Measurement of the production cross section of a W boson in association with a charm quark in proton-proton collisions at $\sqrt{s}=13~\mathrm{TeV}$

CMS Physics Analysis Summaries
Report number	CMS-PAS-SMP-21-005
Title	Measurement of the production cross section of a W boson in association with a charm quark in proton-proton collisions at $\sqrt{s}=13~\mathrm{TeV}$
Corporate author(s)	CMS Collaboration
Collaboration	CMS Collaboration
Subject category	Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN LHC ; CMS
Abstract	The strange quark content of the proton is probed through the measurement of the production cross section of a W boson and a charm (c) quark in proton-proton collisions at a centre-of-mass energy of 13 TeV. The analysis uses a data sample corresponding to a total integrated luminosity of $138~\mathrm{fb}^{-1}$ collected by the CMS detector at the LHC. W bosons are identified through their leptonic decays to an electron or a muon, and a neutrino. Charm jets are tagged by the presence of a muon or a secondary vertex inside the jet. The $\mathrm{W}\!+\mathrm{c}$ production cross section and the cross section ratio $ \sigma({\rm W^+\! +\bar{c}}) / \sigma({\rm W^-\! +c})$ are measured inclusively and differentially as functions of the transverse momentum and the pseudorapidity of the lepton from the W boson decay. The measurements, with improved precision from previous CMS studies, are compared with theoretical predictions.
Related	superseded by: CERN-EP-2023-105
Email contact: [email protected] Fulltext in PDF Figure_003-a Figure_003-b Figure_009-a Figure_008 Figure_002-a Figure_002-b Figure_006 Figure_005-b Figure_005-a Figure_004 Figure_007-a Figure_009-b Figure_001 Figure_007-b Additional information for the analysis (restricted access)