Dark Matter in Gauge Mediation from Emergent Supersymmetry

TL;DR

This paper explores the potential of neutralino dark matter within a gauge mediation framework derived from emergent supersymmetry, highlighting unique spectral features and viable parameter space consistent with observational constraints.

Contribution

It introduces a novel gauge mediation model with emergent supersymmetry where the neutralino is the lightest supersymmetric particle and dark matter candidate, with detailed spectral analysis and phenomenological constraints.

Findings

Neutralino can be viable dark matter in this model.

The spectrum is nearly gauge-mediated but with mSUGRA-like features.

Parameter space is constrained by relic density and collider bounds.

Abstract

We investigated the viability of neutralino dark matter in the gauge mediation from emergent supersymmetry proposal. In this proposal, supersymmetry is broken at Planck scale and consequently, the gravitino is superheavy and completely decouples from the low energy theory. Squarks and sleptons obtain their soft masses dominantly through gauge mediation with other mechanisms highly suppressed. The lightest supersymmetric partner, in contrast to traditional gauge mediation, is a neutralino which is also a dark matter candidate. By explicit calculation of the low energy spectra, the parameter space was constrained using the WMAP observed relic density of dark matter, LEP2 Higgs mass bounds, collider bounds on supersymmetric partners and exotic B-meson decays. We found that the model has intriguing hybrid features such as a nearly gauge-mediated spectrum (the exception being the superheavy gravitino) but with a dominant mSUGRA-like bino-stau coannihilation channel and at large $\tan \beta$, A-resonance-like annihilation.