Measurement of the production cross section for a W boson in association with a charm quark in proton–proton collisions at √s = 13 TeV
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10052_2023_Article_12258.pdf
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6c8bd51fb2cb42018abfef50499d3727
Date Issued
January 10, 2024
Publisher
Springer Berlin Heidelberg
Citation
The European Physical Journal C. 2024 Jan 10;84(1):27
Version
Final published version
Abstract
The 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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1140/epjc/s10052-023-12258-4
