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  • PhysRevD.92

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Observation and measurement of Higgs boson decays to WW∗ with the ATLAS detector

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Article number012006
<mark>Journal publication date</mark>1/07/2015
<mark>Journal</mark>Physical Review D
Issue number1
Volume92
Number of pages84
Publication StatusPublished
<mark>Original language</mark>English

Abstract

We report the observation of Higgs boson decays to WW ∗ based on an excess over background of 6.1 standard deviations in the dilepton final state, where the Standard Model expectation is 5.8 standard deviations. Evidence for the vector-boson fusion (VBF) production process is obtained with a significance of 3.2 standard deviations. The results are obtained from a data sample corresponding to an integrated luminosity of 25  fb −1 from s √ =7 and 8 TeV pp collisions recorded by the ATLAS detector at the LHC. For a Higgs boson mass of 125.36 GeV, the ratio of the measured value to the expected value of the total production cross section times branching fraction is 1.09 +0.16 −0.15 (stat) +0.17 −0.14 (syst) . The corresponding ratios for the gluon fusion and vector-boson fusion production mechanisms are 1.02±0.19(stat) +0.22 −0.18 (syst) and 1.27 +0.44 −0.40 (stat) +0.30 −0.21 (syst) , respectively. At s √ =8  TeV , the total production cross sections are measured to be σ(gg→H→WW ∗ )=4.6±0.9(stat) +0.8 −0.7 (syst)  pb and σ(VBF  H→WW ∗ )=0.51 +0.17 −0.15 (stat) +0.13 −0.08 (syst)  pb . The fiducial cross section is determined for the gluon-fusion process in exclusive final states with zero or one associated jet.

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This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. © 2015 CERN, for the ATLAS Collaboration