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

## TL;DR

This paper calculates two-loop decoupling corrections to tau-lepton and b-quark masses in the MSSM, focusing on Yukawa and strong interaction effects, which are crucial for precise parameter determination in beyond Standard Model theories.

## Contribution

It provides the first calculation of NNLO Yukawa corrections to fermion masses in the MSSM, extending previous work on strong interaction corrections.

## Key findings

- Yukawa corrections significantly affect fermion mass relations at large tan beta.
- The combined strong and Yukawa corrections are essential for accurate mass predictions.
- Tau-lepton corrections serve as a good approximation to the full two-loop results.

## Abstract

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. As a consequence, for large values of tan beta parameter corresponding Yukawa couplings also become large and together with tan beta can significantly enhance radiative corrections. In the case of b-quark two-loop O(alpha_s^2) contribution to the relation between running bottom-quark mass in QCD and MSSM is known in literature. This paper is devoted to calculation of the NNLO corrections proportional to Yukawa couplings. For the tau-lepton obtained contribution can be considered as a good approximation to the full two-loop result. For the b-quark numerical analysis given in the paper shows that only the sum of strong and Yukawa corrections can play such a role.