Quark-Hadron Duality and Intrinsic Transverse Momentum

Abstract

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 ${\Psi }^{(LD)}(x,k_{\perp })$ for the pion. This wave function models soft dynamics of all higher $\bar{q}G\dots Gq$ 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 ${\alpha }_s/\pi$.

Comments: 26 pages LaTex, uses epsf.tex to insert figures; with 5 figures in encapsulated postscript form