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

Understand

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.