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Title

Search for Higgs boson pair production in the WW (*) WW (*) decay channel using ATLAS data recorded at s $$ \sqrt{\mathrm{s}} $$ = 13 TeV

CollaborationWith : Akilli, Ece / Amrouche, Cherifa Sabrina / Ancu, Lucian Stefan / Benoit, Mathieu / Calace, Noemi / Clark, Allan Geoffrey / Della Volpe, Domenico / Di Bello, Francesco Armando / Dubreuil, Arnaud / 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 / Raine, Johnny / Salamani, Dalila / Schramm, Steven / Sfyrla, Anna / Sultan, D M S / Valente, Marco / Vicente Barreto Pinto, Mateus / Wu, Xin / Zaffaroni, Ettore
Published in The journal of high energy physics. 2019, vol. 1905, 124
Collection Open Access - SCOAP3
Abstract A search for a pair of neutral, scalar bosons with each decaying into two W bosons is presented using 36.1 fb −1 of proton-proton collision data at a centre-of-mass energy of 13 TeV recorded with the ATLAS detector at the Large Hadron Collider. This search uses three production models: non-resonant and resonant Higgs boson pair production and resonant production of a pair of heavy scalar particles. Three final states, classified by the number of leptons, are analysed: two same-sign leptons, three leptons, and four leptons. No significant excess over the expected Standard Model backgrounds is observed. An observed (expected) 95% confidence-level upper limit of 160 (120) times the Standard Model prediction of non-resonant Higgs boson pair production cross-section is set from a combined analysis of the three final states. Upper limits are set on the production cross-section times branching ratio of a heavy scalar X decaying into a Higgs boson pair in the mass range of 260 GeV ≤ m X ≤ 500 GeV and the observed (expected) limits range from 9.3 (10) pb to 2.8 (2.6) pb. Upper limits are set on the production cross-section times branching ratio of a heavy scalar X decaying into a pair of heavy scalars S for mass ranges of 280 GeV ≤ m X ≤ 340 GeV and 135 GeV ≤ m S ≤ 165 GeV and the observed (expected) limits range from 2.5 (2.5) pb to 0.16 (0.17) pb.
Keywords Hadron-Hadron scattering (experiments)
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arXiv: 1811.11028
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ATLAS COLLABORATION. Search for Higgs boson pair production in the WW (*) WW (*) decay channel using ATLAS data recorded at s $$ \sqrt{\mathrm{s}} $$ = 13 TeV. In: Journal of High Energy Physics, 2019, vol. 1905, p. 124. doi: 10.1007/JHEP05(2019)124 https://archive-ouverte.unige.ch/unige:118803

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Deposited on : 2019-06-04

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