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

Collaboration, ATLAS (2017) Search for top quark decays t → qH, with H → γγ, in s√=13 TeV pp collisions using the ATLAS detector. JHEP 10(2017) 129, 2017 (10). 129-.

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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 $\sqrt{s} = 13$ 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 $t \rightarrow cH$ branching ratio of $2.2\times 10^{-3}$ at the 95% confidence level, while the expected limit in the absence of signal is $1.6 \times 10^{-3}$. The corresponding limit on the $tcH$ coupling is 0.090 at the 95% confidence level. The observed upper limit on the $t \rightarrow uH$ branching ratio is $2.4 \times 10^{-3}$.

Item Type:	Article
Additional Information:	41 pages in total, author list starting page 25, 7 figures, 3 tables, submitted to JHEP. All figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2016-26/
Uncontrolled Keywords:	hep-ex, hep-ex
Depositing User:	Symplectic Admin
Date Deposited:	12 Sep 2018 08:13
Last Modified:	18 Mar 2024 04:13
DOI:	10.1007/JHEP10(2017)129
Open Access URL:	https://link.springer.com/content/pdf/10.1007/JHEP...
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3026015