Measurement of the production cross section for a W boson in association with a charm quark in proton–proton collisions at $$sqrt{s} = 13,hbox {TeV}$$ | CU Experts

AbstractThe strange quark content of the proton is probed through the measurement of the production cross section for a W boson and a charm (c) quark in proton–proton collisions at a center-of-mass energy of 13$$,text {Te}hspace{-.08em}text {V}$$; ; ; Te; ; V; ; . The analysis uses a data sample corresponding to a total integrated luminosity of 138$$,text {fb}^{-1}$$; ; ; ; fb; ; -; 1; ; ; ; collected with the CMS detector at the LHC. The W bosons are identified through their leptonic decays to an electron or a muon, and a neutrino. Charm jets are tagged using the presence of a muon or a secondary vertex inside the jet. The $$hbox {W}+hbox {c}$$; ; W; +; c; ; production cross section and the cross section ratio $$R_textrm{c}^{pm }= sigma ({hbox {W}}^{+}+bar{text {c}})/sigma (hbox {W}^{-}+{textrm{c}})$$; ; ; R; c; ±; ; =; σ; ; (; ; ; W; ; +; ; +; ; ; c; ; ; ¯; ; ; ); ; /; σ; ; (; ; W; -; ; +; c; ); ; ; are measured inclusively and differentially as functions of the transverse momentum and the pseudorapidity of the lepton originating from the W boson decay. The precision of the measurements is improved with respect to previous studies, reaching 1% in $$R_textrm{c}^{pm }= 0.950 pm 0.005,text {(stat)} pm 0.010 ,text {(syst)} $$; ; ; R; c; ±; ; =; 0.950; ±; 0.005; ; (stat); ±; 0.010; ; (syst); ; . The measurements are compared with theoretical predictions up to next-to-next-to-leading order in perturbative quantum chromodynamics.

Tumasyan A; Adam W; Andrejkovic JW; Bergauer T; Chatterjee S; Damanakis K; Dragicevic M; Valle AED; Hussain PS; Jeitler M

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