Journal
EUROPEAN PHYSICAL JOURNAL A
Volume 39, Issue 1, Pages 5-31Publisher
SPRINGER
DOI: 10.1140/epja/i2008-10683-5
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Funding
- Italian Istituto Nazionale di Fisica Nucleare
- French Centre National de la Recherche Scientifique and Commissariat a l'Energie Atomique
- UK Engineering and Physical Science Research Council
- U. S. Department of Energy [DE-AC05-84ER40150]
- National Science Foundation
- Korea Research Foundation
- STFC [ST/F500572/1, ST/G008582/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/F500572/1, ST/G008582/1] Funding Source: researchfish
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The ep -> e'pp(0) reaction has been measured using the 5.754 GeV electron beam of Jefferson Lab and the CLAS detector. This represents the largest ever set of data for this reaction in the valence region. Integrated and differential cross-sections are presented. The W, Q(2) and t dependences of the cross-section are compared to theoretical calculations based on the t-channel meson-exchange Regge theory, on the one hand, and on quark handbag diagrams related to Generalized Parton Distributions (GPDs) on the other hand. The Regge approach can describe at the approximate to 30% level most of the features of the present data while the two GPD calculations that are presented in this article which succesfully reproduce the high-energy data strongly underestimate the present data. The question is then raised whether this discrepancy originates from an incomplete or inexact way of modelling the GPDs or the associated hard scattering amplitude or whether the GPD formalism is simply inapplicable in this region due to higher-twists contributions, incalculable at present.
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