Measurement of the W+W cross section in pp collisions at √s = 8 TeV and limits on anomalous gauge couplings

CMS Collaboration

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Abstract

A measurement of the W boson pair production cross section in proton-proton collisions at √s = 8 TeV is presented. The data collected with the CMS detector at the LHC correspond to an integrated luminosity of 19.4 fb−1. The W+W candidates are selected from events with two charged leptons, electrons or muons, and large missing transverse energy. The measured W+W cross section is 60.1 ± 0.9 (stat) ± 3.2 (exp) ± 3.1 (theo) ± 1.6 (lumi) pb = 60.1±4.8 pb, consistent with the standard model prediction. The W+W cross sections are also measured in two different fiducial phase space regions. The normalized differential cross section is measured as a function of kinematic variables of the final-state charged leptons and compared with several perturbative QCD predictions. Limits on anomalous gauge couplings associated with dimension-six operators are also given in the framework of an effective field theory. The corresponding 95 % confidence level intervals are −5.7 <
cWWW2 < 5.9 TeV−2, −11.4 < cW2 < 5.4 TeV−2, −29.2 < cB2 < 23.9TeV−2, in the HISZ basis.
Original languageEnglish
Article number401
Number of pages29
JournalEuropean Physical Journal C
Volume76
Issue number7
DOIs
Publication statusPublished - 2016
Externally publishedYes

Keywords

  • Collisions
  • Proton–proton collisions
  • Jets

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