Aspects of CP violation in the HZZ coupling at the LHC

TL;DR

This paper investigates CP violation effects in the HZZ coupling at the LHC by analyzing decay asymmetries and angular distributions, introducing new observables for enhanced sensitivity to CP-violating interactions.

Contribution

It provides analytical formulas for decay distributions and identifies novel observables to improve detection of CP violation in the HZZ coupling.

Findings

New asymmetries for CP violation detection

Analytical angular distribution formulas

Enhanced sensitivity observables for CPV

Abstract

We examine the CP-conserving (CPC) and CP-violating (CPV) effects of a general HZZ coupling through a study of the process H -> ZZ* -> 4 leptons at the LHC. We construct asymmetries that directly probe these couplings. Further, we present complete analytical formulae for the angular distributions of the decay leptons and for some of the asymmetries. Using these we have been able to identify new observables which can provide enhanced sensitivity to the CPV $H ZZ$ coupling. We also explore probing CP violation through shapes of distributions in different kinematic variables, which can be used for Higgs bosons with mH < 2 mZ.