Chatrchyan, S. ; Khachatryan, V. ; Sirunyan, A. M. ; Tumasyan, A. ; Mondal, N. K. ; et., al. (2011) Measurement of Wγ and Zγ production in pp collisions at √s = 7 TeV Physics Letters B, 701 (5). pp. 535-555. ISSN 0370-2693
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Official URL: http://www.sciencedirect.com/science/article/pii/S...
Related URL: http://dx.doi.org/10.1016/j.physletb.2011.06.034
Abstract
A measurement of Wγ and Zγ production in proton-proton collisions at√s=7 TeV is presented. Results are based on a data sample recorded by the CMS experiment at the LHC, corresponding to an integrated luminosity of 36 pb-1. The electron and muon decay channels of the W and Z are used. The total cross sections are measured for photon transverse energy Eγ T>10 GeV and spatial separation from charged leptons in the plane of pseudorapidity and azimuthal angle ΔR(ℓ,γ)>0.7, and with an additional dilepton invariant mass requirement of Mℓℓ>50 GeV for the Zγ process. The following cross section times branching fraction values are found: σ(pp→Wγ+X)xB(W→lν)=56.3±5.0(stat.)±5.0(syst.)±2.3(lumi.) pb and σ(pp→Zγ+X)xB(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 WWγ, ZZγ, and Zγγ trilinear gauge couplings at √s=7 TeV are set.
Item Type: | Article |
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Source: | Copyright of this article belongs to Elsevier Science. |
Keywords: | CMS; Physics; Electroweak |
ID Code: | 89980 |
Deposited On: | 04 May 2012 05:10 |
Last Modified: | 04 May 2012 05:10 |
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