Enhanced $h\rightarrow \gamma \gamma$ rate in MSSM singlet extensions

TL;DR

This paper investigates how singlet extensions of the MSSM can naturally enhance the Higgs to diphoton decay rate through light charginos and charged Higgs contributions, offering an alternative to fine-tuned scenarios.

Contribution

It demonstrates that singlet extensions of the MSSM can explain the enhanced diphoton rate with less fine-tuning than previous MSSM-based models.

Findings

Light charginos and charged Higgs significantly increase the diphoton decay rate.

The model provides a natural explanation for experimental hints of enhanced Higgs to gamma gamma.

Contrasts with the light stau scenario requiring fine-tuning.

Abstract

We study the di-photon rate in Higgs decays within singlet extensions of the supersymmetric standard model. In particular we point out that light charginos as well as a light charged Higgs can significantly contribute to the corresponding partial decay width, allowing for an explanation of the experimental indication whithin a natural supersymmetric model. This is in contrast to the `light stau scenario' proposed within the framework of the MSSM which requires a large amount of electroweak fine tuning.