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Abstract:
The contributions from the valence quark state and the higher Fock states of hadronic wavefunctions in the process π0→γγ are analyzed in this paper. An important result, the contribution to the amplitude of the process π0→γγ from the valence Fock state is one half of the total amplitude, is proved by using a gauge invariant identity of the divergence of the axial vector current. From this inference we obtain a constraint on the valence Fock state wavefunction, which is very useful for useful for phenomenological analysis in exclusive processes.
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