# Scalar neutrino dark matter in $U(1)_X$SSM

## TL;DR

This paper explores the $U(1)_X$SSM extension of the MSSM, focusing on the lightest CP-even sneutrino as a dark matter candidate, analyzing its relic density and scattering cross section to match observational constraints.

## Contribution

It introduces the $U(1)_X$SSM model with additional singlet Higgs and right-handed neutrinos, and studies the sneutrino dark matter properties within this framework.

## Key findings

- Sneutrino relic density matches observational data.
- Sneutrino-nucleon scattering cross section is within experimental limits.
- Model parameters can satisfy dark matter constraints.

## Abstract

$U(1)_X$SSM is the extension of the minimal supersymmetric standard model(MSSM) and its local gauge group is $SU(3)_C\times SU(2)_L \times U(1)_Y \times U(1)_X$. To obtain this model, three singlet new Higgs superfields and right-handed neutrinos are added to MSSM. In the framework of $U(1)_X$SSM, we study the Higgs mass and take the lightest CP-even sneutrino as a cold dark matter candidate. For the lightest CP-even sneutrino, the relic density and the cross section for dark matter scattering off nucleon are both researched. In suitable parameter space of the model, the numerical results satisfy the constraints of the relic density and the cross section with the nucleon.