# Is well-tempered neutralino in MSSM still alive after 2016 LUX results?

## TL;DR

This paper examines the viability of well-tempered neutralinos in the MSSM after 2016 LUX results, identifying constrained parameter regions that will be tested by future experiments.

## Contribution

It provides updated constraints on the MSSM parameter space for well-tempered neutralinos considering recent LUX and LHC results, highlighting the remaining viable regions.

## Key findings

- LUX constraints limit bino-dominated neutralinos to small tanβ (<3) unless non-SM Higgs are light.
- Heavy stop masses (>25 TeV) are required for certain parameter regions to satisfy constraints.
- Future experiments will probe the small remaining viable parameter space.

## Abstract

It is pointed out that a bino-dominated well-tempered bino-higgsino in the Minimal Supersymmetric Standard Model (MSSM) with heavy non-SM- like scalars can satisfy the 2016 LUX constraints on the scattering cross-section of dark matter on nuclei only if $\tan\beta$ is smaller than about 3. This, together with the Higgs mass constraint, sets a lower bound on the stops masses of about 25 TeV. The LUX constraints can be satisfied for larger $\tan\beta$ if the non-SM-like Higgs bosons are light enough. However, this region of parameter space is strongly constrained by recent LHC results of the Higgs boson searches. Satisfying both the LUX and LHC constraints requires the non-SM-like Higgs bosons to be lighter than about 400 GeV and $\tan\beta$ below about 8. This implies a lower bound on the stop masses of about 1.5 TeV. This small corner of the parameter space will be probed in the near future by the direct detection experiments, the LHC Higgs searches and precision Higgs coupling measurements. The recent LUX constraints improved also the lower mass limit on higgsino-dominated well-tempered neutralino to about 950 (900) GeV with heavy (light) MSSM-like Higgs doublet, assuming the stop masses below 10 TeV.