SUSY Higgs bosons and beyond

TL;DR

This paper explores extensions of the MSSM that include weakly interacting extra degrees of freedom, which can modify Higgs properties and collider phenomenology, potentially resolving tensions in Higgs mass bounds.

Contribution

It introduces a BMSSM framework using effective field theory to analyze Higgs sector modifications beyond the MSSM, including mass, couplings, and decay calculations.

Findings

Collider phenomenology differs significantly from SM and MSSM.

Higgs mass and coupling predictions are altered by BMSSM effects.

The approach includes corrections up to order 1/M^2.

Abstract

We consider extensions of the Minimal Supersymmetric Standard Model (MSSM) where the extra degrees of freedom interact weakly with the Higgs sector. These models allow to relax the tension between the lower bound on the lightest CP even Higgs mass from direct LEP searches and the theoretical upper bound of the MSSM. We study the beyond MSSM (BMSSM) effects via an effective field-theory approach, assuming that the MSSM is valid up to a heavy physics scale M. We compute the masses, couplings and branching fractions of the Higgs sector, including all the relevant corrections up to order 1/M^2. We find that the collider phenomenology can be greatly different with respect to both the SM and the MSSM.