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Search for top quark decays t arrow right qH with H arrow right gamma gamma using the ATLAS detector

(ProQuest: ... denotes formulae and/or non-USASCII text omitted; see image).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 cor...

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Published in:The journal of high energy physics 2014-06, Vol.2014 (6), p.1-40
Main Authors: Aad, G, Abbott, B, Abdallah, J, Abdel Khalek, S, Abdinov, O, Aben, R, Abi, B, Abolins, M, AbouZeid, O S, Abramowicz, H, Abreu, H, Abreu, R, Abulaiti, Y, Acharya, B S, Adamczyk, L, Adams, D L, Adelman, J, Adomeit, S, Adye, T, Agatonovic-Jovin, T, Aguilar-Saavedra, JA, Agustoni, M, Ahlen, S P, Ahmad, A, Ahmadov, F, Aielli, G, Aakesson, TPA, Akimoto, G, Akimov, A V, Alberghi, G L, Albert, J, Albrand, S, Alconada Verzini, MJ, Aleksa, M, Aleksandrov, IN, Alexa, C, Alexander, G, Alexandre, G, Alexopoulos, T, Alhroob, M, Alimonti, G, Alio, L, Alison, J, Allbrooke, BMM, Allison, L J, Allport, P P, Allwood-Spiers, SE, Almond, J, Aloisio, A, Alonso, A, et. al
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Language:English
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Summary:(ProQuest: ... denotes formulae and/or non-USASCII text omitted; see image).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 super(-1) at ... = 7TeV and 20.3fb super(-1) at ... = 8TeV 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 arrow right qH branching ratio of 0.79 at the 95% confidence level. The corresponding limit on the tqH coupling combination ... is 0.17. [Figure not available: see fulltext.]
ISSN:1029-8479
DOI:10.1007/JHEP06(2014)008