Yukawa Unification and Neutralino Dark Matter in SU(4)_c \times SU(2)_L \times SU(2)_R

TL;DR

This paper explores a supersymmetric left-right symmetric model where non-universal gaugino masses enable Yukawa unification and consistent neutralino dark matter, with implications for collider experiments and specific particle mass predictions.

Contribution

It demonstrates that Yukawa unification is compatible with neutralino dark matter in a 4-2-2 model using non-universal gaugino masses, and identifies benchmark points with low stau and stop masses.

Findings

Gluino co-annihilation significantly affects neutralino relic density.

Yukawa unification is achievable with non-universal gaugino masses.

Benchmark points with low stau and stop masses are identified.

Abstract

We consider a left-right symmetric SU(4)_c \times SU(2)_L \times SU(2)_R (4-2-2) model with gravity mediated supersymmetry breaking. We find that with 4-2-2 compatible non-universal gaugino masses, t-b-\tau Yukawa coupling unification is consistent with neutralino dark matter abundance and with constraints from collider experiments (except (g-2)_{\mu}). The gluino mass lies close to that of the lightest neutralino, so that the gluino co-annihilation channel plays an important role in determining the neutralino relic abundance. By relaxing the Yukawa unification constraint we find stau and stop masses as low as 200-220 GeV. We highlight some benchmark points for these cases with 40 < \tan\beta < 58.