b\to s\nu\bar{\nu} decay in the MSSM: Implication of b\to s\gamma at large tan beta

TL;DR

This paper examines the impact of large tan beta in the MSSM on the rare decay b→sνν̄, highlighting how constraints from b→sγ limit potential new physics contributions, especially from gluino loops.

Contribution

It provides a detailed analysis of supersymmetric contributions to b→sνν̄ at large tan beta, emphasizing the constraining role of b→sγ decay measurements.

Findings

Gluino and charged Higgs contributions can be sizable at large tan beta.

Experimental bounds on b→sγ strongly restrict new physics effects in b→sνν̄.

Constraints from B_s→μ^+μ^- decay are briefly discussed.

Abstract

The decay $b\to s\nu\bar{\nu}$ is discussed in the minimal supersymmetric standard model with general flavor mixing for squarks, at large $\tan\beta$. In this case, in addition to the chargino loop contributions which were analyzed in previously studies, $\tan\beta$-enhanced contributions from the gluino and charged Higgs boson loops might become sizable compared with the standard model contribution, at least in principle. However, it is demonstrated that the experimental bounds on the new physics contributions to the radiative decay $b\to s\gamma$ should strongly constrain these contributions to $b\to s\nu\bar{\nu}$, especially on the gluino contribution. We also briefly comment on a possible constraint from the $B_s\to\mu^+\mu^-$ decay.