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

• Main Authors: Alver, B. (Contributor), Bauer, Gerry P. (Contributor), Bendavid, Joshua L. (Contributor), Busza, Wit (Contributor), Butz, Erik M. (Contributor), Cali, Ivan Amos (Contributor), Chan, M. (Contributor), Dutta, V. (Contributor), Everaerts, Pieter Bruno Bart (Contributor), Gomez-Ceballos, Guillelmo (Contributor), Goncharov, Maxim (Contributor), Hahn, Kristian Allan (Contributor), Harris, P. (Contributor), Kim, Y. (Contributor), Klute, Markus (Contributor), Lee, Y.-J (Contributor), Li, W. (Contributor), Loizides, C. (Contributor), Luckey, P. David, Jr (Contributor), Ma, Teng (Contributor), Nahn, Steven (Contributor), Paus, Christoph M. E. (Contributor), Ralph, Duncan Kelley (Contributor), Roland, Christof E. (Contributor), Roland, Gunther M. (Contributor), Rudolph, Matthew Scott (Contributor), Stephans, George S. F. (Contributor), Stockli, Fabian (Contributor), Sumorok, Konstanty C. (Contributor), Sung, Kevin Kai Hong (Contributor), Wenger, Edward Allen (Contributor), Xie, S. (Contributor), Yang, M. (Contributor), Yilmaz, Yetkin (Contributor), Yoon, A. S. (Contributor), Zanetti, Marco (Contributor), Wyslouch, Boleslaw (Contributor)
• Other Authors: Massachusetts Institute of Technology. Department of Physics (Contributor), Massachusetts Institute of Technology. Laboratory for Nuclear Science (Contributor), Massachusetts Institute of Technology. School of Science (Contributor)
• Format: Article
• Language: English
• Published: Elsevier, 2014-12-23T17:23:15Z.
• Subjects: Article
• Online Access: Get fulltext

 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.