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Title

Search for the Higgs boson produced in association with a vector boson and decaying into two spin-zero particles in the H → aa → 4 b channel in pp collisions at √s = 13 TeV with the ATLAS detector

CollaborationWith : Akilli, Ece / Amrouche, Cherifa Sabrina / Ancu, Lucian Stefan / Benoit, Mathieu / Calace, Noemi / Clark, Allan Geoffrey / Della Volpe, Domenico / Di Bello, Francesco / Dubreuil, Arnaud / Fawcett, William / Ferrere, Didier / Gadatsch, Stefan / Golling, Tobias / Gonzalez Sevilla, Sergio / Iacobucci, Giuseppe / Iizawa, Tomoya / Jansky, Roland / Khoo, Teng Jian / Kiehn, Moritz / Lanfermann, Marie Christine / Lionti, Anthony Eric / March Ruiz, Luis / Mermod, Philippe / Nessi, Marzio / Paolozzi, Lorenzo / Poggi, Riccardo / Salamani, Dalila / Schramm, Steven / Sfyrla, Anna / Sultan, D M S / Valente, Marco / Vicente Barreto Pinto, Mateus / Wu, Xin / Zaffaroni, Ettore
Published in Journal of High Energy Physics. 2018, vol. 1810, p. 031
Collection Open Access - SCOAP3
Abstract A search for exotic decays of the Higgs boson into a pair of spin-zero particles, H → aa , where the a -boson decay sin to b -quarks promptly or with a mean proper lifetime cτ a up to 6 mm and has a mass in the range of 20–60 GeV, is presented. The search is performed in events where the Higgs boson is produced in association with a W or Z boson, giving rise to a signature of one or two charged leptons (electrons or muons) and multiple jets from b -quark decays. The analysis is based on the dataset of proton-proton collisions at √s = 13 TeV recorded in 2015 and 2016 by the ATLAS detector at the CERN Large Hadron Collider, corresponding to an integrated luminosity of 36.1 fb −1 . No significant excess of events above the Standard Model background prediction is observed, and 95% confidence-level upper limits are derived for the production cross-sections for pp → WH , ZH and their combination, times the branching ratio of the decay chain H → aa → 4 b . For a -bosons which decay promptly, the upper limit on the combination of cross-sections for WH and ZH times the branching ratio of H → aa → 4 b ranges from 3.0 pb for m a = 20 GeV to 1.3 pb for m a = 60 GeV, assuming that the ratio of WH to ZH cross-sections follows the Standard Model prediction. For a -bosons with longer proper lifetimes, the most stringent limits are 1.8 pb and 0.68 pb, respectively, at cτ a ∼ 0.4 mm.
Keywords Beyond Standard ModelHadron-Hadron scattering (experiments)Higgs physics
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arXiv: 1806.07355
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ATLAS COLLABORATION. Search for the Higgs boson produced in association with a vector boson and decaying into two spin-zero particles in the H → aa → 4 b channel in pp collisions at √s = 13 TeV with the ATLAS detector. In: Journal of High Energy Physics, 2018, vol. 1810, p. 031. https://archive-ouverte.unige.ch/unige:110371

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Deposited on : 2018-11-05

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