PandaX limits on light dark matter with light mediator in the singlet extension of MSSM

TL;DR

This paper analyzes PandaX experimental limits on light dark matter with a light mediator within the singlet extension of MSSM, constraining the parameter space and implications for dark matter properties and self-interaction.

Contribution

It provides the first detailed constraints from PandaX data on the parameter space of singlet extensions of MSSM, including the NMSSM, considering dark matter self-interactions.

Findings

PandaX limits strongly constrain the singlet extension parameter space.

In NMSSM, GeV dark matter with sub-GeV mediator is tightly constrained.

Constraints depend on the coupling between singlet and doublet Higgs fields.

Abstract

Using the latest PandaX limits on light dark matter (DM) with light mediator, we check the implication on the parameter space of the general singlet extension of MSSM (without $Z_3$ symmetry), which can have a sizable DM self-interaction to solve the small-scale structure problem. We find that the PandaX limits can stringently constrain such a paramter space, depending on the coupling $\lambda$ between the singlet and doublet Higgs fields. For the singlet extension of MSSM with $Z_3$ symmetry, the so-called NMSSM, we also demonstrate the PandaX constraints on its parameter space which gives a light DM with correct relic density but without sufficient self-interaction to solve the small-scale structure problem. We find that in this NMSSM the GeV dark matter with a sub-GeV mediator has been stringently constrained.