Phys. Rev. C
70,
042201(R)
(2004)
[6 pages]
Measurement of the polarized structure function σLT′ for p(e⃗,e′π+)n in the Δ(1232) resonance region
K. Joo et al. The CLAS Collaboration
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K. Joo1, L. C. Smith2, I. G. Aznauryan40, V. D. Burkert3, R. Minehart2, G. Adams33, P. Ambrozewicz12, E. Anciant5, M. Anghinolfi18, B. Asavapibhop25, G. Asryan40, G. Audit5, T. Auger5, H. Avakian3,17, H. Bagdasaryan30, J. P. Ball4, S. Barrow13, V. Batourine23, M. Battaglieri18, K. Beard22, M. Bektasoglu29,30,*, N. Benmouna15, N. Bianchi17, A. S. Biselli7, S. Boiarinov3,21, B. E. Bonner34, S. Bouchigny20, R. Bradford7, D. Branford11, W. J. Briscoe15, W. K. Brooks3, S. Bültmann30, C. Butuceanu39, J. R. Calarco27, D. S. Carman29, B. Carnahan8, C. Cetina7,15, S. Chen13, L. Ciciani30, P. L. Cole19,3, D. Cords3,†, P. Corvisiero18, D. Crabb2, H. Crannell8, J. P. Cummings33, E. De Sanctis17, R. DeVita18, P. V. Degtyarenko3, L. Dennis13, A. Deur3, K. V. Dharmawardane30, K. S. Dhuga15, C. Djalali36, G. E. Dodge30, D. Doughty9,3, P. Dragovitsch13, M. Dugger4, S. Dytman32, O. P. Dzyubak36, H. Egiyan3, K. S. Egiyan40, L. Elouadrhiri3,9, A. Empl33, P. Eugenio13, R. Fersch39, R. J. Feuerbach3, T. A. Forest30, H. Funsten39, S. J. Gaff10, M. Garçon5, G. Gavalian27,40, S. Gilad24, G. P. Gilfoyle35, K. L. Giovanetti22, R. W. Gothe36, K. A. Griffioen39, M. Guidal20, M. Guillo36, N. Guler30, L. Guo3, V. Gyurjyan3, C. Hadjidakis20, R. S. Hakobyan8, J. Hardie9, D. Heddle9,3, F. W. Hersman27, K. Hicks29, I. Hleiqawi29, M. Holtrop27, J. Hu33, C. E. Hyde-Wright30, Y. Ilieva15, D. Ireland16, M. M. Ito3, D. Jenkins38, H. G. Juengst15, J. D. Kellie16, J. H. Kelley10, M. Khandaker28, K. Y. Kim32, K. Kim23, W. Kim23, A. Klein30, F. J. Klein8,3, A. V. Klimenko30, M. Klusman33, M. Kossov21, V. Koubarovski33, L. H. Kramer12,3, S. E. Kuhn30, J. Kuhn7, J. Lachniet7, J. M. Laget5, J. Langheinrich36, D. Lawrence25, T. Lee27, K. Livingston16, K. Lukashin8,3, J. J. Manak3, C. Marchand5, S. McAleer13, J. W. C. McNabb31, B. A. Mecking3, M. D. Mestayer3, C. A. Meyer7, K. Mikhailov21, M. Mirazita17, R. Miskimen25, V. Mokeev26, L. Morand5, S. A. Morrow5,20, V. Muccifora17, J. Mueller32, G. S. Mutchler34, J. Napolitano33, R. Nasseripour12, S. O. Nelson10, S. Niccolai20, G. Niculescu22,29, I. Niculescu22,15, B. B. Niczyporuk3, R. A. Niyazov3,30, M. Nozar3, G. V. O’Rielly15, M. Osipenko18, A. I. Ostrovidov13, K. Park23, E. Pasyuk4, G. Peterson25, S. A. Philips15, N. Pivnyuk21, D. Pocanic2, O. Pogorelko21, E. Polli17, S. Pozdniakov21, B. M. Preedom36, J. W. Price6, Y. Prok2, D. Protopopescu16, L. M. Qin30, B. A. Raue12, G. Riccardi13, G. Ricco18, M. Ripani18, B. G. Ritchie4, F. Ronchetti17, G. Rosner16, P. Rossi17, D. Rowntree25, P. D. Rubin35, F. Sabatié5, K. Sabourov10, C. Salgado28, J. P. Santoro38, V. Sapunenko3,18, R. A. Schumacher7, V. S. Serov21, Y. G. Sharabian3,40, J. Shaw25, S. Simionatto15, A. V. Skabelin24, E. S. Smith3, D. I. Sober8, M. Spraker10, A. Stavinsky21, S. Stepanyan3, S. S. Stepanyan23, B. E. Stokes13, P. Stoler33, I. I. Strakovsky15, S. Strauch15, M. Taiuti18, S. Taylor34, D. J. Tedeschi36, U. Thoma14,3, R. Thompson32, A. Tkabladze29, L. Todor35, C. Tur36, M. Ungaro1, M. F. Vineyard37, A. V. Vlassov21, K. Wang2, L. B. Weinstein30, H. Weller10, D. P. Weygand3, M. Williams7, E. Wolin3, M. H. Wood36, A. Yegneswaran3, J. Yun30, L. Zana27, and The CLAS Collaboration
1University of Connecticut, Storrs, Connecticut 06269, USA
2University of Virginia, Charlottesville, Virginia 22901, USA
3Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
4Arizona State University, Tempe, Arizona 85287-1504, USA
5CEA-Saclay, Service de Physique Nucléaire, F91191 Gif-sur-Yvette, Cedex, France
6University of California at Los Angeles, Los Angeles, California 90095-1547, USA
7Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
8Catholic University of America, Washington, D.C. 20064, USA
9Christopher Newport University, Newport News, Virginia 23606, USA
10Duke University, Durham, North Carolina 27708-0305, USA
11Edinburgh University, Edinburgh EH9 3JZ, United Kingdom
12Florida International University, Miami, Florida 33199, USA
13Florida State University, Tallahassee, Florida 32306, USA
14Physikalisches Institut der Universitaet Giessen, 35392 Giessen, Germany
15The George Washington University, Washington, D.C. 20052, USA
16University of Glasgow, Glasgow G12 8QQ, United Kingdom
17INFN, Laboratori Nazionali di Frascati, Frascati, Italy
18INFN, Sezione di Genova, 16146 Genova, Italy
19Idaho State University, Pocatello, Idaho 83209, USA
20Institut de Physique Nucleaire ORSAY, Orsay, France
21Institute of Theoretical and Experimental Physics, Moscow, 117259, Russia
22James Madison University, Harrisonburg, Virginia 22807, USA
23Kungpook National University, Taegu 702-701, South Korea
24Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA
25University of Massachusetts, Amherst, Massachusetts 01003, USA
26Moscow State University, General Nuclear Physics Institute, 119899 Moscow, Russia
27University of New Hampshire, Durham, New Hampshire 03824-3568, USA
28Norfolk State University, Norfolk, Virginia 23504, USA
29Ohio University, Athens, Ohio 45701, USA
30Old Dominion University, Norfolk, Virginia 23529, USA
31Penn State University, University Park, Pennsylvania 16802, USA
32University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
33Rensselaer Polytechnic Institute, Troy, New York 12180-3590, USA
34Rice University, Houston, Texas 77005-1892, USA
35University of Richmond, Richmond, Virginia 23173, USA
36University of South Carolina, Columbia, South Carolina 29208, USA
37Union College, Schenectady, New York 12308, USA
38Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0435, USA
39College of William and Mary, Williamsburg, Virginia 23187-8795, USA
40Yerevan Physics Institute, 375036 Yerevan, Armenia
Received 15 July 2004; published 25 October 2004
The polarized longitudinal-transverse structure function σLT′ has been measured using the p(e⃗,e′π+)n reaction in the Δ(1232) resonance region at Q2=0.40 and 0.65 GeV2. No previous σLT′ data exist for this reaction channel. The kinematically complete experiment was performed at the Jefferson Lab with the CEBAF large acceptance spectrometer using longitudinally polarized electrons at an energy of 1.515 GeV. A partial-wave analysis of the data shows generally better agreement with recent phenomenological models of pion electroproduction compared to the previously measured π0p channel. A fit to both π0p and π+n channels using a unitary isobar model suggests the unitarized Born terms provide a consistent description of the nonresonant background. The t-channel pion pole term is important in the π0p channel through a rescattering correction, which could be model dependent.
© 2004 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevC.70.042201
DOI:
10.1103/PhysRevC.70.042201
PACS:
13.60.Le, 12.40.Nn, 13.40.Gp
*Current address: Sakarya University, Sakarya, Turkey. †Deceased.
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