Exclusive meson pair production in gamma* gamma scattering at small momentum transfer

Abstract

We study the exclusive production of pi pi and rho pi in hard gamma* gamma scattering in the forward kinematical region where the virtuality of one photon provides us with a hard scale in the process. The newly introduced concept of Transition Distribution Amplitudes (TDA) is used to perform a QCD calculation of these reactions thanks to two simple models for TDAs. Cross sections for rho pi and pi pi production are evaluated and compared to the possible background from the Bremsstrahlung process. This picture may be tested at intense electron-positron colliders such as CLEO and B factories. The cross section e gamma -> e' pi0 pi0 is finally shown to provide a possible determination of the pi0 axial form factor, FA, at small t, which seems not to be measurable elsewhere.

16 pages, 13 figures, LaTeX

References in corpus (2)

• Vector meson photoproduction and problem of gauge invariance
• Pion Generalized Distribution Amplitudes in the Nonlocal Chiral Quark Model

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• QCD Factorizations in Exclusive gamma* gamma* -> rho0_L rho0_L
• Electron-Positron Radiative Annihilation : Timelike Virtual Compton Scattering
• On the physical Relevance of the Study of gamma* gamma -> pi0 pi0 at small t and large Q2