MSSM with Large tan$\beta$ Constrained by Minimal SO(10) Unification

Study of the MSSM in large tan$\beta$ regime has to include correlations between the constraints presented by the low energy values of the b quark mass and $BR(b\to s\gamma)$. Both quantities receive SUSY contributions enhanced by tan$\beta$ and have a major impact on the MSSM analysis. Here we summarize the results of such a study constrained by minimal SO(10) unification. We show the best fits, in the $(m_0,M_{1/2})$ plane, obtained in the global analysis spanned over the gauge, Yukawa and SUSY parameter space at the unification scale. Two distinct fits describe the available low-energy data very well. The fits differ by the overall sign of the $b\to s\gamma$ decay amplitude. We conclude that an attractive SO(10)-derived regime of the MSSM remains a viable option.