Phys. Rev. C
78,
045204
(2008)
[11 pages]
First measurement of target and double spin asymmetries for e⃗p⃗→epπ0 in the nucleon resonance region above the Δ(1232)
A. S. Biselli et al.
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A. S. Biselli11,*, V. D. Burkert34, M. J. Amaryan29, G. Asryan39, H. Avakian34, H. Bagdasaryan29, N. Baillie38, J. P. Ball2, N. A. Baltzell33, M. Battaglieri19, I. Bedlinskiy21, M. Bellis5, N. Benmouna15, B. L. Berman15, L. Blaszczyk14, C. Bookwalter14, S. Boiarinov34, P. Bosted34, R. Bradford5, D. Branford10, W. J. Briscoe15, W. K. Brooks12, S. Bültmann29, C. Butuceanu38, J. R. Calarco26, S. L. Careccia29, D. S. Carman34, L. Casey6, S. Chen14, L. Cheng6, P. L. Cole17, P. Collins2, P. Coltharp14, D. Crabb37, V. Crede14, D. Dale17, N. Dashyan39, R. De Masi7, R. De Vita19, E. De Sanctis18, P. V. Degtyarenko34, A. Deur34, S. Dhamija13, R. Dickson5, C. Djalali33, G. E. Dodge29, D. Doughty8,34, M. Dugger2, O. P. Dzyubak33, H. Egiyan34,†, L. El Fassi1, L. Elouadrhiri34, P. Eugenio14, G. Fedotov25, R. Feuerbach5, R. Fersch38, T. A. Forest17, A. Fradi20, M. Garçon7, G. Gavaliann29,†, N. Gevorgyan39, G. P. Gilfoyle32, K. L. Giovanetti22, F. X. Girod7, J. T. Goetz3, W. Gohn9, R. W. Gothe33, L. Graham33, K. A. Griffioen38, M. Guidal20, N. Guler29, L. Guo34, V. Gyurjyan34, K. Hafidi1, H. Hakobyan39, C. Hanretty14, N. Hassall16, K. Hicks28, I. Hleiqawi28, M. Holtrop26, C. E. Hyde-Wright29, Y. Ilieva15,‡, D. G. Ireland16, B. S. Ishkhanov25, E. L. Isupov25, M. M. Ito34, D. Jenkins36, H. S. Jo20, J. R. Johnstone16, K. Joo9, H. G. Juengst29, N. Kalantarians29, D. Keller28, J. D. Kellie16, M. Khandaker27, W. Kim23, A. Klein29, F. J. Klein6, M. Kossov21, Z. Krahn5, V. Kubarovsky34, J. Kuhn5, S. E. Kuhn29, S. V. Kuleshov21, V. Kuznetsov23, J. Lachniet29, J. M. Laget34,§, J. Langheinrich33, D. Lawrence24, K. Livingston16, H. Y. Lu33, M. MacCormick20, N. Markov9, P. Mattione31, B. McKinnon16, J. W. C. McNabb5, B. A. Mecking34, M. D. Mestayer34, C. A. Meyer5, T. Mibe28, K. Mikhailov21, M. Mirazita18, V. Mokeev25,34, B. Moreno20, K. Moriya5, S. A. Morrow7,20, M. Moteabbed13, E. Munevar15, G. S. Mutchler31, P. Nadel-Turonski15, R. Nasseripour33,**, S. Niccolai20, G. Niculescu22, I. Niculescu22, B. B. Niczyporuk34, M. R. Niroula29, R. A. Niyazov30, M. Nozar34, M. Osipenko19,25, A. I. Ostrovidov14, K. Park33, S. Park14, E. Pasyuk2, C. Paterson16, S. Anefalos Pereira18, J. Pierce37, N. Pivnyuk21, O. Pogorelko21, S. Pozdniakov21, J. W. Price4, Y. Prok37,††, D. Protopopescu16, B. A. Raue13,34, G. Ricco19, M. Ripani19, B. G. Ritchie2, G. Rosner16, P. Rossi18, F. Sabatié7, M. S. Saini14, J. Salamanca17, C. Salgado27, J. P. Santoro6, V. Sapunenko34, D. Schott13, R. A. Schumacher5, V. S. Serov21, Y. G. Sharabian34, D. Sharov25, N. V. Shvedunov25, E. S. Smith34, D. I. Sober6, D. Sokhan10, A. Stavinsky21, S. S. Stepanyan23, S. Stepanyan34, B. E. Stokes14, P. Stoler30, I. I. Strakovsky15, S. Strauch33, M. Taiuti19, D. J. Tedeschi33, A. Tkabladze15,‡‡, S. Tkachenko29, L. Todor5, M. Ungaro9, M. F. Vineyard35, A. V. Vlassov21, D. P. Watts16,a, L. B. Weinstein29, D. P. Weygand34, M. Williams5, E. Wolin34, M. H. Wood33,b, A. Yegneswaran34, M. Yurov23, L. Zana26, J. Zhang29, B. Zhao9, and Z. W. Zhao33
1Argonne National Laboratory, Argonne, Illinois 60439, USA
2Arizona State University, Tempe, Arizona 85287-1504, USA
3University of California, Los Angeles, California 90095-1547, USA
4California State University, Dominguez Hills, Carson, California 90747, USA
5Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
6Catholic University of America, Washington, D.C. 20064, USA
7CEA-Saclay, Service de Physique Nucléaire, F-91191 Gif-sur-Yvette, France
