From Diphoton GDAs and Photon GPDs to the chiral odd Photon DA

Details From Diphoton GDAs and Photon GPDs to the chiral odd Photon DA From Diphoton GDAs and Photon GPDs to the chiral odd Photon DA

2009-07-02

arxiv.org/abs/0907.0352v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

6pages, 2 figures, to be published in the proceedings of the international conference onthe structure and the Interactions of

Scientific paper

The photon is a very interesting object for QCD studies since it has both a pointlike coupling to quarks, which yields a perturbative part of photon's wave function, and a non-perturbative coupling related to the magnetic susceptibility of the QCD vacuum and which builds its chiral-odd twist-2 distribution amplitude. The first feature allows us to compute the photon anomalous generalized parton distributions (GPD) and the diphoton generalized distribution amplitudes. The second feature allows us to use a transverse spin asymmetry to probe the chiral odd distribution amplitude of the photon.

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