CP Violation in Heavy MSSM Higgs Scenarios

TL;DR

This paper investigates new heavy Higgs scenarios within the MSSM with explicit CP violation, analyzing their phenomenological implications at the LHC and how CP-violating effects influence heavy Higgs boson behavior.

Contribution

It introduces and explores new MSSM heavy Higgs scenarios with explicit CP violation, including improved calculations of Higgs masses and phenomenology.

Findings

CP-violating effects can significantly alter heavy Higgs phenomenology.

New benchmark scenarios CPX4LHC demonstrate non-decoupling CP violation.

Heavy Higgs sector effects remain consistent with low-energy constraints.

Abstract

We introduce and explore new heavy Higgs scenarios in the Minimal Supersymmetric Standard Model (MSSM) with explicit CP violation, which have important phenomenological implications that may be testable at the LHC. For soft supersymmetry-breaking scales M_S above a few TeV and a charged Higgs boson mass M_H+ above a few hundred GeV, new physics effects including those from explicit CP violation decouple from the light Higgs boson sector. However, such effects can significantly alter the phenomenology of the heavy Higgs bosons while still being consistent with constraints from low-energy observables, for instance electric dipole moments. To consider scenarios with a charged Higgs boson much heavier than the Standard Model (SM) particles but much lighter than the supersymmetric particles, we revisit previous calculations of the MSSM Higgs sector. We compute the Higgs boson masses in the presence of CP violating phases, implementing improved matching and renormalization group (RG) effects, as well as two-loop RG effects from the effective two-Higgs Doublet Model (2HDM) scale M_H+ to the scale M_S. We illustrate the possibility of non-decoupling CP-violating effects in the heavy Higgs sector using new benchmark scenarios named CPX4LHC.