Quark-Hadron Duality and Intrinsic Transverse Momentum

It is demonstrated in several exclusive processes involving the pion that a local quark-hadron duality prescription is equivalent to using an effective $\bar q q$ (two-body) light-cone wave function $Ψ^{(LD)}(x,k_{\perp})$ for the pion. This wave function models soft dynamics of all higher $\bar qG \ldots G q$ Fock components of the standard light-cone approach. Contributions corresponding to higher Fock components in a hard regime appear in this approach as radiative corrections and are suppressed by powers of $α_s/π$.

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