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Search for top quark decays $t \to qH$, with $H \to\gamma\gamma$, in $ \sqrt{s}$ = 13 TeV pp collisions using the ATLAS detector
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Search for top quark decays $t \to qH$, with $H \to\gamma\gamma$, in $ \sqrt{s}$ = 13 TeV pp collisions using the ATLAS detector

M. Aaboud, G. Aad, B. Abbott, O. Abdinov, B. Abeloos, S. H. Abidi, O. S. AbouZeid, N. L. Abraham, H. Abramowicz, H. Abreu, …
Deutsches Elektronen-Synchrotron, DESY, Hamburg
2017
DOI: https://doi.org/10.3204/pubdb-2017-13298

摘要

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 $2.4 \times 10^{-3}$.

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