Two-pion light-cone distribution amplitudes from the instanton vacuum

Abstract

We calculate the two-pion light-cone distribution amplitudes in the effective low-energy theory based on the instanton vacuum. These generalized distribution amplitudes describe the soft (non-perturbative) part of the process ${\gamma }^{\ast }\gamma \to \pi \pi$ in the region where the c.m. energy is much smaller than the photon virtuality. They can also be used in the analysis of exclusive processes such as ${\gamma }^{\ast }p\to p+2\pi ,3\pi$ etc.

13 pages, LaTeX, 4 figures included using epsf

References in corpus (1)

• Probing partonic structure in gamma* gamma -> pi pi near threshold

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