Measurement of associated W plus charm production in pp collisions atroot s 7 TeV

BAKIRCI, MUSTAFA NUMAN

doi:10.1007/JHEP02(2014)013

Measurement of associated W plus charm production in pp collisions atroot s 7 TeV

Yazarlar (1)

Doç. Dr. Mustafa Numan BAKIRCI Tokat Gaziosmanpaşa Üniversitesi, Türkiye

Makale Türü	Özgün Makale (SSCI, AHCI, SCI, SCI-Exp dergilerinde yayınlanan tam makale)
Dergi Adı	Journal of High Energy Physics (Q4)
Dergi ISSN	1126-6708
Dergi Tarandığı Indeksler	SCI
Makale Dili	İngilizce	Basım Tarihi	01-2014
Cilt / Sayı / Sayfa	2014 / 2 / –	DOI	10.1007/JHEP02(2014)013
UAK Araştırma Alanları	Yüksek Enerji ve Parçacık Fiziği

Özet

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 pT ^jet > 25 GeV, |η^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^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 (pT ^ℓ > 25 GeV) and σ(pp → W + c + X)× B (W → ℓν) = 84.1 ± 2.0 (stat.) ± 4.9 (syst.) pb (pT ^ℓ > 35 GeV), and the cross section ratios σ(pp → W⁺ + c̄ + X)/σ(pp → W^- + c + X) = 0.954 ± 0.025 (stat.) ± 0.004 (syst.) (pT ^ℓ > 25 GeV) and σ(pp → W⁺ + c̄ + X)/σ(pp → W^- + c + X) = 0.938 ± 0.019 (stat.) ± 0.006 (syst.) (p T ^ℓ > 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. © The Authors.

Anahtar Kelimeler

Hadron-Hadron Scattering

BM Sürdürülebilir Kalkınma Amaçları

Atıf Sayıları
Scopus	80

Measurement of associated W plus charm production in pp collisions atroot s 7 TeV

Measurement of associated W plus charm production in pp collisions atroot s 7 TeV

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