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

CMS Collaboration

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Abstract

A search for exclusive or quasi-exclusive γγ → W+W- production, via pp → p(∗)W+W-p(∗) → p(∗)μ±e±p(∗) at √s = 8TeV, 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 8TeV results are combined with the previous 7TeV results (obtained for 5.05 fb-1of 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 aW0,C (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
Number of pages47
JournalJournal of High Energy Physics
Volume2016
Issue number8
DOIs
Publication statusPublished - 2016
Externally publishedYes

Keywords

  • Forward physics
  • Hadron-Hadron scattering (experiments)

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