Study of (W/Z)H production and Higgs boson couplings using H→WW∗ decays with the ATLAS detector

ATLAS, Collaboration; Beck, Hans Peter; Cervelli, Alberto; Ereditato, Antonio; Haug, Sigve; Kabana, Sonja; Meloni, Federico; Mullier, Geoffrey André Adrien; Pretzl, Klaus-Peter; Stramaglia, Maria Elena; Stucci, Stefania; Weber, Michael (2015). Study of (W/Z)H production and Higgs boson couplings using H→WW∗ decays with the ATLAS detector. Journal of High Energy Physics, 8(8), p. 137. Springer 10.1007/JHEP08(2015)137

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A search for Higgs boson production in association with a W or Z boson, in the H→WW∗ 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 WH production mode is studied in two-lepton and three-lepton final states, while two-lepton and four-lepton final states are used to search for the ZH production mode. The observed significance, for the combined WH 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 WH and ZH signal yield to the Standard Model expectation, μ VH, is found to be μ VH =3.0 +1.3 −1.1 (stat.) +1.0 −0.7 (sys.) for the Higgs boson mass of 125.36 GeV. The WH and ZH production modes are also combined with the gluon fusion and vector boson fusion production modes studied in the H→WW ∗ →ℓνℓν decay channel, resulting in an overall observed significance of 6.5 standard deviations and μ 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 (κ V ) and fermions (κ F ); the combined results are: |κ V |=1.06 +0.10 −0.10 , |κ F |=0.85 +0.26 −0.20.

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