Search for Higgs boson decays into two new low-mass spin-0 particles in the 4b channel with the ATLAS detector using pp collisions at √s = 13 TeV

0537887 - FZÚ 2021 RIV US eng J - Journal Article
Aad, G. - Abbott, B. - Abbott, D.C. - Chudoba, Jiří - Hejbal, Jiří - Hladík, Ondřej - Jačka, Petr - 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 2897 authors
Search for Higgs boson decays into two new low-mass spin-0 particles in the 4b channel with the ATLAS detector using pp collisions at √s = 13 TeV.
Physical Review D. Roč. 102, č. 11 (2020), s. 1-28, č. článku 112006. ISSN 2470-0010. E-ISSN 2470-0029
R&D Projects: GA MŠMT(CZ) LTT17018
Research Infrastructure: CERN-CZ II - 90104
Institutional support: RVO:68378271
Keywords : ATLAS * CERN * LHC * Higgs particle * decay modes * bottom * multiple production
OECD category: Particles and field physics
Impact factor: 5.296, year: 2020
Method of publishing: Open access

This paper describes a search for beyond the Standard Model decays of the Higgs boson into a pair of new spin-0 particles subsequently decaying into bbb-quark pairs, H→aa→(bbˉ)(bbˉ)H ightarrow aa ightarrow (b ar{b})(b ar{b})H→aa→(bbˉ)(bbˉ), using proton-proton collision data collected by the ATLAS detector at the Large Hadron Collider at center-of-mass energy s=13sqrt{s}=13s ​=13 TeV. This search focuses on the regime where the decay products are collimated and in the range 15≤ma≤3015 leq m_a leq 3015≤ma​≤30 GeV and is complementary to a previous search in the same final state targeting the regime where the decay products are well separated and in the range 20≤ma≤6020 leq m_a leq 6020≤ma​≤60 GeV. A novel strategy for the identification of the a→bbˉa ightarrow b ar{b}a→bbˉ decays is deployed to enhance the efficiency for topologies with small separation angles.
Permanent Link: http://hdl.handle.net/11104/0315719