An alternative NMSSM phenomenology with manifest perturbative unification

TL;DR

This paper explores a variant of the NMSSM that maintains perturbative unification with a moderate stop mass, featuring a Peccei-Quinn symmetry and distinctive Higgs and neutralino decay phenomenology.

Contribution

It provides an analytic description of a constrained NMSSM near a Peccei-Quinn symmetry point with manifest perturbative unification and detailed phenomenological implications.

Findings

Consistent NMSSM with moderate stop mass and perturbative unification.

Presence of a pseudo-Goldstone boson affecting Higgs and neutralino decays.

Distinct decay channels into b anti-b and tau anti-tau.

Abstract

Can supersymmetric models with a moderate stop mass be made consistent with the negative Higgs boson searches at LEP, while keeping perturbative unification manifest? The NMSSM achieves this rather easily, but only if extra matter multiplets filling complete SU(5) representations are present at intermediate energies. As a concrete example which makes use of this feature, we give an analytic description of the phenomenology of a constrained NMSSM close to a Peccei-Quinn symmetry point. The related pseudo-Goldstone boson appears in decays of the Higgs bosons and possibly of the lightest neutralino, and itself decays into (b anti-b) and (tau anti-tau).