Fits to measurements of rare heavy flavour decays

TL;DR

This paper reviews recent experimental measurements of rare heavy flavor decays involving b-quarks, discusses fits to new physics models using effective field theory, and interprets results within simplified TeV-scale theories.

Contribution

It provides a comprehensive overview of current measurements and fits of rare b-quark decays, and explores their implications for new physics models.

Findings

Current measurements constrain new physics contributions.

Fits suggest possible deviations from the Standard Model.

Interpretations point to TeV-scale new physics scenarios.

Abstract

This write-up is intended to form part of the proceedings for Lepton-Photon 2023. We review the decays $b\rightarrow c \ell \bar \nu_\ell$ (where $\ell \in \{e,\mu,\tau\}$) as well as $b\rightarrow s \mu^+ \mu^-$ and $b\rightarrow s e^+ e^-$, giving the current state-of-the-art in terms of measurements. We review fits to such data of new physics weak effective field theory operators, before closing with interpretations in terms of simplified TeV-scale field theories.