Deeply virtual compton scattering off the neutron

The present experiment exploits the interference between the deeply virtual Compton scattering (DVCS) and the Bethe-Heitler processes to extract the imaginary part of DVCS amplitudes on the neutron and on the deuteron from the helicity-dependent D(e,e'gamma)X cross section measured at Q2=1.9 Ge...

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Veröffentlicht in:	Physical review letters 2007-12, Vol.99 (24), p.242501-242501, Article 242501
Hauptverfasser:	Mazouz, M, Camsonne, A, Camacho, C Muñoz, 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, C E, Ibrahim, H, Igarashi, R, Jiang, X, Jo, H S, Kaufman, L J, Kelleher, A, Kolarkar, A, Kumbartzki, G, Laveissiere, 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, 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
Format:	Artikel
Sprache:	eng
Schlagworte:	COMPTON EFFECT CROSS SECTIONS D QUARKS DEUTERONS HELICITY NEUTRONS Nuclear Experiment Physics PHYSICS OF ELEMENTARY PARTICLES AND FIELDS SPIN U QUARKS
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Beschreibung
Zusammenfassung:	The present experiment exploits the interference between the deeply virtual Compton scattering (DVCS) and the Bethe-Heitler processes to extract the imaginary part of DVCS amplitudes on the neutron and on the deuteron from the helicity-dependent D(e,e'gamma)X cross section measured at Q2=1.9 GeV2 and xB=0.36. We extract a linear combination of generalized parton distributions (GPDs) particularly sensitive to E_{q}, the least constrained GPD. A model dependent constraint on the contribution of the up and down quarks to the nucleon spin is deduced.
ISSN:	0031-9007 1079-7114
DOI:	10.1103/physrevlett.99.242501