The perturbative limit of the two-pion distribution amplitude

Details The perturbative limit of the two-pion distribution amplitude The perturbative limit of the two-pion distribution amplitude

1999-12-15

arxiv.org/abs/hep-ph/9912364v1

Phys.Rev. D61 (2000) 074029

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, 4 figures

Scientific paper

10.1103/PhysRevD.61.074029

We consider pion pair production in two-photon collisions, gamma* gamma -> pi+ pi-, at large photon virtuality Q^2 and center-of-mass energy \sqrt{s} in the hard-scattering picture. In the limit where s is large but s << Q^2 we derive an expression for the two-pion light-cone distribution in terms of the conventional pion distribution amplitudes. Our result reproduces the well-known scaling behavior, helicity selection rule and symmetry relations in this regime.

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