Phys. Rev. C 79, 015201 (2009) [18 pages]
Virtual Compton scattering and neutral pion electroproduction in the resonance region up to the deep inelastic region at backward angles
Abstract
References (55)
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G. Laveissière, 1 N. Degrande, 2 S. Jaminion, 1 C. Jutier, 1,3 L. Todor, 3 R. Di Salvo, 1 L. Van Hoorebeke, 2 L. C. Alexa, 4 B. D. Anderson, 5 K. A. Aniol, 6 K. Arundell, 7 G. Audit, 8 L. Auerbach, 9 F. T. Baker, 10 M. Baylac, 8 J. Berthot, 1 P. Y. Bertin, 1 W. Bertozzi, 11 L. Bimbot, 12 W. U. Boeglin, 13 E. J. Brash, 4 V. Breton, 1 H. Breuer, 14 E. Burtin, 8 J. R. Calarco, 15 L. S. Cardman, 16 C. Cavata, 8 C.-C. Chang, 14 J.-P. Chen, 16 E. Chudakov, 16 E. Cisbani, 17 D. S. Dale, 18 C. W. de Jager, 16 R. De Leo, 19 A. Deur, 1,16 N. d'Hose, 8 G. E. Dodge, 3 J. J. Domingo, 16 L. Elouadrhiri, 16 M. B. Epstein, 6 L. A. Ewell, 14 J. M. Finn, 7 K. G. Fissum, 11 H. Fonvieille, 1 G. Fournier, 8 B. Frois, 8 S. Frullani, 17 C. Furget, 20 H. Gao, 11 J. Gao, 11 F. Garibaldi, 17 A. Gasparian, 18,21 S. Gilad, 11 R. Gilman, 16,22 A. Glamazdin, 23 C. Glashausser, 22 J. Gomez, 16 V. Gorbenko, 23 P. Grenier, 1 P. A. M. Guichon, 8 J. O. Hansen, 16 R. Holmes, 24 M. Holtrop, 15 C. Howell, 25 G. M. Huber, 4 C. E. Hyde, 1,3 S. Incerti, 9 M. Iodice, 17 J. Jardillier, 8 M. K. Jones, 7 W. Kahl, 24 S. Kamalov, 26 S. Kato, 27 A. T. Katramatou, 5 J. J. Kelly, 14 S. Kerhoas, 8 A. Ketikyan, 28 M. Khayat, 5 K. Kino, 29 S. Kox, 20 L. H. Kramer, 13 K. S. Kumar, 30 G. Kumbartzki, 22 M. Kuss, 16 A. Leone, 31 J. J. LeRose, 16 M. Liang, 16 R. A. Lindgren, 32 N. Liyanage, 11 G. J. Lolos, 4 R. W. Lourie, 33 R. Madey, 5 K. Maeda, 29 S. Malov, 22 D. M. Manley, 5 C. Marchand, 8 D. Marchand, 8 D. J. Margaziotis, 6 P. Markowitz, 13 J. Marroncle, 8 J. Martino, 8 K. McCormick, 3 J. McIntyre, 22 S. Mehrabyan, 28 F. Merchez, 20 Z. E. Meziani, 9 R. Michaels, 16 G. W. Miller, 30 J. Y. Mougey, 20 S. K. Nanda, 16 D. Neyret, 8 E. A. J. M. Offermann, 16 Z. Papandreou, 4 C. F. Perdrisat, 7 R. Perrino, 31 G. G. Petratos, 5 S. Platchkov, 8 R. Pomatsalyuk, 23 D. L. Prout, 5 V. A. Punjabi, 34 T. Pussieux, 8 G. Quémenér, 1,7 R. D. Ransome, 22 O. Ravel, 1 J. S. Real, 20 F. Renard, 8 Y. Roblin, 1 D. Rowntree, 11 G. Rutledge, 7 P. M. Rutt, 22 A. Saha, 16 T. Saito, 29 A. J. Sarty, 35 A. Serdarevic, 4,16 T. Smith, 15 G. Smirnov, 1 K. Soldi, 36 P. Sorokin, 23 P. A. Souder, 24 R. Suleiman, 11 J. A. Templon, 10 T. Terasawa, 29 L. Tiator, 26 R. Tieulent, 20 E. Tomasi-Gustaffson, 8 H. Tsubota, 29 H. Ueno, 27 P. E. Ulmer, 3 G. M. Urciuoli, 17 R. Van De Vyver, 2 R. L. J. Van der Meer, 4,16 P. Vernin, 8 B. Vlahovic, 16,36 H. Voskanyan, 28 E. Voutier, 20 J. W. Watson, 5 L. B. Weinstein, 3 K. Wijesooriya, 7 R. Wilson, 37 B. B. Wojtsekhowski, 16 D. G. Zainea, 4 W.-M. Zhang, 5 J. Zhao, 11 and Z.-L. Zhou11
(Jefferson Lab Hall A Collaboration)
1LPC-Clermont, Université Blaise Pascal, CNRS/IN2P3, F-63177 Aubière Cedex, France
2University of Gent, B-9000 Gent, Belgium
3Old Dominion University, Norfolk, Virginia 23529, USA
4University of Regina, Regina, Saskatchewan, S4S OA2 Canada
