Dark Matter in the MSSM Golden Region

TL;DR

This paper investigates dark matter properties within the MSSM's golden region, focusing on neutralino composition and parameter constraints that align with experimental and cosmological data.

Contribution

It identifies the characteristics of neutralino dark matter in the MSSM golden region under experimental constraints, highlighting the gaugino dominance and specific mass bounds.

Findings

Neutralinos with relic density matching cosmological data are gaugino-dominated.

The U(1)_Y gaugino mass parameter M_1 must be less than 300 GeV.

The golden region satisfies experimental bounds and minimizes fine-tuning.

Abstract

Dark matter is examined within the ``golden region'' of the Minimal Supersymmetric Standard Model. This region satisfies experimental constraints, including a lower bound on the Higgs mass of 114 GeV, and minimizes fine-tuning of the Z boson mass. Here we impose additional constraints (particularly due to experimental bounds on $b\to s \gamma$). Then we find the properties of the Dark Matter in this region. Neutralinos with a relic density that provides the amount of dark matter required by cosmological data are shown to consist of a predominant gaugino (rather than higgsino) fraction. In addition, the U(1)$_Y$ gaugino mass parameter must satisfy $M_1 < 300$ GeV.