Properties of 125 GeV Higgs boson in non-decoupling MSSM scenarios

TL;DR

This paper investigates non-decoupling MSSM scenarios where the 125 GeV Higgs boson exhibits enhanced or suppressed decay rates, exploring implications for collider phenomenology and potential deviations from the Standard Model.

Contribution

It identifies specific MSSM parameter regions where the 125 GeV Higgs has altered decay rates, providing new insights into non-decoupling effects and experimental signatures.

Findings

Enhanced gamma gamma decay via light stau contribution.

Suppressed bottom quark decay with increased WW/ZZ rates.

Distinct collider signatures including top decays and Higgs production.

Abstract

Tantalizing hints of the Higgs boson of mass around 125 GeV have been reported at the LHC. We explore the MSSM parameter space in which the 125 GeV state is identified as the heavier of the CP even Higgs bosons, and study two scenarios where the two photon production rate can be significantly larger than the standard model (SM). In one scenario, $\Gamma(H\to \gamma\gamma)$ is enhanced by a light stau contribution, while the $WW^{\ast}$ ($ZZ^{\ast}$) rate stays around the SM rate. In the other scenario, $\Gamma(H\to b\bar{b})$ is suppressed and not only the $\gamma\gamma$ but also the $WW^{\ast}$ ($ZZ^{\ast}$) rates should be enhanced. The $\tau\bar{\tau}$ rate can be significantly larger or smaller than the SM rate in both scenarios. Other common features of the scenarios include top quark decays into charged Higgs boson, single and pair production of all Higgs bosons in $e^+e^-$ collisions at $\sqrt{s}\lesssim 300$ GeV.