Journal
EUROPEAN PHYSICAL JOURNAL C
Volume 58, Issue 2, Pages 193-215Publisher
SPRINGER
DOI: 10.1140/epjc/s10052-008-0741-0
Keywords
11; 30; Cp; 13; 60; Fz; 11; 30; Ly; 11; 55; Hx
Categories
Funding
- BMBF (Federal Ministry for Education and Research)
- Croatian Ministry of Science, Education and Sport [1190982930-1016, 098-0982930-2864]
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To leading order approximation, the physical content of generalized parton distributions (GPDs) that is accessible in deep virtual electroproduction of photons or mesons is contained in their value on the cross-over trajectory. This trajectory separates the t-channel and s-channel dominated GPD regions. The underlying Lorentz covariance implies correspondence between these two regions through their relation to GPDs on the cross-over trajectory. This point of view leads to a family of GPD sum rules which are a quark analogue of finite energy sum rules and it guides us to a new phenomenological GPD concept. As an example, we discuss the constraints from the JLab/Hall A data on the dominant u-quark GPD H. The question arises whether GPDs are governed by some kind of holographic principle.
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