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Title

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

CollaborationWith : Akilli, Ece / Ancu, Lucian Stefan / Benoit, Mathieu / Calace, Noemi / Clark, Allan Geoffrey / Coccaro, Andrea / Della Volpe, Domenico / Di Bello, Francesco / Dubreuil, Arnaud / Ferrere, Didier / Golling, Tobias / Gonzalez Sevilla, Sergio / Iacobucci, Giuseppe / Jansky, Roland / Katre, Akshay / Khoo, Teng Jian / Lanfermann, Marie Christine / Lionti, Anthony Eric / March Ruiz, Luis / Mermod, Philippe / Nackenhorst, Olaf / Nessi, Marzio / Paolozzi, Lorenzo / Schramm, Steven / Sfyrla, Anna / Valente, Marco / Wu, Xin
Published in Journal of High Energy Physics. 2017, vol. 1710, p. 129-172
Collection Open Access - SCOAP3
Abstract 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 .
Keywords Flavour Changing Neutral CurrentsHadron-Hadron scattering (experiments)Higgs physicsTop physics
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arXiv: 1707.01302
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ATLAS COLLABORATION. Search for top quark decays t → qH , with H → γγ, in √s = 13 TeV pp collisions using the ATLAS detector. In: Journal of High Energy Physics, 2017, vol. 1710, p. 129-172. https://archive-ouverte.unige.ch/unige:98343

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Deposited on : 2017-11-01

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