On the physical Relevance of the Study of gamma* gamma -> pi0 pi0 at small t and large Q2

Details On the physical Relevance of the Study of gamma* gamma -> pi0 pi0 at small t and large Q2 On the physical Relevance of the Study of gamma* gamma -> pi0 pi0 at small t and large Q2

2009-07-20

arxiv.org/abs/0907.3455v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

Invited talk at Photon 2009: International Conference On The Structure And Interactions Of The Photon: 18th International Work

Scientific paper

We discuss the relevance of a dedicated measurement of exclusive production of a pair of neutral pions in a hard gamma* gamma scattering at small momentum transfer. In this case, the virtuality of one photon provides us with a hard scale in the process, enabling us to perform a QCD calculation of this reaction rate using the concept of Transition Distribution Amplitudes (TDA). Those are related by sum rules to the pion axial form factor F^pi_A and, as a direct consequence, a cross-section measurement of this process at intense beam electron-positron colliders such as CLEO, KEK-B and PEP-II, or Super-B would provide us with a unique measurement of the neutral pion axial form factor F^pi0_A at small scale.

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