Measurement of associated W + charm production in pp collisions at √s = 7 TeV
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JHEP02(2014)013.pdf
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1.14 MB
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Checksum (MD5)
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Author(s)
CMS Collaboration
Apyan, Aram
Bauer, Gerry P
Busza, Wit
Cali, Ivan Amos
Chan, Matthew Hans
Di Matteo, Leonardo
Dutta, Valentina
Gomez-Ceballos, Guillelmo
Goncharov, Maxim
Date Issued
February 2014
Journal
Journal of High Energy Physics
Publisher
Springer Berlin Heidelberg
Citation
Chatrchyan, S. et al. “Measurement of associated W + charm production in pp collisions at √s = 7 TeV.” Journal of High Energy Physics 2014, 2 (February 2014): 13 © 2014 The Author(s)
Version
Final published version
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 fb⁻¹, 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[superscript jet][subscript T] > 25 GeV, |η[subscript jet]| < 2.5, for two different thresholds for the transverse momentum of the lepton from the W-boson decay, and in the pseudorapidity range |η[superscript ℓ]| < 2.1. Hadronic and inclusive semileptonic decays of charm hadrons are used to measure the following total cross sections: σ(pp → W + c + X) × B(W → ℓν) = 107.7 ± 3.3 (stat.) ± 6.9 (syst.) pb (p[superscript ℓ][subscript T] > 25 GeV) and σ(pp → W + c + X)×B(W → ℓν) = 84.1 ± 2.0 (stat.) ± 4.9 (syst.) pb (p[superscript ℓ][subscript T] > 35 GeV), and the cross section ratios σ(pp → W⁺ + c + X)/σ(pp → W⁻ + c + X) = 0.954 ± 0.025 (stat.) ± 0.004 (syst.) (p[superscript ℓ][subscript T]> 25 GeV) and σ(pp → W⁺ + c¯¯ + X)/σ(pp → W⁻ + c + X) = 0.938 ± 0.019 (stat.) ± 0.006 (syst.) (p[superscript ℓ][subscript T]> 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. Keywords: Hadron-Hadron Scattering
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution 4.0 International License
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DOI of Published Version
https://doi.org/10.1007/JHEP02(2014)013
