Top mass dependent alpha_s^3 corrections to B-meson mixing in the MSSM

TL;DR

This paper calculates top mass dependent NLO corrections to B-meson mixing in the MSSM, revealing their potential significance in certain parameter space regions despite generally small size.

Contribution

It provides the first computation of top mass dependent NLO matching conditions for the Delta F=2 Hamiltonian in the MSSM, extending previous zero-mass approximations.

Findings

Corrections are generally small but can be significant in specific scenarios.

In some cases, contributions to Wilson coefficients C1 and C4 can overcome suppression factors.

The results help refine predictions for B-meson mixing in supersymmetric models.

Abstract

We compute the top mass dependent NLO strong interaction matching conditions to the Delta F=2 effective Hamiltonian in the general MSSM. We study the relevance of such corrections, comparing its size with that of previously known NLO corrections in the limit mt->0, in scenarios with degeneracy, alignment, and hierarchical squarks. We find that, while these corrections are generally small, there are regions in the parameter space where the contributions to the Wilson coefficients C1 and C4 could partially overcome the expected suppression m_t/M_SUSY.