Scaling tests of the cross section for deeply virtual Compton scattering

C Muñoz Camacho; A Camsonne; M Mazouz; C Ferdi; G Gavalian; E Kuchina; M Amarian; K A Aniol; M Beaumel; H Benaoum; P Bertin; M Brossard; J-P Chen; E Chudakov; B Craver; F Cusanno; C W de Jager; A Deur; R Feuerbach; J-M Fieschi; S Frullani; M Garçon; F Garibaldi; O Gayou; R Gilman; J Gomez; P Gueye; P A M Guichon; B Guillon; O Hansen; D Hayes; D Higinbotham; T Holmstrom; C E Hyde-Wright; H Ibrahim; R Igarashi; X Jiang; H S Jo; L J Kaufman; A Kelleher; A Kolarkar; G Kumbartzki; G Laveissière; J J Lerose; R Lindgren; N Liyanage; H-J Lu; D J Margaziotis; Z-E Meziani; K McCormick; R Michaels; B Michel; B Moffit; P Monaghan; S Nanda; V Nelyubin; M Potokar; Y Qiang; R D Ransome; J-S Réal; B Reitz; Y Roblin; J Roche; F Sabatié; A Saha; S Sirca; K Slifer; P Solvignon; R Subedi; V Sulkosky; P E Ulmer; E Voutier; K Wang; L B Weinstein; B Wojtsekhowski; X Zheng; L Zhu; Jefferson Lab Hall A Collaboration

doi:10.1103/PhysRevLett.97.262002

Scaling tests of the cross section for deeply virtual Compton scattering

Phys Rev Lett. 2006 Dec 31;97(26):262002. doi: 10.1103/PhysRevLett.97.262002. Epub 2006 Dec 29.

Authors

C Muñoz Camacho¹, A Camsonne, M Mazouz, C Ferdi, G Gavalian, E Kuchina, M Amarian, K A Aniol, M Beaumel, H Benaoum, P Bertin, M Brossard, J-P Chen, E Chudakov, B Craver, F Cusanno, C W de Jager, A Deur, R Feuerbach, J-M Fieschi, S Frullani, M Garçon, F Garibaldi, O Gayou, R Gilman, J Gomez, P Gueye, P A M Guichon, B Guillon, O Hansen, D Hayes, D Higinbotham, T Holmstrom, C E Hyde-Wright, H Ibrahim, R Igarashi, X Jiang, H S Jo, L J Kaufman, A Kelleher, A Kolarkar, G Kumbartzki, G Laveissière, J J Lerose, R Lindgren, N Liyanage, H-J Lu, D J Margaziotis, Z-E Meziani, K McCormick, R Michaels, B Michel, B Moffit, P Monaghan, S Nanda, V Nelyubin, M Potokar, Y Qiang, R D Ransome, J-S Réal, B Reitz, Y Roblin, J Roche, F Sabatié, A Saha, S Sirca, K Slifer, P Solvignon, R Subedi, V Sulkosky, P E Ulmer, E Voutier, K Wang, L B Weinstein, B Wojtsekhowski, X Zheng, L Zhu; Jefferson Lab Hall A Collaboration

Affiliation

¹ CEA Saclay, DAPNIA/SPhN, F-91191 Gif-sur-Yvette, France.

PMID: 17280421
DOI: 10.1103/PhysRevLett.97.262002

Abstract

We present the first measurements of the e[over -->]p-->epgamma cross section in the deeply virtual Compton scattering (DVCS) regime and the valence quark region. The Q(2) dependence (from 1.5 to 2.3 GeV(2)) of the helicity-dependent cross section indicates the twist-2 dominance of DVCS, proving that generalized parton distributions (GPDs) are accessible to experiment at moderate Q(2). The helicity-independent cross section is also measured at Q(2)=2.3 GeV(2). We present the first model-independent measurement of linear combinations of GPDs and GPD integrals up to the twist-3 approximation.