Detecting underabundant neutralinos

TL;DR

This paper explores how underabundant neutralinos in the MSSM can be detected through direct detection experiments and collider searches, revealing that current and future experiments will probe most of the viable parameter space.

Contribution

It systematically analyzes electroweakino patterns with underabundant neutralinos, highlighting the potential of direct detection and collider experiments to explore this parameter space.

Findings

Direct detection experiments are sensitive to underabundant neutralinos despite flux rescaling.

Mass differences between NLSP and LSP are constrained to less than 40 GeV (or 10 GeV) by relic abundance and experimental limits.

Future experiments will cover almost the entire viable neutralino mass spectrum.

Abstract

The electroweak sector may play a crucial role in discovering supersymmetry. We systematically investigate the patterns of the MSSM-like electroweakinos, when the neutralino relic abundance $\Omega_\chi h^2\leq 0.12$, that is, also admitting for multi-component Dark Matter, in a broad range of the parameter space. We find that for a very large range of parameters the Direct Detection experiments are/will be sensitive to underabundant neutralinos, in spite of the strong rescaling of the flux factor. The second general conclusion is that the bound $\Omega_\chi h^2\leq 0.12$ together with the LUX (XENON1T) limits for the neutralino spin independent scattering cross sections constrain the electroweakino spectrum so that the mass differences between the NLSP and the LSP are smaller than 40 (10) GeV, respectively, with important implications for the collider searches. The future Direct Detection experiments and the high luminosity LHC run will probe almost the entire range of the LSP and NLSP mass spectrum that is consistent with the bound $\Omega_\chi h^2\leq 0.12$.