Supersymmetry without a light Higgs boson but with a light pseudoscalar

TL;DR

This paper explores a lambda-SUSY model variant where a light pseudoscalar exists without a light Higgs, affecting decay patterns and LHC phenomenology, challenging traditional supersymmetry expectations.

Contribution

It introduces a parameter space in lambda-SUSY allowing a light pseudoscalar, altering Higgs decay signatures and LHC search strategies.

Findings

Light pseudoscalar can be relatively light in certain parameter regions.

Unusual decay patterns of CP-even Higgs bosons are predicted.

Implications for LHC phenomenology and supersymmetry searches.

Abstract

We consider the lambda-SUSY model, a version of the NMSSM with large lambda H_1 H_2 S coupling, relaxing the approximation of large singlet mass and negligible mixing of the scalar singlet with the scalar doublets. We show that there are regions of the parameter space in which the lightest pseudoscalar can be relatively light, with unusual consequences on the decay pattern of the CP-even Higgs bosons and thus on the LHC phenomenology.