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

الأصل · EN

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 γ*γ→ ππ 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 γ* p → p + 2π, 3π etc.