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The light-front approach is a relativistic quark model and offers manyinsights to the internal structures of the hadronic bound states. In thisstudy, we apply the covariant light-front approach to ground-state heavyquarkonium. The pesudoscalar and vector meson decay constants are discussed. Wepresent a detailed study of two-photon annihilation P \to \gamma \gamma andmagnetic dipole transition V \to P \gamma processes. The numerical predictionsof the light-front approach are consistent with the experimental data and thosein other approaches. The relations of the light-front approach with the othermethods are discussed in brief.Comment: 18 pages, 5 figures, typos corrected, references added. Accepted for  pubblication in J. Phys.

Covariant light-front approach for heavy quarkonium: decay constants,P→ γγ andV→Pγ