Phys. Rev. C
72,
058202
(2005)
[5 pages]
Measurement of the polarized structure function σLT' for pion electroproduction in the Roper-resonance region
K. Joo et al. CLAS Collaboration
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K. Joo1, L. C. Smith2, I. G. Aznauryan3, V. D. Burkert4, H. Egiyan38,4,*, R. Minehart2, G. Adams32, P. Ambrozewicz13, E. Anciant9, M. Anghinolfi19, B. Asavapibhop25, G. Asryan3, G. Audit9, T. Auger9, H. Avakian18,4, H. Bagdasaryan30, N. Baillie38, J. P. Ball5, N. A. Baltzell35, S. Barrow14, V. Batourine23, M. Battaglieri19, K. Beard22, I. Bedlinskiy21, M. Bektasoglu29,†, M. Bellis7, N. Benmouna15, B. L. Berman15, N. Bianchi18, A. S. Biselli32,7, B. E. Bonner33, S. Bouchigny4,20, S. Boiarinov21,4, R. Bradford7, D. Branford12, W. J. Briscoe15, W. K. Brooks4, S. Bueltmann30, C. Butuceanu38, J. R. Calarco27, S. L. Careccia30, D. S. Carman29, B. Carnahan8, C. Cetina15, S. Chen14, P. L. Cole4,17, A. Coleman38,‡, P. Coltharp14, D. Cords4, P. Corvisiero19, D. Crabb2, J. P. Cummings32, E. De Sanctis18, R. DeVita19, P. V. Degtyarenko4, L. Dennis14, A. Deur4, K. V. Dharmawardane30, K. S. Dhuga15, C. Djalali35, G. E. Dodge30, J. Donnelly16, D. Doughty10,4, P. Dragovitsch14, M. Dugger5, S. Dytman31, O. P. Dzyubak35, K. S. Egiyan3, L. Elouadrhiri10,4, A. Empl32, P. Eugenio14, L. Farhi9, R. Fatemi2, G. Fedotov26, G. Feldman15, R. J. Feuerbach7, T. A. Forest30, V. Frolov32, H. Funsten38, S. J. Gaff11, M. Garçon9, G. Gavalian30, G. P. Gilfoyle34, K. L. Giovanetti22, P. Girard35, F. X. Girod9, J. T. Goetz6, R. W. Gothe35, K. A. Griffioen38, M. Guidal20, M. Guillo35, N. Guler30, L. Guo4, V. Gyurjyan4, R. S. Hakobyan8, J. Hardie10,4, D. Heddle10,4, F. W. Hersman27, K. Hicks29, I. Hleiqawi29, M. Holtrop27, J. Hu32, C. E. Hyde-Wright30, Y. Ilieva15, D. G. Ireland16, B. S. Ishkhanov26, M. M. Ito4, D. Jenkins37, H. S. Jo20, H. G. Juengst15, J. H. Kelley11, J. D. Kellie16, M. Khandaker28, K. Y. Kim31, K. Kim23, W. Kim23, A. Klein30, F. J. Klein4,8, A. V. Klimenko30, M. Klusman32, M. Kossov21, L. H. Kramer13,4, V. Kubarovsky32, J. Kuhn7, S. E. Kuhn30, J. Lachniet7, J. M. Laget4,9, J. Langheinrich35, D. Lawrence25, T. Lee27, K. Livingston16, K. Lukashin4,§, J. J. Manak4, C. Marchand9, L. C. Maximon15, S. McAleer14, B. McKinnon16, J. W. C. McNabb7, B. A. Mecking4, M. D. Mestayer4, C. A. Meyer7, K. Mikhailov21, M. Mirazita18, R. Miskimen25, V. Mokeev26,4, S. A. Morrow9,20, V. Muccifora18, J. Mueller31, G. S. Mutchler33, P. Nadel-Turonski15, J. Napolitano32, R. Nasseripour13,**, S. O. Nelson11, S. Niccolai20, G. Niculescu29,22, I. Niculescu15,22, B. B. Niczyporuk4, R. A. Niyazov4, M. Nozar4, G. V. O'Rielly15, M. Osipenko19,26, A. I. Ostrovidov14, K. Park23, E. Pasyuk5, G. Peterson25, S. A. Philips15, J. Pierce2, N. Pivnyuk21, D. Pocanic2, O. Pogorelko21, E. Polli18, S. Pozdniakov21, B. M. Preedom35, J. W. Price6, Y. Prok4,††, D. Protopopescu16, L. M. Qin30, B. A. Raue13,4, G. Riccardi14, G. Ricco19, M. Ripani19, B. G. Ritchie5, F. Ronchetti18, G. Rosner16, P. Rossi18, D. Rowntree24, P. D. Rubin34, F. Sabatié9, K. Sabourov11, C. Salgado28, J. P. Santoro37,4, V. Sapunenko19,4, R. A. Schumacher7, V. S. Serov21, A. Shafi15, Y. G. Sharabian3,4, J. Shaw25, S. Simionatto15, A. V. Skabelin24, E. S. Smith4, D. I. Sober8, M. Spraker11, A. Stavinsky21, S. S. Stepanyan23, S. Stepanyan4,3, B. E. Stokes14, P. Stoler32, I. I. Strakovsky15, S. Strauch15, M. Taiuti19, S. Taylor33, D. J. Tedeschi35, U. Thoma4,‡‡, R. Thompson31, A. Tkabladze29, C. Tur35, M. Ungaro1, M. F. Vineyard36,34, A. V. Vlassov21, K. Wang2, L. B. Weinstein30, H. Weller11, D. P. Weygand4, M. Williams7, E. Wolin4, M. H. Wood35,a, A. Yegneswaran4, J. Yun30, L. Zana27, and J. Zhang30 (CLAS Collaboration)
