Observation and measurement of Higgs boson decays to WW* with the ATLAS detector
Author(s)Taylor, Frank E.
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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[superscript −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 over −0.15](stat)[+0.17 over −0.14](syst). The corresponding ratios for the gluon fusion and vector-boson fusion production mechanisms are 1.02 ± 0.19(stat)[+0.22 over −0.18](syst) and 1.27[+0.44 over −0.40](stat)[+0.30 over −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 over −0.7](syst) pb and σ(VBF H → WW*) = 0.51[+0.17 over −0.15](stat)[+0.13 over −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.
DepartmentMassachusetts Institute of Technology. Department of Physics
Physical Review D
American Physical Society
Aad, G., B. Abbott, J. Abdallah, S. Abdel Khalek, O. Abdinov, R. Aben, B. Abi, et al. “Observation and measurement of Higgs boson decays to WW* with the ATLAS detector.” Phys. Rev. D 92, no. 1 (July 2015). © 2015 CERN, for the ATLAS Collaboration
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