Measurement of associated W + charm production in pp collisions at sqrt(s) = 7 TeV

Abstract

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 pt[jet] > 25 GeV, abs(eta) < 2.5, for two different thresholds for the transverse momentum of the lepton from the W-boson decay, and in the pseudorapidity range abs(eta[ell]) < 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 (pt[ell] > 25 GeV) and sigma(pp to W + c + X) times B(W to ell nu) = 84.1 +/- 2.0 (stat.) +/- 4.9 (syst.) pb (pt[ell] > 35 GeV), and the cross section ratios sigma(pp to W+ + c + X)/sigma(pp to W- + c + X) = 0.954 +/- 0.025 (stat.) +/- 0.004 (syst.) (pt[ell] > 25 GeV) and sigma(pp to W+ + c bar + X)/sigma(pp to W- + c + X) = 0.938 +/- 0.019 (stat.) +/- 0.006 (syst.) (pt[ell] > 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.

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References in corpus (15)

• PYTHIA 6.4 Physics and Manual
• Parton distributions for the LHC
• New parton distributions for collider physics
• Pileup subtraction using jet areas
• The Catchment Area of Jets
• MCFM for the Tevatron and the LHC
• Electroweak gauge boson production at hadron colliders through O(alpha_s^2)
• Performance of CMS muon reconstruction in pp collision events at sqrt(s) = 7 TeV
• NLO vector-boson production matched with shower in POWHEG
• Precision determination of electroweak parameters and the strange content of the proton from neutrino deep-inelastic scattering
• Measurement of the electron charge asymmetry in inclusive W production in pp collisions at sqrt(s) = 7 TeV
• The impact of PDF uncertainties on the measurement of the W boson mass at the Tevatron and the LHC
• Strange Quark PDFs and Implications for Drell-Yan Boson Production at the LHC
• Measurement of the ratio of the $p\bar{p}\to W$+$c$-jet cross section to the inclusive $p\bar{p}\to W$+jets cross section
• Observation of the Production of a W Boson in Association with a Single Charm Quark

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