Taming Deeply Virtual Compton Scattering

Details Taming Deeply Virtual Compton Scattering Taming Deeply Virtual Compton Scattering

2008-03-09

arxiv.org/abs/0803.1271v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 3 figures, results corrected for factor 2 in amplitude

Scientific paper

We study recent Deeply Virtual Compton scattering (DVCS) data within a dual parameterization of the Generalized Parton Distributions (GPDs). This parameterization allows to quantify the maximum amount of information, that can be extracted from DVCS data, in a ``quintessence'' function. We present a ``zero step'' model for the latter solely based on the forward quark density, providing a parameter free prediction for the imaginary part of the DVCS amplitude. It is shown that the bulk effect of the $e p \to e p \gamma$ beam helicity asymmetry can be understood within such a model.

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