Rare radiative charm decays in the standard model and beyond

摘要

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