Dispersion representations for hard exclusive reactions

Details Dispersion representations for hard exclusive reactions Dispersion representations for hard exclusive reactions

2007-12-20

arxiv.org/abs/0712.3533v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, Talk presented at the 12th Workshop on High Energy Spin Physics (DSPIN-07), Dubna, Russia, September 3--7, 2007

Scientific paper

A number of hard exclusive scattering processes can be described in terms of generalized parton distributions (GPDs) and perturbative hard-scattering kernels. Both the physical amplitude and the hard-scattering kernels fulfill dispersion relations. We show that their consistency at all orders in perturbation theory is guaranteed if the GPDs satisfy certain integral relations. These relations are fulfilled thanks to Lorentz invariance.

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