Phys. Rev. C 80, 015205 (2009) [34 pages]
Electroproduction of  mesons in the S11(1535) resonance region at high momentum transfer
Abstract
References (43)
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M. M. Dalton, 1 G. S. Adams, 2 A. Ahmidouch, 3 T. Angelescu, 4 J. Arrington, 5 R. Asaturyan, 6 O. K. Baker, 7,8 N. Benmouna, 9 C. Bertoncini, 10 W. U. Boeglin, 11 P. E. Bosted, 8 H. Breuer, 12 M. E. Christy, 7 S. H. Connell, 13 Y. Cui, 14 S. Danagoulian, 3 D. Day, 15 T. Dodario, 14 J. A. Dunne, 16 D. Dutta, 16 N. El Khayari, 14 R. Ent, 8 H. C. Fenker, 8 V. V. Frolov, 17 L. Gan, 18 D. Gaskell, 8 K. Hafidi, 5 W. Hinton, 7,8 R. J. Holt, 5 T. Horn, 12 G. M. Huber, 19 E. Hungerford, 14 X. Jiang, 20 M. K. Jones, 8 K. Joo, 21 N. Kalantarians, 14 J. J. Kelly, 12 C. E. Keppel, 7,8 V. Kubarovsky, 2,8 Y. Li, 7 Y. Liang, 22 S. Malace, 4 P. Markowitz, 11 P. McKee, 15 D. G. Meekins, 8 H. Mkrtchyan, 6 B. Moziak, 2 T. Navasardyan, 6 G. Niculescu, 15 I. Niculescu, 23 A. K. Opper, 22 T. Ostapenko, 24 P. E. Reimer, 5 J. Reinhold, 11 J. Roche, 8 S. E. Rock, 25 E. Schulte, 5 E. Segbefia, 7 C. Smith, 15 G. R. Smith, 8 P. Stoler, 2 V. Tadevosyan, 6 L. Tang, 7,8 V. Tvaskis, 26 M. Ungaro, 21 A. Uzzle, 7 S. Vidakovic, 19 A. Villano, 2 W. F. Vulcan, 8 M. Wang, 25 G. Warren, 8 F. R. Wesselmann, 15 B. Wojtsekhowski, 8 S. A. Wood, 8 C. Xu, 19 L. Yuan, 7 X. Zheng, 5 and H. Zhu151University of the Witwatersrand, Johannesburg, South Africa
2Rensselaer Polytechnic Institute, Troy, New York 12180, USA
3North Carolina A&T State University, Greensboro, North Carolina 27411, USA
4Bucharest University, Bucharest, Romania
5Argonne National Laboratory, Argonne, Illinois 60439, USA
6Yerevan Physics Institute, Yerevan, Armenia
7Hampton University, Hampton, Virginia 23668, USA
8Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
9The George Washington University, Washington, D. C. 20052, USA
10Vassar College, Poughkeepsie, New York 12604, USA
11Florida International University, University Park, Florida 33199, USA
12University of Maryland, College Park, Maryland 20742, USA
13University of Johannesburg, Johannesburg, South Africa
14University of Houston, Houston, Texas 77204, USA
15University of Virginia, Charlottesville, Virginia 22901, USA
16Mississippi State University, Mississippi State, Mississippi 39762, USA
17LIGO Livingston Observatory, Livingston, Louisiana 70754, USA
18University of North Carolina Wilmington, Wilmington, North Carolina 28403, USA
19University of Regina, Regina, Saskatchewan, Canada S4S 0A2
20Rutgers, The State University of New Jersey, Piscataway, New Jersey 08855, USA
21University of Connecticut, Storrs, Connecticut 06269, USA
22Ohio University, Athens, Ohio 45071, USA
23James Madison University, Harrisonburg, Virginia 22807, USA
24Gettysburg College, Gettysburg, Pennsylvania 18103, USA
25University of Massachusetts Amherst, Amherst, Massachusetts 01003, USA
26Nationaal Instituut voor Subatomaire Fysica, Amsterdam, The Netherlands
Received 26 February 2009; published 16 July 2009
The differential cross section for the process p(e,e'p) has been measured at Q2~5.7 and 7.0(GeV/c)2 for center-of-mass energies from threshold to 1.8 GeV, encompassing the S11(1535) resonance, which dominates the channel. This is the highest momentum-transfer measurement of this exclusive process to date. The helicity-conserving transition amplitude A1/2, for the production of the S11(1535) resonance, is extracted from the data. Within the limited Q2 now measured, this quantity appears to begin scaling as Q-3—a predicted, but not definitive, signal of the dominance of perturbative QCD at Q2~5 (GeV/c)2.
©2009 The American Physical Society
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