Abstract
We consider here the leptonic decay of vector mesons ρ, ω, ϕ, ψ and ϒ through one photon mechanism in the lowest order, and calculate their decay widths as well as the decay constants based on a field-theoretic quark model where the constituent quark field operators are described with an ansatz to satisfy equal time algebra and the translationally invariant hadron states are described with harmonic oscillator wave functions. With the harmonic oscillator radii for vector mesons and the constituent quark masses as used earlier in other investigations, the present calculations show a reasonable agreement with the experimental data in light as well as heavy flavor sectors, where available.
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