Opportunities with (semi)leptonic rare charm decays

TL;DR

This paper explores the potential of (semi)leptonic rare charm decays as probes for new physics beyond the Standard Model, analyzing various observables and model scenarios.

Contribution

It provides a comprehensive, model-independent analysis of BSM effects in charm decays, including angular observables and LFV decays, with implications for flavor physics.

Findings

Potential BSM signals in charm decay observables

Constraints on Leptoquark models from charm decay data

Predictions for LFV decay rates in various models

Abstract

We study (semi)leptonic rare charm decays and its opportunities in searches for physics beyond the Standard Model (BSM). In particular, we analyse the impact of potential BSM physics in $c\to ull'$ transitions, notably branching ratios, angular observables, asymmetries and Lepton Flavour Violating (LFV) decays. Testable effects are worked out model-independently and within Leptoquark models supplemented with flavour patterns to link $K$/$B$ decays.