1University of Connecticut, Storrs, Connecticut 06269, USA
2University of Virginia, Charlottesville, Virginia 22901, USA
3Yerevan Physics Institute, 375036 Yerevan, Armenia
4Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
5Arizona State University, Tempe, Arizona 85287-1504, USA
6University of California at Los Angeles, Los Angeles, California 90095-1547, USA
7Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
8Catholic University of America, Washington, DC 20064, USA
9CEA-Saclay, Service de Physique Nucléaire, F-91191 Gif-sur-Yvette, France
10Christopher Newport University, Newport News, Virginia 23606, USA
11Duke University, Durham, North Carolina 27708-0305, USA
12Edinburgh University, Edinburgh EH9 3JZ, United Kingdom
13Florida International University, Miami, Florida 33199, USA
14Florida State University, Tallahassee, Florida 32306, USA
15The George Washington University, Washington, DC 20052, USA
16University of Glasgow, Glasgow G12 8QQ, United Kingdom
17Idaho State University, Pocatello, Idaho 83209, USA
18INFN, Laboratori Nazionali di Frascati, Frascati, Italy
19INFN, Sezione di Genova, I-16146 Genova, Italy
20Institut de Physique Nucleaire ORSAY, Orsay, France
21Institute of Theoretical and Experimental Physics, Moscow 117259, Russia
22James Madison University, Harrisonburg, Virginia 22807, USA
23Kyungpook National University, Daegu 702-701, South Korea
24Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA
25University of Massachusetts, Amherst, Massachusetts 01003, USA
26Moscow State University, Skobeltsyn 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
31University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
32Rensselaer Polytechnic Institute, Troy, New York 12180-3590, USA
33Rice University, Houston, Texas 77005-1892, USA
34University of Richmond, Richmond, Virginia 23173, USA
35University of South Carolina, Columbia, South Carolina 29208, USA
36Union College, Schenectady, New York 12308, USA
37Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0435, USA
38College of William and Mary, Williamsburg, Virginia 23187-8795, USA
Received 25 April 2005; published 21 November 2005
The polarized longitudinal-transverse structure function σLT' measures the interference between real and imaginary amplitudes in pion electroproduction and can be used to probe the coupling between resonant and nonresonant processes. We report new measurements of σLT' in the N(1440)1/2+ (Roper) resonance region at Q2=0.40 and 0.65GeV2 for both the π0p and π+n channels. The experiment was performed at Jefferson Lab with the CEBAF Large Acceptance Spectrometer (CLAS) using longitudinally polarized electrons at a beam energy of 1.515 GeV. Complete angular distributions were obtained and are compared to recent phenomenological models. The σLT'(π+n) channel shows a large sensitivity to the Roper-resonance multipoles M1- and S1- and provides new constraints on models of resonance formation.
© 2005 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevC.72.058202
DOI:
10.1103/PhysRevC.72.058202
PACS:
13.60.Le, 14.20.Gk, 13.40.Gp, 13.88.+e
*Current address: University of New Hampshire, Durham, New Hampshire 03824-3568. †Current address: Sakarya University, Sakarya, Turkey. ‡Current address: Systems Planning and Analysis, Alexandria, Virginia 22311. §Current address: Catholic University of America, Washington, DC 20064. **Current address: University of South Carolina, Columbia, South Carolina 29208. ††Current address: Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307. ‡‡Current address: Physikalisches Institut der Universitaet Giessen, D-35392 Giessen, Germany. aCurrent address: University of Massachusetts, Amherst, Massachusetts 01003.
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