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

Allbrooke, B M M, Asquith, L, Cerri, A, Chavez Barajas, C A, De Santo, A, Salvatore, F, Santoyo Castillo, I, Suruliz, K, Sutton, M, Vivarelli, I and The ATLAS Collaboration, (2014) Search for top quark decays t → qH with H → γγ using the ATLAS detector. Journal of High Energy Physics, 2014 (6). p. 8. ISSN 1029-8479

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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 √λ²tcH + λ²tuH is 0.17.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Research Centres and Groups: Experimental Particle Physics Research Group
Subjects: Q Science > QC Physics
Depositing User: Billy Wichaidit
Date Deposited: 05 May 2017 11:56
Last Modified: 05 May 2017 12:56
URI: http://sro.sussex.ac.uk/id/eprint/67706

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Project NameSussex Project NumberFunderFunder Ref
ATLASG0275STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCILST/I006048/1