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The measurement of the Yukawa coupling of the top quark is one important goalof particle physics after the discovery of the Higgs boson. There are twoprocesses that offer the possibility to directly measure the Yukawa coupling ofthe top quark at the LHC. These are the production of a top-antitop-quark pairin association with a Higgs boson via the strong interaction ($t\bar{t}H$) andthe electroweak production of a single top quark and a Higgs boson ($tH$). Inthe Standard Model, the cross section for $tH$ production is much smaller thanthe cross section for $t\bar{t}H$ production as there is a destructiveinterference between diagrams where the Higgs boson is radiated off a top quarkand diagrams where it is radiated off a $W$ boson. Despite the reduced crosssection, this interference provides additional sensitivity to the sign of theYukawa coupling.  The considered Higgs boson decay into photons is promising due to the goodenergy resolution of the photons and the relatively small backgrounds. But itis also challenging due to the small branching ratio.  The analysis strategy and the latest results on the search for $t\bar{t}H/tH$production in the diphoton channel at the ATLAS experiment are presented.

Search for $t\bar{t}H$ and $tH$ production with $H\to \gamma \gamma$ at $\sqrt{s}$ = 13 TeV with the ATLAS experiment