Transverse momentum spectra of inclusive b jets in pPb collisions atv root s(NN)=5.02 TeV

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We present a measurement of b jet transverse momentum ((p_T)) spectra in proton-lead (pPb) collisions using a dataset corresponding to about 35 nb(^{-1}) collected with the CMS detector at the LHC. Jets from b quark fragmentation are found by exploiting the long lifetime of hadrons containing a b quark through tagging methods using distributions of the secondary vertex mass and displacement. Extracted cross sections for b jets are scaled by the effective number of nucleonânucleon collisions and are compared to a reference obtained from pythia simulations of pp collisions. The pythia-based estimate of the nuclear modification factor is found to be 1.22±0.15(stat+syst pPb)±0.27(syst pythia) averaged over all jets with (p_T) between 55 and 400 GeV/c and with |(\eta_{lab})| < 2. We also compare this result to predictions from models using perturbative calculations in quantum chromodynamics.

CMS, Physics, Heavy ions, b-tagging, QUARK-GLUON PLASMA, HEAVY QUARKS, PERSPECTIVE, Astronomy & Astrophysics, Physics, Nuclear, Physics, Particles & Fields
Khachatryan, V., Sirunyan, A. M., Tumasyan, A., Adam, W., Asilar, E., Bergauer, T., Brandstetter, J., Brondolin, E., Dragicevic, M., Erö, J., Flechl, M., Friedl, M., Frühwirth, R., Ghete, V. M., Hartl, C., Hörmann, N., Hrubec, J., Jeitler, M., Knünz, V., … Woods, N. (2016). Transverse momentum spectra of inclusive b jets in pPb collisions at sNN=5.02 TeV. In Physics Letters B (Vol. 754, pp. 59–80). Elsevier BV.