Search for a high-mass Higgs boson decaying to a W boson pair in pp collisions at s = 8 $$ \sqrt{s}=8 $$ TeV with the ATLAS detector
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Abstract
A search for a high-mass Higgs boson H is performed in the HW W and HW W qq decay channels using pp collision data corresponding to an integrated luminosity of 20.3 fb -1 collected at s = 8 TeV by the ATLAS detector at the Large Hadron Collider. No evidence of a high-mass Higgs boson is found. Limits on H BR(HW W ) as a function of the Higgs boson mass m H are determined in three different scenarios: one in which the heavy Higgs boson has a narrow width compared to the experimental resolution, one for a width increasing with the boson mass and modeled by the complex-pole scheme following the same behavior as in the Standard Model, and one for intermediate widths. The upper range of the search is m H = 1500 GeV for the narrow-width scenario and m H = 1000 GeV for the other two scenarios. The lower edge of the search range is 200-300 GeV and depends on the analysis channel and search scenario. For each signal interpretation, individual and combined limits from the two W W decay channels are presented. At m H = 1500 GeV, the highest-mass point tested, H BR(H W W ) for a narrow-width Higgs boson is constrained to be less than 22 fb and 6.6 fb at 95% CL for the gluon fusion and vector-boson fusion production modes, respectively.
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