8Christopher Newport University, Newport News, Virginia 23606, USA
9University of Connecticut, Storrs, Connecticut 06269, USA
10Edinburgh University, Edinburgh EH9 3JZ, United Kingdom
11Fairfield University, Fairfield, Connecticut 06824, USA
12Universidad Técnica Federico Santa María, Casilla 110-V, Valparaí so, Chile
13Florida International University, Miami, Florida 33199, USA
14Florida State University, Tallahassee, Florida 32306, USA
15The George Washington University, Washington, D.C. 20052, USA
16University of Glasgow, Glasgow G12 8QQ, United Kingdom
17Idaho State University, Pocatello, Idaho 83209, USA
18INFN, Laboratori Nazionali di Frascati, I-00044 Frascati, Italy
19INFN, Sezione di Genova, I-16146 Genova, Italy
20Institut de Physique Nucleaire ORSAY, Orsay, France
21Institute of Theoretical and Experimental Physics, Moscow RU-117259, Russia
22James Madison University, Harrisonburg, Virginia 22807, USA
23Kyungpook National University, Daegu 702-701, Republic of Korea
24University of Massachusetts, Amherst, Massachusetts 01003, USA
25Moscow State University, General Nuclear Physics Institute, Moscow RU-119899, Russia
26University of New Hampshire, Durham, New Hampshire 03824-3568, USA
27Norfolk State University, Norfolk, Virginia 23504, USA
28Ohio University, Athens, Ohio 45701, USA
29Old Dominion University, Norfolk, Virginia 23529, USA
30Rensselaer Polytechnic Institute, Troy, New York 12180-3590, USA
31Rice University, Houston, Texas 77005-1892, USA
32University of Richmond, Richmond, Virginia 23173, USA
33University of South Carolina, Columbia, South Carolina 29208, USA
34Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
35Union College, Schenectady, New York 12308, USA
36Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0435, USA
37University of Virginia, Charlottesville, Virginia 22901, USA
38College of William and Mary, Williamsburg, Virginia 23187-8795, USA
39Yerevan Physics Institute, 375036 Yerevan, Armenia
Received 18 April 2008; published 16 October 2008
The exclusive channel p⃗(e⃗,e'p)π0 was studied in the first and second nucleon resonance regions in the Q2 range from 0.187 to 0.770 GeV2 at Jefferson Lab using the CEBAF Large Acceptance Spectrometer. Longitudinal target and beam-target asymmetries were extracted over a large range of center-of-mass angles of the π0 and compared to the unitary isobar model MAID, the dynamic model by Sato and Lee, and the dynamic model DMT. A strong sensitivity to individual models was observed, in particular for the target asymmetry and in the higher invariant mass region. This data set, once included in the global fits of the above models, is expected to place strong constraints on the electrocoupling amplitudes A1/2 and S1/2 for the Roper resonance N(1400)P11 and the N(1535)S11 and N(1520)D13 states.
© 2008 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevC.78.045204
DOI:
10.1103/PhysRevC.78.045204
PACS:
13.60.Le, 13.88.+e, 14.20.Gk, 24.30.Gd
*biselli@jlab.org †Current address: University of New Hampshire, Durham, New Hampshire 03824-3568, USA. ‡Current address: University of South Carolina, Columbia, South Carolina 29208, USA. §Current address: CEA-Saclay, Service de Physique Nucléaire, 91191 Gif-sur-Yvette, France. **Current address: The George Washington University, Washington, D.C., 20052, USA. ††Current address: Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA. ‡‡Current address: Ohio University, Athens, Ohio 45701, USA. aCurrent address: Edinburgh University, Edinburgh EH9 3JZ, United Kingdom. bCurrent address: University of Massachusetts, Amherst, Massachusetts 01003, USA.
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