Measurement of Wγ and Zγ production in pp collisions at √s = 7 TeV
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Chatrchyan-2011-Measurement of W_ an.pdf
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Author(s)
Bendavid, Joshua L.
Busza, Wit
Butz, Erik M.
Cali, Ivan Amos
Chan, M.
Everaerts, Pieter Bruno Bart
Gomez-Ceballos, Guillelmo
Goncharov, Maxim
Hahn, Kristian Allan
Kim, Y.
Date Issued
June 2011
Journal
Physics Letters B
Publisher
Elsevier
Citation
Chatrchyan, S., V. Khachatryan, A.M. Sirunyan, A. Tumasyan, W. Adam, T. Bergauer, M. Dragicevic, et al. “Measurement of Wγ and Zγ Production in Pp Collisions at √s = 7 TeV.” Physics Letters B 701, no. 5 (July 2011): 535–555. © 2011 CERN
Version
Final published version
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[superscript −1]. The electron and muon decay channels of the W and Z are used. The total cross sections are measured for photon transverse energy E [γ over τ] > 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 M[subscript ℓℓ] > 50 GeV for the Zγ process. The following cross section times branching fraction values are found: σ(pp→Wγ+X) × B(W→ℓν) = 56.3 ± 5.0(stat.) ± 5.0(syst.) ± 2.3(lumi.) pb and σ(pp→Zγ+X) × B(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 source are set.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Massachusetts Institute of Technology. School of Science
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DOI of Published Version
https://doi.org/10.1016/j.physletb.2011.06.034
