Search for new physics in $B_s \rightarrow \mu^+ \mu^-$ and $B \rightarrow K^{(*)} \mu^+ \mu^-$

TL;DR

This paper investigates rare B meson decays involving muons to search for signs of new physics beyond the Standard Model, focusing on angular asymmetries and branching fractions.

Contribution

It presents recent measurements of observables in $b o s l^+ l^-$ decays, including angular asymmetries and branching fractions, providing data to test new physics models.

Findings

Measurements of angular asymmetries in $B_d o K^* ta^+ ta^-$

Branching fraction measurements of $B_{s,d} o ta^+ ta^-$

Isospin asymmetry in $B o K^{(*)} ta^+ ta^-$ decays

Abstract

Transitions of the type $b \to s l^+ l^-$ are flavour changing neutral current processes where new physics can enter in competing loop diagrams with respect to the Standard Model contributions. In these decays several observables sensitive to new physics, and where theoretical uncertainties are under control, can be constructed. Particularly interesting are the angular asymmetries in the decay $B_d \to K^* \mu^+ \mu^-$ and the measurement of the branching fraction of the decays $B_{s,d} \to \mu^+ \mu^-$. Recent measurements of these observables and the measurement of the isospin asymmetry in the decays $B \to K^{(*)} \mu^+ \mu^-$ are presented.