Yukawa unification in SO(10) with light sparticle spectrum

TL;DR

This paper explores a supersymmetric SO(10) GUT model with negative , demonstrating that non-universal soft masses can achieve Yukawa unification, correct electroweak symmetry breaking, and align with experimental data, predicting relatively light sparticles.

Contribution

It shows how non-universal soft masses in SO(10) models with <0 can satisfy multiple experimental constraints and produce a light sparticle spectrum.

Findings

Achieves Yukawa unification with non-universal soft masses.

Identifies mechanisms for dark matter relic abundance consistent with WMAP.

Predicts light sparticles below 1.5 TeV, even for heavy superpartners.

Abstract

We investigate supersymmetric SO(10) GUT model with \mu<0. The requirements of top-bottom-tau Yukawa unification, correct radiative electroweak symmetry breaking and agreement with the present experimental data may be met when the soft masses of scalars and gauginos are non-universal. We show how appropriate non-universalities can easily be obtained in the SO(10) GUT broken to the Standard Model. We discuss how values of BR(b-->s \gamma) and (g-2)_\mu simultaneously in a good agreement with the experimental data can be achieved in SO(10) model with \mu<0. In the region of the parameter space preferred by our analysis there are two main mechanisms leading to the LSP relic abundance consistent with the WMAP results. One is the co-annihilation with the stau and the second is the resonant annihilation via exchange of the Z boson or the light Higgs scalar. A very interesting feature of SO(10) models with negative \mu is that they predict relatively light sparticle spectra. Even the heaviest superpartners may easily have masses below 1.5 TeV in contrast to multi-TeV particles typical for models with positive \mu.