5Kent State University, Kent, Ohio 44242, USA
6California State University, Los Angeles, Los Angeles, California 90032, USA
7College of William and Mary, Williamsburg, Virginia 23187, USA
8CEA Saclay, F-91191 Gif-sur-Yvette, France
9Temple University, Philadelphia, Pennsylvania 19122, USA
10University of Georgia, Athens, Georgia 30602, USA
11Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
12IPNO, Université Paris XI, CNRS/IN2P3, F-91406 Orsay, France
13Florida International University, Miami, Florida 33199, USA
14University of Maryland, College Park, Maryland 20742, USA
15University of New Hampshire, Durham, New Hampshire 03824, USA
16Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
17INFN, Sezione Sanità and Istituto Superiore di Sanità, I-00161 Rome, Italy
18University of Kentucky, Lexington, Kentucky 40506, USA
19INFN, Sezione di Bari and University of Bari, I-70126 Bari, Italy
20LPSC Grenoble, Université Joseph Fourier, CNRS/IN2P3, INP, F-38026 Grenoble, France
21Hampton University, Hampton, Virginia 23668, USA
22Rutgers, The State University of New Jersey, Piscataway, New Jersey 08855, USA
23Kharkov Institute of Physics and Technology, Kharkov 61108, Ukraine
24Syracuse University, Syracuse, New York 13244, USA
25Duke University, Durham, North Carolina 27706, USA
26Institut fuer Kernphysik, University of Mainz, D-55099 Mainz, Germany
27Yamagata University, Yamagata 990, Japan
28Yerevan Physics Institute, Yerevan 375036, Armenia
29Tohoku University, Sendai 980, Japan
30Princeton University, Princeton, New Jersey 08544, USA
31INFN, Sezione di Lecce, I-73100 Lecce, Italy
32University of Virginia, Charlottesville, Virginia 22901, USA
33State University of New York at Stony Brook, Stony Brook, New York 11794, USA
34Norfolk State University, Norfolk, Virginia 23504, USA
35Florida State University, Tallahassee, Florida 32306, USA
36North Carolina Central University, Durham, North Carolina 27707, USA
37Harvard University, Cambridge, Massachusetts 02138, USA
Received 16 October 2008; published 6 January 2009
We have made the first measurements of the virtual Compton scattering (VCS) process via the H(e, e'p) exclusive reaction in the nucleon resonance region, at backward angles. Results are presented for the W-dependence at fixed Q2=1 GeV2 and for the Q2 dependence at fixed W near 1.5 GeV. The VCS data show resonant structures in the first and second resonance regions. The observed Q2 dependence is smooth. The measured ratio of H(e, e'p) to H(e, e'p) 0 cross sections emphasizes the different sensitivity of these two reactions to the various nucleon resonances. Finally, when compared to real Compton scattering (RCS) at high energy and large angles, our VCS data at the highest W (1.8-1.9 GeV) show a striking Q2 independence, which may suggest a transition to a perturbative scattering mechanism at the quark level.
©2009 The American Physical Society
| URL: |
http://link.aps.org/doi/10.1103/PhysRevC.79.015201
|
| DOI: |
10.1103/PhysRevC.79.015201 |
| PACS: |
13.60.Fz;
14.20.Gk;
25.30.Rw
|
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