Light-front quark model analysis of heavy meson radiative decays

We present the magnetic dipole($M1$) transitions $V\to P\gamma$ of various heavy-flavored mesons such as $(D,D^*,D_s,D^{*}_s,\eta_c, J/\psi)$ and $(B,B^*,B_s,B^*_s,\eta_b,\Upsilon)$ using the light-front quark model constrained by the variational principle for the QCD-motivated effective Hamiltonian. The weak decay constants of heavy mesons and the decay widths for $V\to P\gamma$ are calculated. The radiative decay for $\Upsilon\to\eta_{b}\gamma$ process is found to be very helpful to determine the unmeasured mass of $\eta_b$. Our numerical results are overall in good agreement with the available experimental data as well as other theoretical model calculations.