Measurement of the W gamma Production Cross Section in Proton-Proton Collisions at root s=13 TeV and Constraints on Effective Field Theory Coefficients

Abstract

A fiducial cross section for (W\gamma ) production in proton-proton collisions is measured at a center-of-mass energy of 13 TeV in (137\text{}\text{}{\mathrm{fb}}^{-1}) of data collected using the CMS detector at the LHC. The (W\to e\nu ) and (\mu \nu ) decay modes are used in a maximum-likelihood fit to the lepton-photon invariant mass distribution to extract the combined cross section. The measured cross section is compared with theoretical expectations at next-to-leading order in quantum chromodynamics. In addition, 95% confidence level intervals are reported for anomalous triple-gauge couplings within the framework of effective field theory.

Description
Keywords
Physics, Multidisciplinary, Physics
Citation
Sirunyan, A. M., Tumasyan, A., Adam, W., Andrejkovic, J. W., Bergauer, T., Chatterjee, S., Dragicevic, M., Escalante Del Valle, A., Frühwirth, R., Jeitler, M., Krammer, N., Lechner, L., Liko, D., Mikulec, I., Pitters, F. M., Schieck, J., Schöfbeck, R., Spanring, M., … Templ, S. (2021). Measurement of the Wγ Production Cross Section in Proton-Proton Collisions at s=13  TeV and Constraints on Effective Field Theory Coefficients. In Physical Review Letters (Vol. 126, Issue 25). American Physical Society (APS). https://doi.org/10.1103/physrevlett.126.252002