P. C. Dash

RADIATIVE LEPTONIC DECAY OF Ds AND D MESONS

The radiative leptonic decays Ds → μνμγ and D → μνμγ are investigated at the tree level within the relativistic independent quark model based on the confining potential in the scalar–vector harmonic form. The branching ratios for these decays in the vanishing lepton mass limit are obtained as ℬr(Ds → μνμγ) = 4.94×10-4 and ℬr(D → μνμγ) = 3.34×10-5, which includes the contributions of the internal bremsstrahlung and structure dependent diagrams at the level of the quark constituents. Finally, the photon energy spectra as predicted here is found to be symmetric about the peak value of the photon energy at

Magnetic Dipole Transitions of

E_\gamma = \frac{M_{D_{(s)}}}{4}

B_c

.

and

We study M1-transitions involving mesons:

B_c^*

B_c(1s)

mesons in the Relativistic Independent Quark Model

,

Semileptonic decays of the B{sub c} meson

B_c^*(1s)

Exclusive nonleptonic B{yields}VV decays

,

Radiative leptonic decay: B{sup -}{yields}{mu}{sup -}{nu}{sub {mu}}{gamma} in a relativistic independent quark model

B_c(2s)

Nonleptonic two-body B c -meson decays

,