b-tau Yukawa (Non-)Unification in the CMSSM

Understand

Supersymmetric Grand Unification usually provides unification of the bottom quark and the tau lepton Yukawa couplings at the GUT scale.

• In the CMSSM this can be realised only for a very particular choice of parameters.
• In this letter we study the GUT scale ratio y_tau/y_b for less peculiar parameters in the large tan beta regime and identify one parameter region preferred by current experimental data.
• In this region, which is well within the reach of the LHC, the ratio is very close to the recently proposed value of 3/2.