Study of exclusive two-photon production of W⁺W⁻ in pp collisions at √s =7 TeV and constraints on anomalous quartic gauge couplings
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13130_2013_Article_6444.pdf
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Author(s)
Chatrchyan, S.
Khachatryan, V.
Sirunyan, A. M
Tumasyan, A.
Adam, W.
Bergauer, T.
Dragicevic, M.
Erö, J.
Fabjan, C.
Friedl, M.
Date Issued
July 2013
Journal
Journal of High Energy Physics
Publisher
Springer-Verlag
Citation
Chatrchyan, S., et al. "Study of exclusive two-photon production of W⁺W⁻ in pp collisions at √s =7 TeV and constraints on anomalous quartic gauge couplings". Journal of High Energy Physics, no. 116, 2013, pp. 1-44.
Version
Final published version
Abstract
A search for exclusive or quasi-exclusive W+W− production by photon-photon interactions, pp → p(*)W+W−p(*), at √s = 7 TeV is reported using data collected by the CMS detector with an integrated luminosity of 5.05 fb⁻¹. Events are selected by requiring a μ ±e∓ vertex with no additional associated charged tracks and dilepton transverse momentum pT(μ ±e∓) > 30 GeV. Two events passing all selection requirements are observed in the data, compared to a standard model expectation of 2.2 ± 0.4 signal events with 0.84 ± 0.15 background. The tail of the dilepton
pT distribution is studied for deviations from the standard model. No events are observed with pT > 100 GeV. Model-independent upper limits are computed and compared to predictions involving anomalous quartic gauge couplings. The limits on the parameters [alpha with subscript 0,C and superscript W]/ Λ² with a dipole form factor and an energy cutoff Λ [subscript cutoff] = 500 GeV are of the order of 10⁻⁴.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
http://dx.doi.org/10.1007/JHEP07(2013)116
