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

CollaborationWith : Ancu, Lucian Stefan / Barone, Gaetano / Bell, William / Benhar Noccioli, Eleonora / Bilbao De Mendizabal, Javier / Camacho Toro, Reina / Clark, Allan Geoffrey / Delitzsch, Chris Malena / Della Volpe, Domenico / Doglioni, Caterina / Ferrere, Didier / Gadomski, Szymon / Golling, Tobias / Gonzalez Sevilla, Sergio / Gramling, Johanna Léna / Guescini, Francesco / Iacobucci, Giuseppe / Katre, Akshay / La Rosa, Alessandro / Mermod, Philippe / Miucci, Antonio / Muenstermann, Daniel / Nessi, Marzio / Paolozzi, Lorenzo / Picazio, Attilio / Ristic, Branislav / Tykhonov, Andrii / Vallecorsa, Sofia / Wu, Xin
Published in Journal of High Energy Physics. 2015, vol. 1508, p. 137-202
Collection Open Access - SCOAP3
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 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 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, μ V H , is found to be μ V H  = 3.0 − 1.1 + 1.3 (stat.) − 0.7 + 1.0 (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 ∗ → ℓνℓν decay channel, resulting in an overall observed significance of 6.5 standard deviations and μ ggF + VBF + VH  = 1. 16 − 0.15 + 0.16 (stat.) − 0.15 + 0.18 (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 − 0.20 + 0.26 .
Keywords Hadron-Hadron ScatteringHiggs physics
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arXiv: 1506.06641
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ATLAS COLLABORATION. Study of ( W/Z ) H production and Higgs boson couplings using H → W W ∗ decays with the ATLAS detector. In: Journal of High Energy Physics, 2015, vol. 1508, p. 137-202. https://archive-ouverte.unige.ch/unige:75560

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Deposited on : 2015-10-01

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