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

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

Authors:
 [1]
  1. Yerevan Physics Inst. (Armenia)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Org.:
CMS Collaboration
OSTI Identifier:
1155744
Report Number(s):
FERMILAB-PUB-11-737-CMS; CERN-PH-EP-2011-045
Journal ID: ISSN 0370-2693; arXiv eprint number arXiv:1105.2758
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 701; Journal Issue: 5; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Chatrchyan, Serguei, and et al. Measurement of W-gamma and Z-gamma production in pp collisions at sqrt(s) = 7 TeV. United States: N. p., 2011. Web. doi:10.1016/j.physletb.2011.06.034.
Chatrchyan, Serguei, & et al. Measurement of W-gamma and Z-gamma production in pp collisions at sqrt(s) = 7 TeV. United States. doi:10.1016/j.physletb.2011.06.034.
Chatrchyan, Serguei, and et al. Fri . "Measurement of W-gamma and Z-gamma production in pp collisions at sqrt(s) = 7 TeV". United States. doi:10.1016/j.physletb.2011.06.034. https://www.osti.gov/servlets/purl/1155744.
@article{osti_1155744,
title = {Measurement of W-gamma and Z-gamma production in pp collisions at sqrt(s) = 7 TeV},
author = {Chatrchyan, Serguei and et al.},
abstractNote = {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},
doi = {10.1016/j.physletb.2011.06.034},
journal = {Physics Letters. Section B},
issn = {0370-2693},
number = 5,
volume = 701,
place = {United States},
year = {2011},
month = {7}
}