0434862 - FZÚ 2015 RIV US eng J - Journal Article
Aad, G. - Abbott, B. - Abdallah, J. - Böhm, Jan - Chudoba, Jiří - Havránek, Miroslav - Hejbal, Jiří - Jakoubek, Tomáš - Kepka, Oldřich - Kupčo, Alexander - Kůs, Vlastimil - Lokajíček, Miloš - Lysák, Roman - Marčišovský, Michal - Mikeštíková, Marcela - Myška, Miroslav - Němeček, Stanislav - Šícho, Petr - Staroba, Pavel - Svatoš, Michal - Taševský, Marek - Vrba, Václav … Total 2891 authors
Search for top quark decays t→qH with H→γγ using the ATLAS detector.
Journal of High Energy Physics. Roč. 2014, č. 6 (2014), s. 1-40. ISSN 1029-8479. E-ISSN 1029-8479
R&D Projects: GA MŠMT(CZ) LG13009
Institutional support: RVO:68378271
Keywords : ATLAS * neutral current * flavor changing * top * branching ratio * upper limit * CERN LHC Coll
Subject RIV: BF - Elementary Particles and High Energy Physics
Impact factor: 6.111, year: 2014 ; AIS: 1.26, rok: 2014
DOI: https://doi.org/10.1007/JHEP06(2014)008

A search is performed for flavour-changing neutral currents in the decay of a top quark to an up-type (c,u) quark and a Higgs boson, where the Higgs boson decays to two photons. The proton-proton collision data set used corresponds to 4.7 fb−1 at s√ = 7 /tev/ and 20.3 fb−1 at s√ = 8 /tev/ collected by the ATLAS experiment at the LHC. Top quark pair events are searched for in which one top quark decays to qH and the other decays to bW. Both the hadronic and the leptonic decay modes of the W boson are used. No significant signal is observed and an upper limit is set on the t→qH branching ratio of 0.79% at the 95% confidence level. The corresponding limit on the tqH coupling combination λ2tcH+λ2tuH−√ is 0.17.
Permanent Link: http://hdl.handle.net/11104/0238833