Phys. Rev. C
73,
025204
(2006)
[32 pages]
Single π+ electroproduction on the proton in the first and second resonance regions at 0.25 GeV2<Q2<0.65 GeV2
H. Egiyan et al. CLAS Collaboration
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H. Egiyan1,2, I. G. Aznauryan4, V. D. Burkert1, K. A. Griffioen2, K. Joo1,11, R. Minehart3, L. C. Smith3, G. Adams34, P. Ambrozewicz14, E. Anciant6, M. Anghinolfi19, B. Asavapibhop26, G. Audit6, T. Auger6, H. Avakian1,18, H. Bagdasaryan31, J. P. Ball5, N. Baltzel37, S. Barrow15, M. Battaglieri19, K. Beard23, M. Bektasoglu30,*, M. Bellis34, N. Benmouna16, N. Bianchi18, A. S. Biselli34,8, S. Boiarinov1, B. E. Bonner35, S. Bouchigny20, R. Bradford8, D. Branford13, W. J. Briscoe16, W. K. Brooks1, C. Butuceanu2, J. R. Calarco28, S. L. Careccia31, D. S. Carman30, B. Carnahan9, C. Cetina16, S. Chen15, P. L. Cole38, A. Coleman2, D. Cords1, P. Corvisiero19, D. Crabb3, H. Crannell9, J. P. Cummings34, E. DeSanctis18, R. DeVita19, P. V. Degtyarenko1, H. Denizli32, L. Dennis15, K. V. Dharmawardane31, C. Djalali37, G. E. Dodge31, J. Donnely17, D. Doughty1,10, P. Dragovitsch15, M. Dugger5, S. Dytman32, O. P. Dzyubak37, M. Eckhause2, K. S. Egiyan4, L. Elouadrhiri1, A. Empl34, P. Eugenio15, R. Fatemi3, G. Fedotov27, G. Feldman16, R. J. Feuerbach8, T. A. Forest31, H. Funsten2, S. J. Gaff12, M. Gai11, G. Gavalian31, S. Gilad25, G. P. Gilfoyle36, K. L. Giovanetti23, P. Girard37, G. T. Goetz7, C. I. O. Gordon17, R. Gothe37, M. Guidal20, M. Guillo37, N. Guler31, L. Guo1, V. Gyurjyan1, C. Hadjidakis20, R. S. Hakobyan9, J. Hardie1,10, D. Heddle1,10, F. W. Hersman28, K. Hicks30, R. S. Hicks26, I. Hleiqawi30, M. Holtrop28, J. Hu34, C. E. Hyde-Wright31, Y. Ilieva16, D. G. Ireland17, B. Ishkhanov27, M. M. Ito1, D. Jenkins40, H. G. Juengst16, J. H. Kelley12, J. D. Kellie17, M. Khandaker29, D. H. Kim24, K. Y. Kim32, K. Kim24, M. S. Kim24, W. Kim24, A. Klein31, F. J. Klein1,9, A. V. Klimenko31, M. Klusman34, M. Kossov22, L. H. Kramer14, Y. Kuang2, V. Kubarovsky34, S. E. Kuhn31, J. Kuhn8, J. Lachniet8, J. M. Laget1,6, J. Langheinrich37, D. Lawrence26, Ji Li34, K. Livingston17, A. Longhi9, K. Lukashin1,9, J. J. Manak1, C. Marchand6, S. McAleer15, B. McKinnon17, J. W. C. McNabb8, B. A. Mecking1, S. Mehrabyan32, J. J. Melone17, M. D. Mestayer1, C. A. Meyer8, K. Mikhailov22, M. Mirazita18, R. Miskimen26, V. Mokeev1,27, L. Morand6, S. A. Morrow6,20, V. Muccifora18, J. Mueller32, L. Y. Murphy16, G. S. Mutchler35, J. Napolitano34, R. Nasseripour14, S. O. Nelson12, S. Niccolai16,20, G. Niculescu30, I. Niculescu16,23, B. B. Niczyporuk1, R. A. Niyazov1, M. Nozar1, G. V. O'Rielly16, M. Osipenko19, K. Park24, E. Pasyuk5, G. Peterson26, S. A. Philips16, N. Pivnyuk22, D. Pocanic3, O. Pogorelko22, E. Polli18, S. Pozdniakov22, B. M. Preedom37, J. W. Price7, Y. Prok3, D. Protopopescu17, L. M. Qin31, B. A. Raue14, G. Riccardi15, G. Ricco19, M. Ripani19, B. G. Ritchie5, F. Ronchetti18,33, G. Rosner17, P. Rossi18, D. Rowntree25, P. D. Rubin36, F. Sabatié6, K. Sabourov12, C. Salgado29, J. P. Santoro40, V. Sapunenko19, M. Sargsyan14, R. A. Schumacher8, V. S. Serov22, A. Shafi16, Y. G. Sharabian1,4, J. Shaw26, S. Simionatto16, A. V. Skabelin25, E. S. Smith1, D. I. Sober9, M. Spraker12, A. Stavinsky22, S. Stepanyan1,31, P. Stoler34, I. I. Strakovsky16, S. Strauch16, M. Taiuti19, S. Taylor35, D. J. Tedeschi37, U. Thoma1,21, R. Thompson32, A. Tkabladze30, L. Todor8, C. Tur37, M. Ungaro34, M. F. Vineyard36,39, A. V. Vlassov22, K. Wang3, L. B. Weinstein31, H. Weller12, D. P. Weygand1, C. S. Whisnant23,37, E. Wolin1, M. H. Wood37, A. Yegneswaran1, J. Yun31, J. Zhang31, J. Zhao25, and Z. Zhou25 (CLAS Collaboration)
1Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
2College of William and Mary, Williamsburg, Virginia 23187-8795, USA
3University of Virginia, Charlottesville, Virginia 22901, USA
4Yerevan Physics Institute, 375036 Yerevan, Armenia
5Arizona State University, Tempe, Arizona 85287-1504, USA
6CEA-Saclay, Service de Physique Nucléaire, F-91191 Gif-sur-Yvette, France
7University of California at Los Angeles, Los Angeles, California 90095-1547, USA
8Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
9Catholic University of America, Washington, DC 20064, USA
10Christopher Newport University, Newport News, Virginia 23606, USA
11University of Connecticut, Storrs, Connecticut 06269, USA
12Duke University, Durham, North Carolina 27708-0305, USA
13Edinburgh University, Edinburgh EH9 3JZ, United Kingdom
14Florida International University, Miami, Florida 33199, USA
15Florida State University, Tallahassee, Florida 32306, USA
16The George Washington University, Washington, DC 20052, USA
17University of Glasgow, Glasgow G12 8QQ, United Kingdom
18INFN, Laboratori Nazionali di Frascati, Frascati, Italy
19INFN, Sezione di Genova, I-16146 Genova, Italy
20Institut de Physique Nucleaire ORSAY, Orsay, France
21Institute für Strahlen und Kernphysik, Universität Bonn, Germany
22Institute of Theoretical and Experimental Physics, RU-117259 Moscow, Russia
23James Madison University, Harrisonburg, Virginia 22807, USA
24Kungpook National University, Daegu 702-701, South Korea
25Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA
26University of Massachusetts, Amherst, Massachusetts 01003, USA
27Moscow State University, Skabeltsin Nuclear Physics Institute, RU-119899 Moscow, Russia
28University of New Hampshire, Durham, New Hampshire 03824-3568, USA
29Norfolk State University, Norfolk, Virginia 23504, USA
30Ohio University, Athens, Ohio 45701, USA
31Old Dominion University, Norfolk, Virginia 23529, USA
32University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
33Universita’ di ROMA III, I-00146 Roma, Italy
34Rensselaer Polytechnic Institute, Troy, New York 12180-3590, USA
35Rice University, Houston, Texas 77005-1892, USA
36University of Richmond, Richmond, Virginia 23173, USA
37University of South Carolina, Columbia, South Carolina 29208, USA
38University of Texas at El Paso, El Paso, Texas 79968, USA
39Union College, Schenectady, New York 12308, USA
40Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0435, USA
Received 27 October 2005; published 24 February 2006
The ep→e'π+n reaction was studied in the first and second nucleon resonance regions in the 0.25 GeV2<Q2<0.65 GeV2 range by use of the CLAS detector at Thomas Jefferson National Accelerator Facility. For the first time, to our knowledge, the absolute cross sections were measured, covering nearly the full angular range in the hadronic center-of-mass frame. We extracted the structure functions σTL,σTT, and the linear combination σT+εσL by fitting the ϕ dependence of the measured cross sections and compared them with the MAID and Sato-Lee models.
© 2006 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevC.73.025204
DOI:
10.1103/PhysRevC.73.025204
PACS:
13.60.Rj, 14.20.Dh, 25.30.Rw
*Current Address: Sakarya University, Sakarya, Turkey.
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