Measurement of the properties of Higgs boson production in the di-photon channel using 139 $fb^{−1}$ of pp collision data with the ATLAS experiment

Precision measurement of Higgs boson production and decay rates is one of the most important tasks after the Higgs boson discovery at the LHC in 2012. In this presentation, I will report inclusive cross section measurements for the dominant Higgs boson production modes, as well as Simplified Template Cross Sections, in the di-photon decay channel using 139 $fb^{-1}$ of $pp$ collision data collected by the ATLAS experiment during 2015-2018. I will also discuss how the measurements constrain the Higgs boson couplings to other particles in the Standard Model.