Implications of Sgr A$^\ast$ on the $\gamma$-rays searches of Bino Dark Matter with $(g-2)_\mu$

TL;DR

This paper investigates how a dark matter density spike around the Milky Way's supermassive black hole affects gamma-ray searches for Bino-dominated neutralino dark matter in the MSSM, especially in light of muon g-2 anomalies.

Contribution

It introduces the impact of the Sgr A* density spike on gamma-ray detection prospects for Bino-like dark matter within the MSSM, considering the effects of compressed spectra and coannihilations.

Findings

Density spike enhances gamma-ray signals, improving detection prospects.

Boost factors are calculated for Fermi-LAT and HESS observations.

Bino-dominated DM remains challenging to detect at LHC and direct detection.

Abstract

We analyse the impact of dark matter density spike around the Milky Way's supermassive black hole (SMBH), Sgr A$^*$, in probing the Bino-dominated neutralino dark matter (DM) $\tilde \chi_1^0$ within the MSSM, which typically produces relatively faint signals in the conventional DM halos. In particular, we explore the indirect search prospects of sub-TeV Bino-Higgsino and Bino-Wino-Higgsino DM in the MSSM, consistent with the supersymmetric predictions required to explain the anomalous magnetic moment of the muon. Typical over-abundance of Bino DM is ameliorated with slepton and/or Wino coannihilations. The lightest neutralino, thus, may be associated with a compressed supersymmetric particle spectrum, which, in general, is difficult to probe at conventional LHC searches. Similarly, for a rather tiny Higgsino mixing, $\tilde \chi_1^0$ does not offer much prospect to assess its predictions at dark matter direct detection searches. Accommodating the inclusive effects of density spike, here, we present the requisite boost factor to facilitate $\gamma-$ray searches of Bino-dominated DM in the MSSM, especially focusing on the Fermi-LAT and HESS observations.