Searching for Singlino-Higgsino Dark Matter in the NMSSM

TL;DR

This paper investigates the detection prospects of singlino-higgsino dark matter within the NMSSM, analyzing collider and dark matter experiments' sensitivities to various parameter regions.

Contribution

It provides a detailed analysis of collider and dark matter detection sensitivities for singlino-higgsino dark matter in a simplified NMSSM scenario with a split electroweak spectrum.

Findings

LHC searches can probe neutralino masses up to 150-230 GeV.

Future dark matter experiments can explore parameter regions beyond collider reach.

Collider and dark matter searches are complementary in probing the model.

Abstract

We study a simplified scenario in the next-to-minimal supersymmetric standard model with a split electroweak spectrum, in which only the singlino and higgsinos are light and other superpartners are decoupled. Serving as a dark matter candidate, a singlino-dominated neutralino $\tilde{\chi}_1^0$ should have either resonant annihilation effects or sizable higgsino components to satisfy the observed relic abundance. The sensitivities of LHC searches and dark matter detection experiments are investigated. With an integrated luminosity of $30 (300) \mathrm{fb}^{-1}$, $3l + E_\mathrm{T} \!\!\!\!\!\!\!/ \;\;\;$and $2l + E_\mathrm{T} \!\!\!\!\!\!\!/ \;\;\;$ searches at the 13 (14) TeV LHC are expected to reach up to $m_{\tilde{\chi}_1^0}\sim 150 (230) \mathrm{GeV}$ and $m_{\tilde{\chi}_2^0,\tilde{\chi}_1^{\pm}}\sim 320 (480) \mathrm{GeV}$. Near future dark matter direct and indirect detection experiments can cover some parameter regions where collider searches lose their sensitivities.