# Measurement of W-gamma and Z-gamma production in pp collisions at sqrt(s) = 7 TeV

7 CMS
IP2I Lyon - Institut de Physique des 2 Infinis de Lyon
Abstract : A measurement of W-gamma and Z-gamma 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 inverse picobarns, 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 >10 GeV and spatial separation from charged leptons in the plane of pseudorapidity and azimuthal angle >0.7, and with an additional dilepton invariant mass requirement of > 50 GeV for the Z-gamma process. The following cross section times branching fraction values are found: sigma(pp to W-gamma+X) B(W \to lepton neutrino) = 56.3 +/- 5.0 (stat.) +/- 5.0 (syst.) +/- 2.3 (lumi.) pb and sigma(pp to Z-gamma+X) B}(Z to lepton lepton) = 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 WW gamma, ZZ gamma, and Z gamma gamma trilinear gauge couplings at sqrt(s) = 7 TeV are set.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00608473
Contributor : Sylvie Flores <>
Submitted on : Wednesday, July 13, 2011 - 11:11:23 AM
Last modification on : Wednesday, January 6, 2021 - 6:44:02 PM

### Citation

S. Chatrchyan, D. Sillou, M. Besancon, S. Choudhury, M. Dejardin, et al.. Measurement of W-gamma and Z-gamma production in pp collisions at sqrt(s) = 7 TeV. Physics Letters B, Elsevier, 2011, 701, pp.535-555. ⟨10.1016/j.physletb.2011.06.034⟩. ⟨in2p3-00608473⟩

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