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Search for top quark decays t → qH with H → γγ using the ATLAS detector

CollaborationWith : Alexandre, Gauthier / Ancu, Lucian Stefan / Barone, Gaetano / Bell, Paul / Bell, William / Benhar Noccioli, Eleonora / Bilbao De Mendizabal, Javier / Bucci, Francesca / Camacho Toro, Reina / Clark, Allan Geoffrey / Delitzsch, Chris Malena / Della Volpe, Domenico / Doglioni, Caterina / Ferrere, Didier / Gadomski, Szymon / Gonzalez Sevilla, Sergio / Goulette, Marc / Gramling, Johanna Léna / Guescini, Francesco / Iacobucci, Giuseppe / Katre, Akshay / La Rosa, Alessandro / Mermod, Philippe / Miucci, Antonio / Muenstermann, Daniel / Nektarijevic, Snezana / Nikolics, Katalin / Picazio, Attilio / Pohl, Martin / Rosbach, Kilian / Vallecorsa, Sofia / Wu, Xin
Published in Journal of High Energy Physics. 2014, vol. 1406, p. 008-48
Collection Open Access - SCOAP3
Abstract 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 20.3fb −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 $ \sqrt{{\lambda_{tcH}^2 + \lambda_{tuH}^2}} $ is 0.17.
Keywords Hadron-Hadron Scattering
arXiv: 1403.6293
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ATLAS COLLABORATION. Search for top quark decays t → qH with H → γγ using the ATLAS detector. In: Journal of High Energy Physics, 2014, vol. 1406, p. 008-48. doi: 10.1007/JHEP06(2014)008 https://archive-ouverte.unige.ch/unige:55799

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Deposited on : 2015-04-27

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