Searches for exclusive Higgs and Z boson decays into J/ψγ, ψ(2S)γ and Υ(nS)γ at √s=13 TeV with the ATLAS detector

0500458 - FZÚ 2019 RIV NL eng J - Článek v odborném periodiku
Aaboud, M. - Aad, G. - Abbott, B. - 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 … celkem 2916 autorů
Searches for exclusive Higgs and Z boson decays into J/ψγ, ψ(2S)γ and Υ(nS)γ at √s=13 TeV with the ATLAS detector.
Physics Letters. B. Roč. 786, Nov (2018), s. 134-155. ISSN 0370-2693. E-ISSN 1873-2445
Grant CEP: GA MŠMT(CZ) LTT17018
Institucionální podpora: RVO:68378271
Klíčová slova: ATLAS * CERN LHC Coll * background * CERN lab * photon * associated production * experimental results * Higgs particle --> J/psi(3100) photon
Obor OECD: Particles and field physics
Impakt faktor: 4.162, rok: 2018

Searches for the exclusive decays of the Higgs and Z bosons into a J/ψ , ψ(2S) , or ϒ(nS) ( n=1,2,3 ) meson and a photon are performed with a pp collision data sample corresponding to an integrated luminosity of 36.1fb−1 collected at s=13TeV with the ATLAS detector at the CERN Large Hadron Collider. No significant excess of events is observed above the expected backgrounds, and 95% confidence-level upper limits on the branching fractions of the Higgs boson decays to J/ψγ , ψ(2S)γ , and ϒ(nS)γ of 3.5×10−4 , 2.0×10−3 , and (4.9,5.9,5.7)×10−4 , respectively, are obtained assuming Standard Model production. The corresponding 95% confidence-level upper limits for the branching fractions of the Z boson decays are 2.3×10−6 , 4.5×10−6 and (2.8,1.7,4.8)×10−6 , respectively.
Trvalý link: http://hdl.handle.net/11104/0292528