Measurement of fiducial, differential and production cross sections in the $H \rightarrow \gamma \gamma$ decay channel with ATLAS

Measurements of differential (in the fiducial phase space) and production mode cross sections are presented in the $H\rightarrow\gamma\gamma$ decay channel using 36~fb$^{-1}$ data collected by the ATLAS detector at a centre of mass energy of $\sqrt{s}=13$~TeV. These characterise $pp\rightarrow H\rightarrow\gamma\gamma$ processes in a variety of ways; production mode cross sections directly test the compatibility of the data with the Standard Model (SM), whereas fiducial measurements make minimal SM assumptions and can thus be re-interpreted in order to constrain new physics models which change event topologies and kinematic distributions. The sensitivity is approximately double that of the $\sqrt{s}=8$~TeV dataset. Five differential distributions are used to constrain Wilson coefficients using the effective field theory approach.