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

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

1998-05-19

arxiv.org/abs/hep-ph/9805380v1

Phys.Rev.Lett. 81 (1998) 1782-1785

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, 1 figure, LaTeX2e

Scientific paper

10.1103/PhysRevLett.81.1782

Hadron pair production gamma* gamma -> h hbar in the region where the c.m. energy is much smaller than the photon virtuality can be described in a factorized form, as the convolution of a partonic handbag diagram and generalized distribution amplitudes which are new non-perturbative functions describing the exclusive fragmentation of a quark-antiquark pair into two hadrons. Scaling behavior and a selection rule on photon helicity are signatures of this mechanism. The case where h is a pion is emphasized.

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