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Phys Rev Lett. 2007 Dec 14;99(24):242501. doi: 10.1103/PhysRevLett.99.242501. Epub 2007 Dec 10.

Deeply virtual compton scattering off the neutron.

Physical review letters

M Mazouz, A Camsonne, C Muñoz Camacho, 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, H Ibrahim, R Igarashi, X Jiang, H S Jo, L J Kaufman, A Kelleher, A Kolarkar, G Kumbartzki, G Laveissiere, 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,

Affiliations

  1. LPSC, Université Joseph Fourier, CNRS/IN2P3, INPG, F-38026 Grenoble, France.

PMID: 18233443 DOI: 10.1103/PhysRevLett.99.242501

Abstract

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.

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