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 ��� = 7TeV and 20.3fb-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 ��� qH branching ratio of 0.79 at the 95% confidence level. The corresponding limit on the tqH coupling combination ��tcH 2 + ��tuH 2 is 0.17. �� 2014 The Author(s).
Search for top quark decays t ��� qH with H ��� ���� using the ATLAS detector / Aad, G; Aloisio, Alberto; Alviggi, Mariagrazia; Canale, Vincenzo; Chiefari, Giovanni; DELLA VOLPE, Domenico; Merola, Leonardo; Conventi, Francesco; DELLA PIETRA, Massimo; Giordano, Raffaele; Rossi, Elvira; SANCHEZ PINEDA, ARTURO RODOLFO; Carlino, Gianpaolo; de Asmundis, Riccardo; Di Donato, Camilla; Doria, Alessandra; Iengo, Paolo; Izzo, Vincenzo; Sekhniaidze, Givi; Et, Al. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1126-6708. - 06:008(2014), pp. 1-39. [10.1007/JHEP06(2014)008]
Search for top quark decays t ��� qH with H ��� ���� using the ATLAS detector
ALOISIO, ALBERTO;ALVIGGI, MARIAGRAZIA;CANALE, VINCENZO;CHIEFARI, GIOVANNI;DELLA VOLPE, DOMENICO;MEROLA, LEONARDO;DELLA PIETRA, MASSIMO;GIORDANO, RAFFAELE;Rossi, Elvira;SANCHEZ PINEDA, ARTURO RODOLFO;
2014
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 ��� = 7TeV and 20.3fb-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 ��� qH branching ratio of 0.79 at the 95% confidence level. The corresponding limit on the tqH coupling combination ��tcH 2 + ��tuH 2 is 0.17. �� 2014 The Author(s).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
