Rare radiative charm decays in the standard model and beyond

TL;DR

This paper discusses recent measurements and improved predictions of rare radiative charm decays within the Standard Model, exploring their potential to reveal new physics beyond the SM, such as leptoquarks and supersymmetry.

Contribution

It provides updated SM predictions for branching ratios and CP asymmetries, and highlights the significance of weak annihilation decays and future polarization measurements in probing new physics.

Findings

Improved SM predictions for $D^0\to\rho^0\gamma$ branching ratios and CP asymmetries.

Weak annihilation decays as probes of non-perturbative QCD.

Potential of $\Lambda_c\to p\gamma$ for future polarization studies.

Abstract

Motivated by the recent measurement of $D^0\to\rho^0\gamma$ improved standard model (SM) predictions for branching ratios and CP asymmetries of radiative charm decay are given. Weak annihilation induced decays are probes of non-perturbative QCD approaches. Rare decays probe the SM and physics beyond the SM, e.g. leptoquark and supersymmetric models. Opportunities with $\Lambda_c\to p\gamma$ for future polarization measurements are presented.