WEAK RADIATIVE DECAYS OF PSEUDOSCALAR CHARMED MESONS

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