Decay constants and radiative decays of heavy mesons in light-front quark model

We investigate the magnetic dipole decays V→Pγ of various heavy-flavored mesons such as (D,D*,Ds,Ds*,ηc,J/ψ) and (B,B*,Bs,Bs*,ηb,Υ) using the light-front quark model constrained by the variational principle for the QCD-motivated effective Hamiltonian. The momentum dependent form factors FVP(q2) for V→Pγ* decays are obtained in the q+=0 frame and then analytically continued to the timelike region by changing q to iq in the form factors. The coupling constant gVPγ for real photon case is then obtained in the limit as q2→0, i.e. gVPγ=FVP(q2=0). The weak decay constants of heavy pseudoscalar and vector mesons are also calculated. Our numerical results for the decay constants and radiative decay widths for the heavy-flavored mesons are overall in good agreement with the available experimental data as well as other theoretical model calculations.