Extending the MSSM with singlet Higgs and right handed neutrino for the self-interacting dark matter

TL;DR

This paper extends the GNMSSM by adding a singlet Higgs and right-handed neutrino to explain self-interacting dark matter while satisfying BBN constraints, analyzing the spectrum, Feynman rules, and dark matter phenomenology.

Contribution

It introduces a novel extension of the GNMSSM with right-handed neutrinos to address dark matter relic abundance and cosmological constraints.

Findings

Singlet sector explains dark matter relic abundance in certain parameter regimes.

BBN constraints are satisfied via decay to right-handed neutrinos.

Mediator mass constrained to a few MeV for specific coupling values.

Abstract

In order to meet the requirement of BBN, the right handed neutrino is added to the singlet Higgs sector in the GNMSSM. The spectrum and Feynman rules are calculated. the dark matter phenomenology is also studied. In case of $\l\sim 0$, the singlet sector can give perfect explanation of relic abundance of dark matter and small cosmological structure simulations. The BBN constraints on the light mediator can be easily solved by decaying to the right handed neutrino. When the $\l_N$ is at the order of $\mathcal{O}(0.1)$, the mass of the mediator can be constrained to several MeV