E00-110 experiment at Jefferson Lab Hall A: Deeply virtual Compton scattering off the proton at 6 GeV
Author(s)
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.; 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. E.; 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, Bryan J.; Munoz Camacho, C.; Nanda, S.; Nelyubin, V.; Paremuzyan, R.; Potokar, M.; 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.; Gayou, Olivier; Monaghan, Peter; Qiang, Yi; ... Show more Show less
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We present final results on the photon electroproduction ([→ over e]p → epγ) 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[superscript 2] and x[subscript B] dependencies of both the helicity-dependent and the helicity-independent cross sections are discussed. The Q[superscript 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[superscript 2] term to the photon electroproduction cross section. The necessity to include higher-twist corrections to fully reproduce the shape of the data is also discussed. The DVCS cross sections in this paper represent the final set of experimental results from E00-110, superseding the previous publication.
Date issued
2015-11Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear ScienceJournal
Physical Review C
Publisher
American Physical Society
Citation
Defurne, M., et al. "E00-110 experiment at Jefferson Lab Hall A: Deeply virtual Compton scattering off the proton at 6 GeV." Phys. Rev. C 92, 055202 (November 2015). © 2015 American Physical Society
Version: Final published version
ISSN
0556-2813
1089-490X