Search for top quark decays t→qH, with H→γγ, in √s = 13 TeV pp collisions using the ATLAS detector

0487760 - FZÚ 2018 RIV US eng J - Journal Article
Aaboud, M. - Aad, G. - Abbott, B. - Chudoba, Jiří - Hejbal, Jiří - Hladík, Ondřej - Jakoubek, Tomáš - Kepka, Oldřich - Kroll, Jiří - Kupčo, Alexander - Kůs, Vlastimil - Lokajíček, Miloš - Lysák, Roman - Marčišovský, Michal - Mikeštíková, Marcela - Němeček, Stanislav - Penc, Ondřej - Šícho, Petr - Staroba, Pavel - Svatoš, Michal - Taševský, Marek … Total 2862 authors
Search for top quark decays t→qH, with H→γγ, in √s = 13 TeV pp collisions using the ATLAS detector.
Journal of High Energy Physics. Roč. 2017, č. 10 (2017), s. 1-43, č. článku 129. ISSN 1029-8479. E-ISSN 1029-8479
Institutional support: RVO:68378271
Keywords : flavour changing neutral currents * Hadron-Hadron scattering (experiments) * Higgs physics * top physics
OECD category: Particles and field physics
Impact factor: 5.541, year: 2017

This article presents a search for flavour-changing neutral currents in the decay of a top quark into an up-type (q = c, u) quark and a Higgs boson, where the Higgs boson decays into two photons. The proton-proton collision data set analysed amounts to 36.1 fb−1 at √s=13 TeV collected by the ATLAS experiment at the LHC. Top quark pair events are searched for, where one top quark decays into qH and the other decays into bW . Both the hadronic and leptonic decay modes of the W boson are used. No significant excess is observed and an upper limit is set on the t → cH branching ratio of 2.2 × 10−3 at the 95% confidence level, while the expected limit in the absence of signal is 1.6 × 10−3. The corresponding limit on the tcH coupling is 0.090 at the 95% confidence level. The observed upper limit on the t → uH branching ratio is 2.4 × 10−3.


Permanent Link: http://hdl.handle.net/11104/0282392