The B_s --> mu+mu- and B_d --> mu+mu- Decays: Standard Model and Beyond

TL;DR

This paper reviews the current understanding and recent measurements of the rare B_s and B_d decays to mu+mu-, discussing Standard Model predictions, additional observables, and implications for new physics, especially in supersymmetric models.

Contribution

It provides an updated review of Standard Model predictions, explores additional observables in B_s --> mu+mu-, and analyzes recent experimental results within new physics frameworks.

Findings

Latest Standard Model predictions for branching ratios

Recent measurement of B_s --> mu+mu- branching ratio

Implications for new physics models, including MSSM

Abstract

I review the status of the rare decays B_s --> mu+mu- and B_d --> mu+mu-. The latest Standard Model predictions for the corresponding branching ratios are discussed. An overview of additional observables that are accessible in the B_s --> mu+mu- decay is given. The new physics implications of the recent measurement of the B_s --> mu+mu- branching ratio are discussed both model independently and in the context of the Minimal Supersymmetric Standard Model.