On the two-loop decoupling corrections to tau-lepton and b-quark running masses in the MSSM

Understand

Masses of heavy Standard Model fermions (top-quark, bottom-quark, and tau-lepton) play an important role in the analysis of theories beyond the SM.

• They serve as low-energy input and reduce the parameter space of such theories.
• In this paper Minimal supersymmetric extension of the SM is considered and two-loop relations between known SM values of fermion masses and running parameters of the MSSM are studied within the effective theory approach.
• Both b-quark and tau-lepton have the same quantum numbers with respect to SU(2) groupand in the MSSM acquire their masses due to interactions with the same Higgs doublet.