Phys. Rev. C
76,
015204
(2007)
[14 pages]
Q2 dependence of the S11(1535) photocoupling and evidence for a P-wave resonance in η electroproduction
H. Denizli et al. CLAS Collaboration
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H. Denizli1,32, J. Mueller32, S. Dytman32, M. L. Leber32, R. D. Levine32, J. Miles32, K. Y. Kim32, G. Adams33, M. J. Amaryan31, P. Ambrozewicz14, M. Anghinolfi20, B. Asavapibhop26, G. Asryan42, H. Avakian19,37, H. Bagdasaryan31, N. Baillie41, J. P. Ball3, N. A. Baltzell36, S. Barrow15, V. Batourine24, M. Battaglieri20, K. Beard23, I. Bedlinskiy22, M. Bektasoglu31,*, M. Bellis6, N. Benmouna16, N. Bianchi19, A. S. Biselli13,33, B. E. Bonner34, S. Bouchigny21,37, S. Boiarinov22,37, R. Bradford6, D. Branford12, W. J. Briscoe16, W. K. Brooks37, S. Bültmann31, V. D. Burkert37, C. Butuceanu41, J. R. Calarco28, S. L. Careccia31, D. S. Carman37, C. Cetina16, S. Chen15, P. L. Cole18,37, A. Coleman41,†, P. Collins3, P. Coltharp15, D. Cords37,‡, P. Corvisiero20, D. Crabb40, V. Crede15, J. P. Cummings33, N. Dashyan42, R. De Vita20, E. De Sanctis19, P. V. Degtyarenko37, L. Dennis15, A. Deur37, K. S. Dhuga16, R. Dickson6, C. Djalali36, G. E. Dodge31, J. Donnelly17, D. Doughty9,37, P. Dragovitsch15, M. Dugger3, O. P. Dzyubak36, H. Egiyan37,41,§, K. S. Egiyan42,‡, L. El Fassi2, L. Elouadrhiri9,37, A. Empl33, P. Eugenio15, L. Farhi8, R. Fatemi40, G. Fedotov27, G. Feldman16, R. J. Feuerbach6, T. A. Forest31, V. Frolov33, H. Funsten41, S. J. Gaff11, M. Garçon8, G. Gavalian31,42,§, G. P. Gilfoyle35, K. L. Giovanetti23, P. Girard36, F. X. Girod8, J. T. Goetz4, A. Gonenc14, R. W. Gothe36, K. A. Griffioen41, M. Guidal21, M. Guillo36, N. Guler31, L. Guo37, V. Gyurjyan37, K. Hafidi2, H. Hakobyan42, R. S. Hakobyan7, J. Hardie9,37, D. Heddle9,37, F. W. Hersman28, K. Hicks30, I. Hleiqawi30, M. Holtrop28, J. Hu33, C. E. Hyde-Wright31, Y. Ilieva16, D. G. Ireland17, B. S. Ishkhanov27, E. L. Isupov27, M. M. Ito37, D. Jenkins39, H. S. Jo21, K. Joo10,40, H. G. Juengst31, N. Kalantarians31, J. H. Kelley11, J. D. Kellie17, M. Khandaker29, K. Kim24, W. Kim24, A. Klein31, F. J. Klein7,37, M. Klusman33, M. Kossov22, L. H. Kramer14,37, V. Kubarovsky33, J. Kuhn6, S. E. Kuhn31, S. V. Kuleshov22, J. Lachniet31, J. M. Laget8,37, J. Langheinrich36, D. Lawrence26, K. Livingston17, H. Y. Lu36, K. Lukashin37,**, M. MacCormick21, J. J. Manak37, N. Markov10, S. McAleer15, B. McKinnon17, J. W. C. McNabb6, B. A. Mecking37, M. D. Mestayer37, C. A. Meyer6, T. Mibe30, K. Mikhailov22, R. Minehart40, M. Mirazita19, R. Miskimen26, V. Mokeev27,37, K. Moriya6, S. A. Morrow8,21, M. Moteabbed14, V. Muccifora19, G. S. Mutchler34, P. Nadel-Turonski16, J. Napolitano33, R. Nasseripour36, S. O. Nelson11, S. Niccolai21, G. Niculescu23,30, I. Niculescu16,23, B. B. Niczyporuk37, M. R. Niroula31, R. A. Niyazov31,37, M. Nozar37, G. V. O'Rielly16, M. Osipenko20,27, A. I. Ostrovidov15, K. Park24, E. Pasyuk3, C. Paterson17, G. Peterson26, S. A. Philips16, J. Pierce40, N. Pivnyuk22, D. Pocanic40, O. Pogorelko22, E. Polli19, S. Pozdniakov22, B. M. Preedom36, J. W. Price5, Y. Prok40,††, D. Protopopescu17, L. M. Qin31, B. A. Raue14,37, G. Riccardi15, G. Ricco20, M. Ripani20, B. G. Ritchie3, F. Ronchetti19, G. Rosner17, P. Rossi19, D. Rowntree25, P. D. Rubin35, F. Sabatié8,31, K. Sabourov11, J. Salamanca18, C. Salgado29, J. P. Santoro37,39,**, V. Sapunenko20,37, R. A. Schumacher6, V. S. Serov22, A. Shafi16, Y. G. Sharabian37,42, J. Shaw26, N. V. Shvedunov27, S. Simionatto16,‡‡, A. V. Skabelin25, E. S. Smith37, L. C. Smith40, D. I. Sober7, D. Sokhan12, M. Spraker11, A. Stavinsky22, S. S. Stepanyan24, S. Stepanyan37,42, B. E. Stokes15, P. Stoler33, I. I. Strakovsky16, S. Strauch36, M. Taiuti20, S. Taylor34, D. J. Tedeschi36, U. Thoma37,a, R. Thompson32, A. Tkabladze16,*, S. Tkachenko31, C. Tur36, M. Ungaro10, M. F. Vineyard35,38, A. V. Vlassov22, K. Wang40, D. P. Watts17,b, L. B. Weinstein31, H. Weller11, D. P. Weygand37, M. Williams6, E. Wolin37, M. H. Wood36,c, A. Yegneswaran37, J. Yun31, L. Zana28, J. Zhang31, B. Zhao10, and Z. W. Zhao36 (CLAS Collaboration)
