Neutralino dark matter in the extension of MSSM with two triplets and singlet

TL;DR

This paper explores the TNMSSM model, an extension of MSSM with two triplets and a singlet, showing that it can naturally produce a bino-like neutralino dark matter candidate consistent with experimental constraints and detectable in future experiments.

Contribution

It introduces the TNMSSM model with seven neutralinos, demonstrating its potential to explain dark matter relic density and solve the $$ problem, with predictions testable by upcoming experiments.

Findings

Bino-like neutralino with mass 100-450 GeV can account for dark matter relic density.

Most of the parameter space is testable by Xenon-nT and LHC.

The model naturally addresses the $$ problem and fits experimental constraints.

Abstract

In an extension of MSSM with two triplets and a singlet, called the TNMSSM, there are seven neutralinos which can enrich the study of cold dark matter if one expects that the weakly interacting massive particle (WIMP) is responsible for the observation of Planck satellite. Such a model, compared to the MSSM, can naturally offer a solution to the $\mu$ problem, and its lightest neutralino, which is bino-like, can also provide a correct relic density by using the coannihilation mechanism due to the newly added triplinos. Taking into account the related experimental measurements, such as the bound on the SM-like Higgs mass, the $B$ meson rare decays, the anomalous magnetic moment of the muon $a_\mu$, the Large Hadron Collider (LHC) measurements and the latest dark matter direct detection experiment LUX-ZEPLIN (LZ), the TNMSSM parameter space can be strictly limited. In respect to all the constraints mentioned above, we find that a bino-like neutralino with a mass in the region $[100, 450]~\rm{GeV}$ can successfully account for the correct dark matter relic density. Additionally, most of the viable parameter space can be tested in the near future experiments such as the Xenon-nT experiment or LHC.