Abstract
We present standard model (SM) estimates for exclusive c → uγ processes in heavy quark and hybrid frameworks. Measured branching ratios mathrm{mathcal{B}}left({D}^0to left(phi, {overline{K}}^{ast 0}right)gamma right) are at or somewhat exceeding the upper range of the SM and suggest slow convergence of the 1/mD, αs-expansion. Model-independent constraints on |ΔC| = | ΔU | = 1 dipole operators from ℬ(D0 → ρ0γ) data are obtained. Predictions and implications for leptoquark models are worked out. While branching ratios are SM-like CP asymmetries ≲ 10% can be induced. In SUSY deviations from the SM can be even larger with CP asymmetries of O(0.1). If Λc-baryons are produced polarized, such as at the Z-pole, an angular asymmetry in Λc → pγ decays can be studied that is sensitive to chirality-flipped contributions.
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