Study of π⁰ and η decays containing dilepton

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We calculate the momentum dependent form factors of P → γ* γ*(P=π⁰, η) within the light-front quark model. Using the form factors, we examine the decays of P → l+ l-, P → l+ l- γ and P → l+ l- l+ l-(l=e or μ) and compare our results with the experimental data and other theoretical predictions. In particular, for π⁰ → e+e-, we find that the decay branching ratio is 6.68× 10⁻⁸, which is consistent with the recent measurement of (7.48±0.29±0.25)× 10⁻⁸ by E799 of KTeV/Fermilab.