Constraints on non-Standard Model Higgs boson interactions in an effective Lagrangian using differential cross sections measured in the $H \rightarrow \gamma\gamma$ decay channel at $\sqrt{s} = 8$ TeV with the ATLAS detector

Understand

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.