The CMSSM Survives Planck, the LHC, LUX-ZEPLIN, Fermi-LAT, H.E.S.S. and IceCube

TL;DR

This paper reassesses the constrained minimal supersymmetric Standard Model (CMSSM) viability by analyzing its parameter space against recent experimental constraints from Planck, LHC, LUX-ZEPLIN, Fermi-LAT, H.E.S.S., and IceCube, finding that significant regions remain compatible, especially with Higgsino-like dark matter around 1000 GeV.

Contribution

It provides a detailed mapping of CMSSM parameter space compatible with multiple recent experimental constraints, highlighting the most restrictive bounds and the nature of surviving dark matter candidates.

Findings

Most constraints come from Higgs mass measurements and LZ limits.

Surviving parameter space features Higgsino-like dark matter around 1000-1100 GeV.

Sparticle searches are less restrictive than direct and Higgs mass constraints.

Abstract

We revisit the viability of the CMSSM, searching for regions of parameter space that yield a neutralino dark matter density compatible with Planck measurements, as well as LHC constraints including sparticle searches and the mass of the Higgs boson, recent direct limits on spin-independent and -dependent dark matter scattering from the LUX-ZEPLIN (LZ) experiment, the indirect constraints from Fermi-LAT and H.E.S.S. on dark matter annihilations to photons in dwarf spheroidal galaxies and the Galactic Centre, and the IceCube limits on muons from annihilations to neutrinos in the Sun. For representative values of $\tan \beta$ and $A_0$ we map in detail the Planck-compatible strips in CMSSM parameter planes, which exhibit multiple distinctive features for large $\tan \beta$, $A_0 = 0$ and $\mu > 0$, and identify portions of the strips that survive all the phenomenological constraints. We find that the most powerful constraint is that from $m_h$, followed by the LZ limit on spin-independent scattering, whereas sparticle searches at the LHC and indirect dark matter searches are less restrictive. Most of the surviving CMSSM parameter space features a Higgsino-like dark matter particle with a mass $\sim 1000-1100$ GeV, which could best be probed with future direct searches for dark matter scattering.