Light right-handed Smuons at the LHC: Natural dark matter and $g_{\mu}-2$ in an unexplored realm of the pMSSM

TL;DR

This paper explores a natural and previously unexamined region of the pMSSM parameter space, called the 'bulk', featuring light neutralinos and smuons, which can explain dark matter and muon g-2 measurements while being consistent with current collider constraints.

Contribution

It identifies and analyzes the 'bulk' region of the pMSSM, demonstrating its compatibility with dark matter, muon g-2, and collider data, and discusses its testability at upcoming experiments.

Findings

The 'bulk' region includes sub 200 GeV neutralinos and right-handed smuons.

It satisfies recent muon g-2 measurements and collider constraints.

Future experiments like LUX-ZEPLIN, LHC Run 3, FCC-ee, and CEPC can probe this region.

Abstract

We introduce an in-depth study of an unprobed pMSSM region offering a natural solution to dark matter. Since the 1980s this region has been referred to as the "bulk", consisting of sub 200 GeV neutralinos and right-handed smuons. The bulk satisfies recent muon $g_{\mu}-2$ measurements and sustains consistency with $all$ presently operating SUSY experiments and LHC constraints. Initial ingress into the bulk will arrive soon via the LUX-ZEPLIN 1000-day experiment. The ATLAS Collaboration at the LHC has confirmed that observation of these light right-handed smuon events can occur at the ongoing LHC Run 3 and forthcoming High-Luminosity LHC. Moreover, the future FCC-ee and CEPC circular colliders should handily observe the events.