Phys. Rev. C
68,
035202
(2003)
[14 pages]
ep⃗epπ0 reaction studied in the Δ(1232) mass region using polarization asymmetries
A. Biselli et al. (CLAS Collaboration)
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A. Biselli1,*, G. S. Adams1, M. J. Amaryan37, E. Anciant24, M. Anghinolfi13, B. Asavapibhop28, G. Asryan37, G. Audit24, T. Auger24, H. Avakian12, S. Barrow10, M. Battaglieri13, K. Beard16, M. Bektasoglu21, W. Bertozzi19, N. Bianchi12, S. Boiarinov14, B. E. Bonner23, P. Bosted28, S. Bouchigny17, R. Bradford3, D. Branford8, W. K. Brooks17, S. Bueltmann35, V. D. Burkert17, J. R. Calarco30, D. S. Carman22, B. Carnahan4, C. Cetina11, L. Ciciani21, P. L. Cole34, A. Coleman6, J. Connelly11, D. Cords17, P. Corvisiero13, D. Crabb35, H. Crannell4, J. Cummings1, E. De Sanctis12, R. De Vita13, P. V. Degtyarenko17, R. A. Demirchyan37, H. Denizli31, L. C. Dennis10, K. V. Dharmawardane21, K. S. Dhuga11, C. Djalali33, G. E. Dodge21, J. Domingo17, D. Doughty5,17, P. Dragovitsch10, M. Dugger2, S. Dytman31, M. Eckhause6, Y. V. Efremenko14, H. Egiyan6, K. S. Egiyan37, L. Elouadrhiri5,17, A. Empl1, P. Eugenio10, L. Farhi24, R. Fatemi35, R. J. Feuerbach3, J. Ficenec36, K. Fissum19, T. A. Forest21, A. Freyberger17, V. Frolov1, H. Funsten6, S. J. Gaff7, M. Gai27, G. Gavalian37, V. B. Gavrilov14, S. Gilad19, G. P. Gilfoyle32, K. L. Giovanetti16, P. Girard33, E. Golovatch29, K. A. Griffioen6, M. Guidal15, M. Guillo33, L. Guo17, V. Gyurjyan17, D. Hanock6, J. Hardie5, D. Heddle5,17, F. W. Hersman30, K. Hicks22, R. S. Hicks28, M. Holtrop30, J. Hu1, C. E. Hyde-Wright21, M. M. Ito17, D. Jenkins36, K. Joo35, J. H. Kelley7, M. Khandaker20,17, K. Y. Kim31, K. Kim18, W. Kim18, A. Klein21, F. J. Klein17, A. V. Klimenko21, M. Klusman1, M. Kossov14, L. H. Kramer9,17, Y. Kuang6, J. Kuhn1, S. E. Kuhn21, J. Lachniet3, J. M. Laget24, D. Lawrence28, G. A. Leksin14, A. Longhi4, K. Loukachine36, R. W. Major32, J. J. Manak17, C. Marchand24, S. K. Matthews4, S. McAleer10, J. W. C. McNabb3, J. McCarthy35, B. A. Mecking17, M. D. Mestayer17, C. A. Meyer3, R. Minehart35, M. Mirazita12, R. Miskimen28, V. Mokeev29, V. Muccifora12, J. Mueller31, L. Y. Murphy11, G. S. Mutchler23, J. Napolitano1, S. O. Nelson7, G. Niculescu22, B. Niczyporuk17, R. A. Niyazov21, M. Nozar17, J. T. O’Brien4, G. V. O’Rielly11, M. S. Ohandjanyan37, M. Osipenko29, K. Park18, Y. Patois33, G. A. Peterson28, S. Philips11, N. Pivnyuk14, D. Pocanic35, O. Pogorelko14, E. Polli12, B. M. Preedom33, J. W. Price26, L. M. Qin21, B. A. Raue9,17, G. Riccardi10, G. Ricco13, M. Ripani13, B. G. Ritchie2, S. Rock28, F. Ronchetti12, P. Rossi12, D. Rowntree19, P. D. Rubin32, K. Sabourov7, C. W. Salgado20, V. Sapunenko13, M. Sargsyan37, R. A. Schumacher3, V. S. Serov14, Y. G. Sharabian37, J. Shaw28, S. M. Shuvalov14, S. Simionatto11, A. Skabelin19, E. S. Smith17, L. C. Smith35, T. Smith30, D. I. Sober4, L. Sorrell28, M. Spraker7, S. Stepanyan37,21, P. Stoler1, I. I. Strakovsky11, M. Taiuti13, S. Taylor23, D. Tedeschi33, U. Thoma17, R. Thompson31, L. Todor3, T. Y. Tung6, C. Tur33, M. Ungaro1, M. F. Vineyard25, A. Vlassov14, K. Wang35, L. B. Weinstein21, H. Weller7, R. Welsh6, D. P. Weygand17, S. Whisnant33, M. Witkowski1, E. Wolin17, A. Yegneswaran17, J. Yun21, B. Zhang19, J. Zhao19, and Z. Zhou19 (CLAS Collaboration)
1Rensselaer Polytechnic Institute, Troy, New York 12180, USA
2Arizona State University, Tempe, Arizona 85287, USA
3Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
4Catholic University of America, Washington D.C., 20064, USA
5Christopher Newport University, Newport News, Virginia 23606, USA
6College of William and Mary, Williamsburg, Virginia 23187, USA
7Duke University, Physics Building, TUNL, Durham, North Carolina 27706, USA
8Edinburgh University, Edinburgh EH9 3JZ, United Kingdom
9Florida International University, Miami, Florida 33199, USA
10Florida State University, Tallahassee, Florida 32306, USA
11George Washington University, Washington D.C., 20052, USA
12Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati, P.O. Box 13, 00044 Frascati, Italy
13Istituto Nazionale di Fisica Nucleare, Sezione di Genova e Dipartimento di Fisica dell’Universita, 16146 Genova, Italy
14Institute of Theoretical and Experimental Physics, 25 B. Cheremushkinskaya, Moscow, 117259, Russia
15Institut de Physique Nucleaire d’Orsay, IN2P3, Boîte Postale 1, 91406 Orsay, France
16James Madison University, Department of Physics, Harrisonburg, Virginia 22807, USA
17Thomas Jefferson National Accelerator Facility, 12000 Jefferson Avenue, Newport News, Virginia 23606, USA
18Kyungpook National University, Taegu 702-701, South Korea
19M.I.T.-Bates Linear Accelerator, Middleton, Massachusetts 01949, USA
20Norfolk State University, Norfolk, Virginia 23504, USA
21Old Dominion University, Norfolk, Virginia 23529, USA
22Ohio University, Athens, Ohio 45701, USA
23Rice University, Bonner Lab, Box 1892, Houston, Texas 77251, USA
24CEA Saclay, DAPNIA-SPhN, F91191 Gif-sur-Yvette Cedex, France
25Union College, Schenectady, New York 12308, USA
26University of California at Los Angeles, Los Angeles, California 90095, USA
27University of Connecticut, Storrs, Connecticut 06269, USA
28University of Massachusetts, Amherst, Massachusetts 01003, USA
29University of Moscow, Moscow 119899 Russia
30University of New Hampshire, Durham, New Hampshire 03824, USA
31University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
32University of Richmond, Richmond, Virginia 23173, USA
33University of South Carolina, Columbia, South Carolina 29208, USA
34University of Texas at El Paso, El Paso, Texas 79968, USA
35University of Virginia, Charlottesville, Virginia 22903, USA
36Virginia Polytechnic and State University, Blacksburg, Virginia 24061, USA
37Yerevan Physics Institute, 375036 Yerevan, Armenia
Received 17 March 2003; published 11 September 2003
Measurements of the angular distributions of target and double-spin asymmetries for the Δ+(1232) in the exclusive channel p⃗(e⃗,e′p)π0 obtained at the Jefferson Lab in the Q2 range from 0.5 to 1.5GeV2/c2 are presented. Results of the asymmetries are compared with the unitary isobar model [D. Drechsel et al., Nucl. Phys. A645, 145 (1999)], dynamical models [T. Sato and T. S. Lee, Phys. Rev. C 54, 2660 (1996); S. S. Kamalov et al., Phys. Lett. B 27, 522 (2001)], and the effective Lagrangian theory [R. M. Davidson et al., Phys. Rev. D 43, 71 (1991)]. Sensitivity to the different models was observed, particularly in relation to the description of background terms on which the target asymmetry depends significantly.
© 2003 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevC.68.035202
DOI:
10.1103/PhysRevC.68.035202
PACS:
13.60.Le, 13.88.+e, 14.20.Gk
*Corresponding author. Email address: biselli@jlab.org
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