New observable for measuring the CP property of top-Higgs interaction

We propose a new dihedral angle observable for measuring the CP property of the interaction between the top quark and Higgs boson in t (t) over barH production at the 14 TeV Large Hadron Collider (LHC). We consider two decay modes of the Higgs boson, H -> b (b) over bar and H -> gamma gamma, and demonstrate that the dihedral angle distribution is able to distinguish between the CP-even and the CP-odd hypothesis at a 95% confidence level, with an integrated luminosity of similar to 180 fb(-1).

Automated summary

A new dihedral angle observable has been proposed to measure the CP property of the interaction between the top quark and Higgs boson in t (t) over barH production at the 14 TeV Large Hadron Collider (LHC). By considering two decay modes of the Higgs boson, H -> b (b) over bar and H -> gamma gamma, it has been demonstrated that the dihedral angle distribution can distinguish between the CP-even and CP-odd hypothesis at a 95% confidence level with an integrated luminosity of about 180 fb(-1).