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Physical Review Letters 81 (1998) 1782-1785
Probing partonic structure in $\gamma* \gamma \longrightarrow \pi \pi$ near threshold.
M. Diehl, T. Gousset1, B. Pire, O. Teryaev
(1998)

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.
1 :  SUBATECH - Laboratoire SUBATECH Nantes
Physique/Physique des Hautes Energies - Phénoménologie
Lien vers le texte intégral : 
http://fr.arXiv.org/abs/hep-ph/9805380