E00-110 experiment at Jefferson Lab Hall A: Deeply virtual Compton scattering off the proton at 6 GeV

Journal Article · Tue Nov 03 00:00:00 EST 2015 · Physical Review C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.92.055202· OSTI ID:1224880

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

We present final results on the photon electroproduction ($$\vec{e}p\rightarrow ep\gamma$$) cross section in the deeply virtual Compton scattering (DVCS) regime and the valence quark region from Jefferson Lab experiment E00-110. Results from an analysis of a subset of these data were published before, but the analysis has been improved which is described here at length, together with details on the experimental setup. Furthermore, additional data have been analyzed resulting in photon electroproduction cross sections at new kinematic settings, for a total of 588 experimental bins. Results of the $Q^2$- and $$x_B$$-dependences of both the helicity-dependent and helicity-independent cross sections are discussed. The $Q^2$-dependence illustrates the dominance of the twist-2 handbag amplitude in the kinematics of the experiment, as previously noted. Thanks to the excellent accuracy of this high luminosity experiment, it becomes clear that the unpolarized cross section shows a significant deviation from the Bethe-Heitler process in our kinematics, compatible with a large contribution from the leading twist-2 DVCS$^2$ term to the photon electroproduction cross section. The necessity to include higher-twist corrections in order to fully reproduce the shape of the data is also discussed. The DVCS cross sections in this study represent the final set of experimental results from E00-110, superseding the previous publication.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• Contributing Organization: Jefferson Lab Hall A Collaboration
• Grant/Contract Number: AC05-06OR23177; DOE-AC05-06OR23177
• OSTI ID: 1224880
• Alternate ID(s): OSTI ID: 1225121
• Report Number(s): JLAB-PHY-15-2038; DOE/OR/23177-3339; arXiv:1504.05453; PRVCAN
• Journal Information: Physical Review C, Nuclear Physics, Vol. 92, Issue 5; ISSN 0556-2813
• Publisher: American Physical Society (APS)
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS