Study of (W/Z)H production and Higgs boson couplings using $H → WW^*$ decays with the ATLAS detector
Journal
JHEP
Journal Volume
08
Pages
137
Date Issued
2015
Author(s)
Aad, Georges
Abstract
A search for Higgs boson production in association with a W or Z boson, in the H W W * decay channel, is performed with a data sample collected with the ATLAS detector at the LHC in proton-proton collisions at centre-of-mass energies s = 7 TeV and 8 TeV, corresponding to integrated luminosities of 4.5 fb -1 and 20.3 fb -1 , respectively. The W H production mode is studied in two-lepton and three-lepton final states, while twolepton and four-lepton final states are used to search for the ZH production mode. The observed significance, for the combined W H and ZH production, is 2.5 standard deviations while a significance of 0.9 standard deviations is expected in the Standard Model Higgs boson hypothesis. The ratio of the combined W H and ZH signal yield to the Standard Model expectation, V H , is found to be V H = 3.0 +1.3 -1.1 (stat.) +1.0 -0.7 (sys.) for the Higgs boson mass of 125.36 GeV. The W H and ZH production modes are also combined with the gluon fusion and vector boson fusion production modes studied in the H W W * decay channel, resulting in an overall observed significance of 6.5 standard deviations and ggF+VBF+VH = 1.16 +0.16 -0.15 (stat.) +0.18 -0.15 (sys.). The results are interpreted in terms of scaling factors of the Higgs boson couplings to vector bosons ( V ) and fermions ( F ); the combined results are: | V | = 1.06 +0.10 -0.10 , | F | = 0.85 +0.26 -0.20 .
Type
journal article