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

Abstract

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.

8 pages, 1 figure, LaTeX2e

References in corpus (1)

• Time ordering in off-diagonal parton distributions

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