  The strength and tensor structure of the Higgs boson's interactions are
investigated within an effective field theory framework, which allows new
CP-even and CP-odd interactions that can lead to changes in the kinematic
properties of the Higgs boson and associated jet spectra. The parameters of the
effective field theory are probed using a fit to five differential cross
sections previously measured by the ATLAS experiment in the $H \rightarrow
\gamma\gamma$ decay channel with an integrated luminosity of 20.3 fb$^{-1}$ at
$\sqrt{s}=8$ TeV. In order to perform a simultaneous fit to the five
distributions, the statistical correlations between them are determined by
re-analysing the $H \rightarrow \gamma\gamma$ candidate events in the
proton-proton collision data. No significant deviations from the Standard Model
are observed and limits on the effective field theory parameters are derived.
The statistical correlations are made publicly available to allow for future
analysis of theories with non-Standard Model interactions.
