WEAK RADIATIVE DECAYS OF PSEUDOSCALAR CHARMED MESONS

We consider here radiative weak decays of charmed mesons such as D-0 --> ($) over bar K*(0) gamma and D-s(+) --> rho(+)gamma in a quark model where in general a translationally invariant SU(6) hadronic state is described by constituent quark field operators satisfying equal time algebra and a harmonic oscillator wave function. The model had its earlier success during its application to a variety of hadronic phenomena, and here also, without any free parameters, it calculates the branching ratios as Br(D-0 --> ($) over bar K*(0) gamma = 1.023 x 10(-3) and Br(D-s(+) --> rho(+)gamma) = 2.438 x 10(-3). Such calculations are very close to the estimations of Asthana and Kamal, and thus is consistent with the QCD enhancement of the latter branching ratio with respect to the former.