# Measurement of Wγ and Zγ production in pp collisions at √s = 7 TeV

CMS Collaboration; Amsler, C; Chiochia, V; Snoek, H; Favaro, C; Verzetti, M; Otyugova, P; Schmitt, A; De Visscher, S; Storey, J; Ivova, M; Millan, B; Aguiló, E (2011). Measurement of Wγ and Zγ production in pp collisions at √s = 7 TeV. Physics Letters B, 701(5):535-555.

## Abstract

A measurement of W-gamma and Z-gamma production in proton-proton collisions at sqrt(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 inverse picobarns. 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.

## Abstract

A measurement of W-gamma and Z-gamma production in proton-proton collisions at sqrt(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 inverse picobarns. 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.

## Citations

22 citations in Web of Science®
35 citations in Scopus®

## Altmetrics

Other titles: Measurement of W-gamma and Z-gamma production in pp collisions at sqrt(s) = 7 TeV Journal Article, refereed, original work 07 Faculty of Science > Physics Institute 530 Physics English 2011 13 Feb 2012 09:19 05 Apr 2016 15:36 Elsevier 0370-2693 (P) 1873-2445 (E) https://doi.org/10.1016/j.physletb.2011.06.034 http://arxiv.org/abs/1105.2758

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