Combined Analysis of the CP Properties of The Higgs Boson in Effective Higgs Lagrangian

TL;DR

This paper investigates the CP properties of the Higgs boson by analyzing CP violation effects from interactions and state ambiguity, using an effective Lagrangian approach constrained by unitarity and experimental data.

Contribution

It introduces a coherent framework to study Higgs CP violation sources and classifies scenarios based on these sources, incorporating experimental constraints.

Findings

Constraints from unitarity limits restrict Higgs couplings.

Allowed CPV parameter ranges are derived from LHC signal strength data.

Five cases of CPV sources are classified and analyzed.

Abstract

CP violation effects of the Higgs stem from not only CP-violation interactions but also an ambiguous defined CP state. The two CPV sources are coherently studied based on an effective Higgs Lagrangian. The constraints from unitarity limits for $WW$ and $ZZ$ scatterings are proposed to restrict Higgs couplings to weak gauge bosons. Five interesting cases are classified in terms of CPV sources to investigate the Higgs CP properties. The allowed ranges are shown from fitting results to the signal strengths of the Higgs measured by ATLAS and CMS.