Evidence for exclusive γγ → W⁺ W⁻ production and constraints on anomalous quartic gauge couplings in pp collisions at √s = 7 and 8 TeV
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JHEP08(2016)119.pdf
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Author(s)
CMS Collaboration
Apyan, Aram
Barbieri, Richard Alexander
Baty, Austin Alan
Bi, Ran
Bierwagen, Katharina
Brandt, Stephanie Akemi
Busza, Wit
Cali, Ivan Amos
Demiragli, Zeynep
Date Issued
June 13, 2018
Journal
Journal of High Energy Physics
Publisher
Springer Nature
Citation
Khachatryan, V. et al. “Evidence for exclusive γγ → W⁺ W⁻ production and constraints on anomalous quartic gauge couplings in pp collisions at √s = 7 and 8 TeV.” Journal of High Energy Physics 2016, 8 (August 2016): 119 © 2016 The Author(s)
Version
Final published version
Abstract
A search for exclusive or quasi-exclusive γγ → W⁺W⁻ production, via pp → p (*) W⁺W⁻p (*) → p (*) μ ± e ∓ p (*) at √s = 8 TeV, is reported using data corresponding to an integrated luminosity of 19.7 fb⁻¹. Events are selected by requiring the presence of an electron-muon pair with large transverse momentum p T (μ ± e ∓ ) > 30 GeV, and no associated charged particles detected from the same vertex. The 8 TeV results are combined with the previous 7 TeV results (obtained for 5.05 fb⁻¹ of data). In the signal region, 13 (2) events are observed over an expected background of 3.9 ± 0.6 (0.84 ± 0.15) events for 8 (7) TeV, resulting in a combined excess of 3.4σ over the background-only hypothesis. The observed yields and kinematic distributions are compatible with the standard model prediction for exclusive and quasi-exclusive γγ → W⁺ W⁻ production. Upper limits on the anomalous quartic gauge coupling operators a 0,C W (dimension-6) and f M0,1,2,3 (dimension-8), the most stringent to date, are derived from the measured dilepton transverse momentum spectrum.
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
https://doi.org/10.1007/JHEP08(2016)119
