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We present the magnetic dipole($M1$) transitions $V\to P\gamma$ of variousheavy-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 modelconstrained by the variational principle for the QCD-motivated effectiveHamiltonian. 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 determinethe unmeasured mass of $\eta_b$. Our numerical results are overall in goodagreement with the available experimental data as well as other theoreticalmodel calculations.

Light-front quark model analysis of heavy meson radiative decays