Search for the bb decay of the Standard Model Higgs boson in associated (W/Z)H production with the ATLAS detector

G Aad, Tracey Berry, Veronique Boisvert, Tim Brooks, Ian Connelly, Neil Cooper-Smith, Glen Cowan, Liam Duguid, Simon George, Stephen Gibson, Jacob Kempster, J G Panduro Vazquez, Francesca Pastore, Matthew Rose, Francesco Spano, Pedro Teixeira-Dias, Joshuha Thomas-Wilsker, The ATLAS Collaboration

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Abstract

A search for the bb¯ decay of the Standard Model Higgs boson is performed with the ATLAS experiment using the full dataset recorded at the LHC in Run 1. The integrated luminosities used are 4.7 and 20.3 fb−1 from pp collisions at √s=7 and 8 TeV, respectively. The processes considered are associated (W/Z)H production, where W → eν/μν, Z → ee/μμ and Z → νν. The observed (expected) deviation from the background-only hypothesis corresponds to a significance of 1.4 (2.6) standard deviations and the ratio of the measured signal yield to the Standard Model expectation is found to be μ = 0.52 ± 0.32 (stat.) ± 0.24 (syst.) for a Higgs boson mass of 125.36 GeV. The analysis procedure is validated by a measurement of the yield of (W/Z)Z production with Z→bb¯ in the same final states as for the Higgs boson search, from which the ratio of the observed signal yield to the Standard Model expectation is found to be 0.74 ± 0.09 (stat.) ± 0.14 (syst.).
Original languageEnglish
Article number69
Pages (from-to)1-89
Number of pages89
JournalJournal of High Energy Physics
Volume2015
DOIs
Publication statusPublished - 14 Jan 2015

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