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Deeply virtual compton scattering off the neutron |
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| Authors: | 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 |
| Institution: | LPSC, Université Joseph Fourier, CNRS/IN2P3, INPG, F-38026 Grenoble, France. |
| 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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