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Title: Measurement of associated W + charm production in pp collisions at $$\sqrt{s}$$ = 7 TeV

Journal Article · · Journal of High Energy Physics (Online)
 [1]
  1. et al.
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Measurements are presented of the associated production of a W boson and a charm-quark jet (W + c) in pp collisions at a center-of-mass energy of 7 TeV. The analysis is conducted with a data sample corresponding to a total integrated luminosity of 5 inverse femtobarns, collected by the CMS detector at the LHC. W boson candidates are identified by their decay into a charged lepton (muon or electron) and a neutrino. The W + c measurements are performed for charm-quark jets in the kinematic region $$p_T^{jet} \gt$$ 25 GeV, $$|\eta^{jet}| \lt$$ 2.5, for two different thresholds for the transverse momentum of the lepton from the W-boson decay, and in the pseudorapidity range $$|\eta^{\ell}| \lt$$ 2.1. Hadronic and inclusive semileptonic decays of charm hadrons are used to measure the following total cross sections: $$\sigma(pp \to W + c + X) \times B(W \to \ell \nu)$$ = 107.7 +/- 3.3 (stat.) +/- 6.9 (syst.) pb ($$p_T^{\ell} \gt$$ 25 GeV) and $$\sigma(pp \to W + c + X) \times B(W \to \ell \nu)$$ = 84.1 +/- 2.0 (stat.) +/- 4.9 (syst.) pb ($$p_T^{\ell} \gt$$ 35 GeV), and the cross section ratios $$\sigma(pp \to W^+ + \bar{c} + X)/\sigma(pp \to W^- + c + X)$$ = 0.954 +/- 0.025 (stat.) +/- 0.004 (syst.) ($$p_T^{\ell} \gt$$ 25 GeV) and $$\sigma(pp \to W^+ + \bar{c} + X)\sigma(pp \to W^- + c + X)$$ = 0.938 +/- 0.019 (stat.) +/- 0.006 (syst.) ($$p_T^{\ell} \gt$$ 35 GeV). Cross sections and cross section ratios are also measured differentially with respect to the absolute value of the pseudorapidity of the lepton from the W-boson decay. These are the first measurements from the LHC directly sensitive to the strange quark and antiquark content of the proton. Results are compared with theoretical predictions and are consistent with the predictions based on global fits of parton distribution functions.

Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Contributing Organization:
CMS Collaboration
Grant/Contract Number:
AC02-07CH11359
OSTI ID:
1151673
Report Number(s):
FERMILAB-PUB-13-632-CMS; CERN-PH-EP-2013-149; CMS-SMP-12-002; arXiv eprint number arXiv:1310.1138
Journal Information:
Journal of High Energy Physics (Online), Vol. 2014, Issue 2; ISSN 1029-8479
Publisher:
Springer BerlinCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 54 works
Citation information provided by
Web of Science

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Cited By (10)

Parton distributions from nonlocal chiral SU(3) effective theory: Flavor asymmetries journal November 2019
Associated production of electroweak bosons and heavy mesons at LHCb and the prospects to observe double parton interactions journal May 2016
QCD analysis of the CMS inclusive differential Z production data at s = 8     TeV journal August 2016
Precision measurement and interpretation of inclusive $$W^+$$ W + , $$W^-$$ W - and $$Z/\gamma ^*$$ Z / γ ∗ production cross sections with the ATLAS detector journal June 2017
Measurement of associated Z + charm production in proton–proton collisions at $$\sqrt{s} = 8$$ s = 8 $$\,\text {TeV}$$ TeV journal April 2018
Measurement of associated production of a $$\mathrm {W}$$ W boson and a charm quark in proton–proton collisions at $$\sqrt{s} = 13\,\text {Te}\text {V} $$ s = 13 Te journal March 2019
Probing the strange content of the proton with charm production in charged current at LHeC journal October 2019
Illuminating the photon content of the proton within a global PDF analysis journal January 2018
Associated production of electroweak bosons and heavy mesons at LHCb and the prospects to observe double parton interactions text January 2016
Probing the strange content of the proton with charm production in charged current at LHeC text January 2019

Linked Research (7)

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