Rare decays of b and c hadrons

TL;DR

This white paper reviews the current status, experimental prospects, and theoretical challenges in studying rare decays of b and c hadrons, emphasizing their importance in searching for new physics beyond the Standard Model.

Contribution

It provides a comprehensive overview of the field, highlighting promising experimental opportunities and outlining key theoretical challenges to improve decay predictions.

Findings

Experimental opportunities at major colliders are expanding.

Theoretical uncertainties need to be reduced to match experimental sensitivities.

Rare decays remain a vital probe for new physics beyond the Standard Model.

Abstract

In this white paper for the Snowmass process, we review the status and prospects of the field of rare decays of b and c hadrons. The role that rare decays play in the search for physics beyond the Standard Model is emphasised. We stress the complementarity of a large set of relevant processes and outline the most promising directions. The experimental opportunities at Belle II, BES III, ATLAS, CMS, LHCb, and at future machines are discussed. We also summarize the challenges that need to be addressed on the theory side to achieve theory uncertainties for rare decays that match the expected experimental sensitivities.