CP-odd component of the lightest neutral Higgs boson in the MSSM

TL;DR

This paper investigates the potential CP-odd component of the lightest neutral Higgs boson in the MSSM, analyzing constraints from experiments and exploring how CP-violation could manifest in Higgs properties detectable at the LHC.

Contribution

It provides a detailed analysis of the size of the CP-odd component in the lightest Higgs within the MSSM and discusses experimental tests at the LHC for CP-violation effects.

Findings

Constraints from Higgs and electric dipole moment measurements limit CP-violation.

The CP-odd component can be sizable under certain parameter conditions.

Potential signatures of CP-violation could be observed at the LHC.

Abstract

The Higgs sector of the Minimal Supersymmetric Extension of the Standard Model may be described with a two Higgs doublet model with properties that depend on the soft supersymmetry breaking parameters. For instance, flavor independent CP-violating phases associated with the gaugino masses, the squark trilinear mass parameters and the Higgsino mass parameter $\mu$ may lead to sizable CP-violation in the Higgs sector. For these CP-violating effects to affect the properties of the recently observed SM-like Higgs resonance, the non-standard charged and neutral Higgs bosons masses must be of the order of the weak scale, and both $\mu$ as well as the trilinear stop mass parameter $A_t$ must be of the order or larger than the stop mass parameters. Constraints on this possibility come from direct searches for non-standard Higgs bosons, precision measurements on the lightest neutral Higgs properties, including its mass, and electric dipole moments. In this article, we discuss these constraints within the MSSM, trying to evaluate the possible size of the CP-odd component of the lightest neutral Higgs boson, and the possible experimental tests of this CP-violating effect at the LHC.