Phys. Rev. Lett.
99,
242501
(2007)
[5 pages]
Deeply Virtual Compton Scattering off the Neutron
M. Mazouz et al. Jefferson Lab Hall A Collaboration
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M. Mazouz1, A. Camsonne2, C. Muñoz Camacho3, C. Ferdi2, G. Gavalian4, E. Kuchina5, M. Amarian4, K. A. Aniol6, M. Beaumel3, H. Benaoum7, P. Bertin2,8, M. Brossard2, J.-P. Chen8, E. Chudakov8, B. Craver9, F. Cusanno10, C. W. de Jager8, A. Deur8, R. Feuerbach8, J.-M. Fieschi2, S. Frullani10, M. Garçon3, F. Garibaldi10, O. Gayou11, R. Gilman5, J. Gomez8, P. Gueye12, P. A. M. Guichon3, B. Guillon1, O. Hansen8, D. Hayes4, D. Higinbotham8, T. Holmstrom13, C. E. Hyde2,4, H. Ibrahim4, R. Igarashi14, X. Jiang5, H. S. Jo15, L. J. Kaufman16, A. Kelleher13, A. Kolarkar17, G. Kumbartzki5, G. Laveissiere2, J. J. LeRose8, R. Lindgren9, N. Liyanage9, H.-J. Lu18, D. J. Margaziotis6, Z.-E. Meziani19, K. McCormick5, R. Michaels8, B. Michel2, B. Moffit13, P. Monaghan11, S. Nanda8, V. Nelyubin9, M. Potokar20, Y. Qiang11, R. D. Ransome5, J.-S. Réal1, B. Reitz8, Y. Roblin8, J. Roche8, F. Sabatié3, A. Saha8, S. Sirca20, K. Slifer9, P. Solvignon19, R. Subedi21, V. Sulkosky13, P. E. Ulmer4, E. Voutier1, K. Wang9, L. B. Weinstein4, B. Wojtsekhowski8, X. Zheng22, and L. Zhu23 (Jefferson Lab Hall A Collaboration)
1LPSC, Université Joseph Fourier, CNRS/IN2P3, INPG, F-38026 Grenoble, France
2LPC Clermont-Ferrand, Université Blaise Pascal, CNRS/IN2P3, F-63177 Aubière, France
3CEA Saclay, DAPNIA/SPhN, F-91191 Gif-sur-Yvette, France
4Old Dominion University, Norfolk, Virginia 23508, USA
5Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, USA
6California State University, Los Angeles, Los Angeles, California 90032, USA
7Syracuse University, Syracuse, New York 13244, USA
8Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
9University of Virginia, Charlottesville, Virginia 22904, USA
10INFN/Sezione Sanità, 00161 Roma, Italy
11Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
12Hampton University, Hampton, Virginia 23668, USA
13College of William and Mary, Williamsburg, Virginia 23187, USA
14University of Saskatchewan, Saskatchewan, SK, Canada, S7N 5C6
15IPN Orsay, Université Paris Sud, CNRS/IN2P3, F-91406 Orsay, France
16University of Massachusetts Amherst, Amherst, Massachusetts 01003, USA
17University of Kentucky, Lexington, Kentucky 40506, USA
18Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China
19Temple University, Philadelphia, Pennsylvania 19122, USA
20Institut Jozef Stefan, University of Ljubljana, Ljubljana, Slovenia
21Kent State University, Kent, Ohio 44242, USA
22Argonne National Laboratory, Argonne, Illinois, 60439, USA
23University of Illinois, Urbana, Illinois 61801, USA
Received 20 August 2007; published 10 December 2007
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(e⃗,e′γ)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 Eq, the least constrained GPD. A model dependent constraint on the contribution of the up and down quarks to the nucleon spin is deduced.
© 2007 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.242501
DOI:
10.1103/PhysRevLett.99.242501
PACS:
25.30.−c, 13.60.Fz, 13.85.Hd, 14.20.Dh
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