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Paper   IPM / Particles / 11883
School of Particles and Accelerator
Title:   Measurement of Wg and Zg production in pp collisions at sqrt(s) = 7 TeV
Author(s):
 1 Hessamadin Arfaei 2 Hamed Bakhshiansohi 3 Seyed Mohsen Etesami 4 Ali Fahim 5 Majid Hashemi 6 Abideh Jafari 7 Mohsen Khakzad 8 A Mohammadi 9 Mojtaba Mohammadi Najafabadi 10 Saeid Paktinat Mehdiabadi 11 Batool Safarzadeh 12 Maryam Zeinali
Status:   Published
Journal: Phys. Lett. B
Vol.:  701
Year:  2011
Pages:   535-555
Supported by:  IPM
Abstract:
A measurement of Wg and Zg production in proton-proton collisions at sqrt(s)= 7 TeV, based on a data sample recorded by the CMS experiment at the LHC, and corresponding to an integrated luminosity of 36 pb(-1), is presented. The electron and muon decay channels of the W and Z are used. The total cross sections are measured for photon transverse energy E g T > 10 GeV and spatial separation from charged leptons in the plane of pseudorapidity and azimuthal angle DR(`, g) > 0.7, and with an additional dilepton invariant mass requirement of Mll > 50 GeV for the Zg process. The following cross section times branching fraction values are found: s(pp - Wg + X) * B(W - lv) = 56.3 5.0 (stat.) +- 5.0 (syst.)  2.3 (lumi.) pb and s(pp - Zg + X) * B(Z - ll) = 9.4 +- 1.0 (stat.) +- 0.6 (syst.)  0.4 (lumi.) pb. These measurements are in agreement with standard model predictions. The first limits on anomalous WWg, ZZg, and Zgg trilinear gauge couplings at sqrt(s)= 7 TeV are set