Evidence for exclusive γγ → W+ W production and constraints on anomalous quartic gauge couplings in pp collisions at √s = 7 and 8 TeV

The CMS collaboration

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Abstract

A search for exclusive or quasi-exclusive γγ → W+W production, via pp → p(*)W+Wp(*) → p(*)μ±ep(*) 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 pT±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 a0,CW (dimension-6) and fM0,1,2,3 (dimension-8), the most stringent to date, are derived from the measured dilepton transverse momentum spectrum.

Original languageEnglish
Article number119
JournalJournal of High Energy Physics
Volume2016
Issue number8
DOIs
Publication statusPublished - 1 Aug 2016

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Keywords

  • Forward physics
  • Hadron-Hadron scattering (experiments)

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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