Dispersion representations for hard exclusive processes

Details Dispersion representations for hard exclusive processes Dispersion representations for hard exclusive processes

2007-07-03

arxiv.org/abs/0707.0351v1

Eur.Phys.J.C52:919-932,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

24 pages

Scientific paper

10.1140/epjc/s10052-007-0401-9

Several hard exclusive scattering processes admit a description in terms of generalized parton distributions and perturbative hard-scattering kernels. Both the physical amplitude and the hard-scattering kernels fulfill dispersion relations. We give a detailed investigation of their consistency at all orders in perturbation theory. The results shed light on the information about generalized parton distributions that can be extracted from the real and imaginary parts of exclusive amplitudes. They also provide a practical consistency check for models of these distributions in which Lorentz invariance is not exactly satisfied.

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