental de Particulas; Joint Institute for Nuclear Research - Russia; National Research Centre - Kurchatov Institute; Petersburg Nuclear Physics Institute; Alikhanov Institute for Theoretical & Experimental Physics; Moscow Institute of Physics & Technology; National Research Nuclear University MEPhI (Moscow Engineering Physics Institute); Russian Academy of Sciences; Russian Academy of Science Lebedev Physical Institute; Lomonosov Moscow State University; Novosibirsk State University; Institute of High Energy Physics - IHEP; University of Belgrade; Centro de Investigaciones Energeticas, Medioambientales Tecnologicas; Autonomous University of Madrid; University of Oviedo; Consejo Superior de Investigaciones Cientificas (CSIC); Universidad de Cantabria; CSIC - Instituto de Fisica de Cantabria (IFCA); European Organization for Nuclear Research (CERN); Swiss Federal Institutes of Technology Domain; Paul Scherrer Institute; ETH Zurich; University of Zurich; National Central University; National Taiwan University; Chulalongkorn University; Cukurova University; Middle East Technical University; Bogazici University; Istanbul Technical University; National Academy of Sciences Ukraine; Institute for Scintillation Materials of the National Academy of Sciences of Ukraine; Kharkov Institute of Physics & Technology; University of Bristol; UK Research & Innovation (UKRI); Science & Technology Facilities Council (STFC); STFC Rutherford Appleton Laboratory; Imperial College London; Brunel University; Baylor University; Catholic University of America; University of Alabama Tuscaloosa; Boston University; Brown University; University of California Davis; University of California Los Angeles; University of California Riverside; University of California San Diego; University of California Santa Barbara; California Institute of Technology; Carnegie Mellon University; University of Colorado Boulder; Cornell University; Fairfield University; United States Department of Energy (DOE); University of Chicago; Fermi National Accelerator Laboratory; University of Florida; Florida International University; Florida State University; Florida Institute of Technology; University of Illinois Chicago; University of Illinois Chicago Hospital; University of Iowa; Johns Hopkins University; University of Kansas; Kansas State University; Lawrence Livermore National Laboratory; University of Maryland College Park; Massachusetts Institute of Technology (MIT); University of Minnesota Twin Cities; University of Mississippi; University of Nebraska Lincoln; State University of New York (SUNY) Buffalo; Northeastern University; Northwestern University; University of Notre Dame; Ohio State University; Princeton University; University of Puerto Rico; University of Puerto Rico Mayaguez; Purdue University West Lafayette Campus; Purdue University; Rice University; University of Rochester; Rutgers State University New Brunswick; University of Tennessee Knoxville; Texas A&M University College Station; Texas Tech University; Vanderbilt University; University of Virginia; Wayne State University; University of Wisconsin Madison; Technische Universitat Wien; Universidade Estadual de Campinas; Universidade Federal de Pelotas; Suez University; British University in Egypt; Ain Shams University; Helwan University; Universite de Haute-Alsace (UHA); Brandenburg University of Technology Cottbus; Indian Institute of Technology (IIT) - Bhubaneswar; Visva Bharati University; Indian Institute of Science Education & Research (IISER) - Bhopal; Institute of Physics Bhubaneswar (IOPB); University Ruhuna; Isfahan University of Technology; University of Yazd; Islamic Azad University; University of Siena; International Islamic University Malaysia; Agensi Nuklear Malaysia; Warsaw University of Technology; Institute for Nuclear Research of the Russian Academy of Sciences; Peter the Great St. Petersburg Polytechnic University; Budker Institute of Nuclear Physics; Riga Technical University; University of Bern; Adiyaman University; Istanbul Aydin University; Mersin University; Cag University - Turkey; Piri Reis University; Gaziosmanpasa University; Ozyegin University; Izmir Institute of Technology; Marmara University; Kafkas University; Istanbul Bilgi University; Yildiz Technical University; Hacettepe University; University of Southampton; Argonne National Laboratory; Erzincan Binali Yildirim University; Mimar Sinan Guzel Sanatlar University; Qatar Foundation (QF); Texas A&M University Qatar
This paper reports the measurement of J/psi meson production in proton proton (pp) and proton lead (pPb) collisions at a center-of-mass energy per nucleon pair of 5.02 TeV by the CMS experiment at the LW. The data samples used in the analysis correspond to integrated luminosities of 28 ph(-1) and 35 nb(-1) for pp and pPb collisions, respectively. Prompt and nonprompt J/psi mesons, the latter produced in the decay of B hadrons, are measured in their dilution decay channels, Differential cross sections are measured in the transverse momentum range of 2 < p(T) < 30 GeV/c, and center-of-mass rapidity ranges of vertical bar y(CM)vertical bar < 2.4 (pp) and -2.87 < y(CM) < 1.93 (pPb). The nuclear modification factor, R-pPb, is measured as a function of both p(T) and y(CM). Small modifications to the J/psi cross sections are observed in pPb relative to pp collisions. The ratio of J/psi production cross sections in p-going and Pb-going directions, R-FB, studied as functions of p(T) and y(CM), shows a significant decrease for increasing transverse energy deposited at large pseudorapidities. These results, which cover a wide kinematic range, provide new insight on the role of cold nuclear matter effects on prompt and nonprompt J/psi production.

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