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Scaling tests of the cross section for deeply virtual Compton scattering |
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| Authors: | Camacho C Muñoz Camsonne A Mazouz M Ferdi C Gavalian G Kuchina E Amarian M Aniol K A Beaumel M Benaoum H Bertin P Brossard M Chen J-P Chudakov E Craver B Cusanno F de Jager C W Deur A Feuerbach R Fieschi J-M Frullani S Garçon M Garibaldi F Gayou O Gilman R Gomez J Gueye P Guichon P A M Guillon B Hansen O Hayes D Higinbotham D Holmstrom T Hyde-Wright C E Ibrahim H Igarashi R Jiang X Jo H S Kaufman L J Kelleher A Kolarkar A Kumbartzki G Laveissière G Lerose J J Lindgren R Liyanage N Lu H-J Margaziotis D J Meziani Z-E McCormick K Michaels R Michel B Moffit B Monaghan P Nanda S Nelyubin V |
| Institution: | CEA Saclay, DAPNIA/SPhN, F-91191 Gif-sur-Yvette, France. |
| Abstract: | We present the first measurements of the eover -->]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. |
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