Research Papers in Physics and Astronomy


Date of this Version



JHEP01(2014)096; doi:10.1007/JHEP01(2014)096


Copyright © 2014 CERN, issued under cc license; published by Springer.


A search for the standard model Higgs boson decaying to a W-boson pair at the LHC is reported. The event sample corresponds to an integrated luminosity of 4.9 fb1 and 19.4 fb1 collected with the CMS detector in pp collisions at √ s = 7 and 8TeV, respectively. The Higgs boson candidates are selected in events with two or three charged leptons. An excess of events above background is observed, consistent with the expectation from the standard model Higgs boson with a mass of around 125 GeV. The probability to observe an excess equal or larger than the one seen, under the background-only hypothesis, corresponds to a significance of 4.3 standard deviations for mH = 125.6 GeV. The observed signal cross section times the branching fraction to WW for mH = 125.6 GeV is 0.72+0.200.18 times the standard model expectation. The spin-parity JP = 0+ hypothesis is favored against a narrow resonance with JP = 2+ or JP = 0− that decays to a W-boson pair. This result provides strong evidence for a Higgs-like boson decaying to a W-boson pair.