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Combination of searches for Higgs boson pairs in pp collisions at √s = 13 TeV with the ATLAS detector

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    0537318 - FZÚ 2021 RIV NL eng J - Journal Article
    Aad, G. - Abbott, B. - Abbott, D.C. - Chudoba, Jiří - Hejbal, Jiří - Hladík, Ondřej - Jačka, Petr - Jakoubek, Tomáš - Kepka, Oldřich - Kroll, Jiří - Kupčo, Alexander - Lokajíček, Miloš - Lysák, Roman - Marčišovský, Michal - Mikeštíková, Marcela - Němeček, Stanislav - Penc, Ondřej - Šícho, Petr - Staroba, Pavel - Svatoš, Michal - Taševský, Marek … Total 2911 authors
    Combination of searches for Higgs boson pairs in pp collisions at √s = 13 TeV with the ATLAS detector.
    Physics Letters. B. Roč. 800, Jan (2020), s. 1-23, č. článku 135103. ISSN 0370-2693. E-ISSN 1873-2445
    R&D Projects: GA MŠMT(CZ) LTT17018
    Research Infrastructure: CERN-CZ II - 90104
    Institutional support: RVO:68378271
    Keywords : ATLAS * CERN * LHC * S046OTH * Higgs particle * pair production
    OECD category: Particles and field physics
    Impact factor: 4.771, year: 2020
    Method of publishing: Open access

    This letter presents a combination of searches for Higgs boson pair production using up to 36.1 fb−1^{-1}−1 of proton-proton collision data at a centre-of-mass energy s=13sqrt{s} = 13s ​=13 TeV recorded with the ATLAS detector at the LHC. The combination is performed using six analyses searching for Higgs boson pairs decaying into the bbbb, bbWW, bbττ au auττ, WWWW, bbγγgamma gammaγγ and WWγγgammagammaγγ final states. Results are presented for non-resonant and resonant Higgs boson pair production modes. The combined observed limit at 95% confidence level on the non-resonant Higgs boson pair production cross-section is 6.9 times the predicted Standard Model cross-section. Limits are also set on the ratio (κλkappa_{lambda}κλ​) of the Higgs boson self-coupling to its Standard Model value. This ratio is constrained at 95% confidence level to −5.0<κλ<12.0-5.0 < kappa_{lambda} <12.0−5.0<κλ​<12.0.

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