1Abant Izzet Baysal University, Bolu 14280, Turkey 2Argonne National Laboratory, Argonne, Illinois 60439, USA 3Arizona State University, Tempe, Arizona 85287-1504, USA 4University of California at Los Angeles, Los Angeles, California 90095-1547, USA 5California State University, Dominguez Hills, Carson, California 90747, USA 6Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA 7Catholic University of America, Washington, DC 20064, USA 8CEA-Saclay, Service de Physique Nucléaire, F-91191 Gif-sur-Yvette, France 9Christopher Newport University, Newport News, Virginia 23606, USA 10University of Connecticut, Storrs, Connecticut 06269, USA 11Duke University, Durham, North Carolina 27708-0305, USA 12Edinburgh University, Edinburgh EH9 3JZ, United Kingdom 13Fairfield University, Fairfield, Connecticut 06824, USA 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 18Idaho State University, Pocatello, Idaho 83209, USA 19INFN, Laboratori Nazionali di Frascati, I-00044 Frascati, Italy 20INFN, Sezione di Genova, I-16146 Genova, Italy 21Institut de Physique Nucleaire ORSAY, Orsay, France 22Institute of Theoretical and Experimental Physics, Moscow, 117259, Russia 23James Madison University, Harrisonburg, Virginia 22807, USA 24Kyungpook 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, Skobeltsyn Nuclear Physics Institute, 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 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 37Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA 38Union College, Schenectady, New York 12308, USA 39Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0435, USA 40University of Virginia, Charlottesville, Virginia 22901, USA 41College of William and Mary, Williamsburg, Virginia 23187-8795, USA 42Yerevan Physics Institute, 375036 Yerevan, Armenia
Received 20 April 2007; published 27 July 2007
New cross sections for the reaction ep→e'ηp are reported for total center-of-mass energy W=1.5-2.3 GeV and invariant squared momentum transfer Q2=0.13-3.3 GeV2. This large kinematic range allows the extraction of new information about response functions, photocouplings, and ηN coupling strengths of baryon resonances. A sharp structure is seen at W~1.7 GeV. The shape of the differential cross section is indicative of the presence of a P-wave resonance that persists to high Q2. Improved values are derived for the photocoupling amplitude for the S11(1535) resonance. The new data greatly expand the Q2 range covered, and an interpretation of all data with a consistent parametrization is provided.
© 2007 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevC.76.015204
DOI:
10.1103/PhysRevC.76.015204
PACS:
14.20.Gk, 13.30.Eg, 13.60.Le, 25.30.Rw
*Current address: Ohio University, Athens, Ohio 45701, USA. †Current address: Systems Planning and Analysis, Alexandria, Virginia 22311, USA. ‡Deceased. §Current address: University of New Hampshire, Durham, New Hampshire 03824-3568, USA. **Current address: Catholic University of America, Washington, D.C. 20064, USA. ††Current address: Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA. ‡‡Current address: San Paulo University, Brazil. aCurrent address: Physikalisches Institut der Universitaet Giessen, D-35392 Giessen, Germany. bCurrent address: Edinburgh University, Edinburgh EH9 3JZ, United Kingdom. cCurrent address: University of Massachusetts, Amherst, Massachusetts 01003, USA.
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