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Measurement of the W gamma and Z gamma inclusive cross sections in pp collisions at sqrt(s) = 7 TeV and limits on anomalous triple gauge boson couplings

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arxiv 1308.6832 v2 pith:BIRGSHCM submitted 2013-08-30 hep-ex

classification hep-ex
keywords gammaanomalouscouplingsgaugelimitstriplecollisionscross
verification ladder T0 review T1 audit T2 compute T3 formal
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Measurements of W gamma and Z gamma production in proton-proton collisions at sqrt(s) = 7 TeV are used to extract limits on anomalous triple gauge couplings. The results are based on data recorded by the CMS experiment at the LHC that correspond to an integrated luminosity of 5.0 inverse femtobarns. The cross sections are measured for photon transverse momenta pt[gamma] > 15 GeV, and for separations between photons and final-state charged leptons in the pseudorapidity-azimuthal plane of Delta R[l, gamma] > 0.7 in l nu gamma and ll gamma final states, where l refers either to an electron or a muon. A dilepton invariant mass requirement of m[ll] > 50 GeV is imposed for the Z gamma process. No deviations are observed relative to predictions from the standard model, and limits are set on anomalous WW gamma, ZZ gamma, and Z gamma gamma triple gauge couplings.

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