Charm radiative decays with neutral mesons D0→(K)over-bar0γ, D0→(K)over-bar0η(η′)γ

The radiative decays D-0 --> (K) over bar (0)P(0)gamma with nouresonant (K) over bar P-0(0) (P-0 = pi(0), eta, eta') are considered within the framework which combines heavy quark effective theory and the chiral Lagrangian. Due to neutral mesons the amplitudes do not have bremsstrahlung contributions. We assume factorization for the weak matrix elements. Light (virtual) vector mesons are found to give the main contribution to the decay amplitudes. The decay D-0 --> (K) over bar (0)pi(0)gamma is predicted to have a branching ratio of 3 x 10(-4), with comparable contributions from parity-conserving and parity-violating parts of the amplitude. The decays with 17(77) in the final state are expected with branching ratios of 1.1 X 10(-5) and 0.4 x 10(-7), respectively, and are mainly parity conserving. (C) 2002 Elsevier Science B.V. All rights reserved.