Relative importance of various Dirac structures in hadron-quark vertex for studies on leptonic decays of vector mesons

Studied here is electromagnetic decays of ground state equal mass vector mesons: ρ, ω, φ, ψ and Y (each comprising of equal mass quarks) through the process, V → γ * → e- + e+ which proceeds through the coupling of quark-anti quark loop to the electromagnetic current in the framework of Bethe-Salpeter Equation (BSE), which is a conventional nonperturbative approach in dealing with relativistic bound state problems in QCD and is firmly established in the framework of Field Theory. From the solutions, we obtain useful information about the inner structure of hadrons which is also crucial in high energy hadronic scattering and production processes