Phys. Rev. C
69,
042201(R)
(2004)
[5 pages]
Hyperon photoproduction in the nucleon resonance region
J. W. C. McNabb et al. CLAS Collaboration
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J. W. C. McNabb1,27, R. A. Schumacher1, L. Todor1, G. Adams30, E. Anciant3, M. Anghinolfi15, B. Asavapibhop21, G. Audit3, T. Auger3, H. Avakian35,14, H. Bagdasaryan40, J. P. Ball2, S. Barrow11, M. Battaglieri15, K. Beard18, M. Bektasoglu25, M. Bellis30, B. L. Berman12, N. Bianchi14, A. S. Biselli30, S. Boiarinov35, B. E. Bonner31, S. Bouchigny16, R. Bradford1, D. Branford9, W. J. Briscoe12, W. K. Brooks35, V. D. Burkert35, C. Butuceanu39, J. R. Calarco23, D. S. Carman25, B. Carnahan5, C. Cetina12, L. Ciciani26, P. L. Cole34, A. Coleman39, A. D. Cords35, P. Corvisiero15, D. Crabb38, H. Crannell5, J. P. Cummings30, E. De Sanctis14, R. DeVita15, P. V. Degtyarenko35, H. Denizli28, L. Dennis11, K. V Dharmawardane26, K. S. Dhuga12, C. Djalali33, G. E. Dodge26, D. Doughty6, P. Dragovitsch11, M. Dugger2, S. Dytman28, M. Eckhause39, H. Egiyan35, K. S. Egiyan40, L. Elouadrhiri35, A. Empl30, P. Eugenio11, R. Fatemi38, R. J. Feuerbach1, J. Ficenec37, T. A. Forest26, H. Funsten39, S. J. Gaff8, G. Gavalian23, S. Gilad20, G. P. Gilfoyle32, K. L. Giovanetti18, P. Girard33, C. I. O. Gordon13, K. Griffioen39, M. Guidal16, M. Guillo33, L. Guo35, V. Gyurjyan35, C. Hadjidakis16, R. Hakobyan5, J. Hardie6, D. Heddle6, P. Heimberg12, F. W. Hersman23, K. Hicks25, R. S. Hicks21, M. Holtrop23, J. Hu30, C. E. Hyde-Wright26, Y. Ilieva12, M. M. Ito35, D. Jenkins37, K. Joo35, J. H. Kelley8, M. Khandaker24, K. Y. Kim28, K. Kim19, W. Kim19, A. Klein5, F. J. Klein35, A. V. Klimenko26, M. Klusman30, M. Kossov17, L. H. Kramer10, Y. Kuang39, S. E. Kuhn26, J. Lachniet1, J. M. Laget3, D. Lawrence21, Ji Li30, K. Lukashin35, J. J. Manak35, C. Marchand3, S. McAleer11, J. McCarthy38, B. A. Mecking35, S. Mehrabyan28, J. J. Melone13, M. D. Mestayer35, C. A. Meyer1, K. Mikhailov17, R. Minehart38, M. Mirazita14, R. Miskimen21, L. Morand3, S. A. Morrow16, V. Muccifora14, J. Mueller28, G. S. Mutchler31, J. Napolitano30, R. Nasseripour10, S. O. Nelson8, S. Niccolai12, G. Niculescu25, I. Niculescu18, B. B. Niczyporuk35, R. A. Niyazov26, M. Nozar35, J. T. O’Brien5, G. V. O’Rielly12, M. Osipenko15,22, K. Park19, E. Pasyuk2, G. Peterson21, S. A. Philips12, N. Pivnyuk17, D. Pocanic38, O. Pogorelko17, E. Polli14, S. Pozdniakov17, B. M. Preedom33, J. W. Price4, Y. Prok38, D. Protopopescu23, L. M. Qin26, B. P. Quinn1, B. A. Raue10, G. Riccardi11, G. Ricco15, M. Ripani15, B. G. Ritchie2, F. Ronchetti14, P. Rossi14, D. Rowntree20, P. D. Rubin32, F. Sabatié3, K. Sabourov8, C. Salgado24, J. P. Santoro37, V. Sapunenko15, V. S. Serov17, A. Shafi12, Y. G. Sharabian35, J. Shaw21, S. Simionatto12, A. V. Skabelin20, E. S. Smith35, L. C. Smith38, D. I. Sober5, M. Spraker8, A. Stavinsky17, S. Stepanyan40, P. Stoler30, I. I. Strakovsky12, S. Strauch12, M. Taiuti15, S. Taylor20, D. J. Tedeschi33, U. Thoma35, R. Thompson28, C. Tur33, M. Ungaro30, M. F. Vineyard36, A. V. Vlassov17, K. Wang38, L. B. Weinstein26, A. Weisberg25, H. Weller8, D. P. Weygand35, C. S. Whisnant33, E. Wolin35, M. H. Wood33, A. Yegneswaran35, J. Yun26, B. Zhang20, J. Zhao20, and Z. Zhou20 (CLAS Collaboration)
1Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
2Arizona State University, Tempe, Arizona 85287-1504, USA
3CEA-Saclay, Service de Physique Nucléaire, F91191 Gif-sur-Yvette, Cedex, France
4University of California at Los Angeles, Los Angeles, California 90095-1547, USA
5Catholic University of America, Washington, D.C. 20064, USA
6Christopher Newport University, Newport News, Virginia 23606, USA
7University of Connecticut, Storrs, Connecticut 06269,
8Duke University, Durham, North Carolina 27708-0305, USA
9Edinburgh University, Edinburgh EH9 3JZ, United Kingdom
10Florida International University, Miami, Florida 33199, USA
11Florida State University, Tallahassee, Florida 32306, USA
12The George Washington University, Washington, DC 20052, USA
13University of Glasgow, Glasgow G12 8QQ, United Kingdom
14INFN, Laboratori Nazionali di Frascati, Frascati, Italy
15INFN, Sezione di Genova, 16146 Genova, Italy
16Institut de Physique Nucleaire ORSAY, Orsay, France
17Institute of Theoretical and Experimental Physics, Moscow 117259, Russia
18James Madison University, Harrisonburg, Virginia 22807, USA
19Kyungpook National University, Daegu 702-701, South Korea
20Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA
21University of Massachusetts, Amherst, Massachusetts 01003, USA
22Moscow State University, 119899 Moscow, Russia
23University of New Hampshire, Durham, New Hampshire 03824-3568, USA
24Norfolk State University, Norfolk, Virginia 23504, USA
25Ohio University, Athens, Ohio 45701, USA
26Old Dominion University, Norfolk, Virginia 23529, USA
27Penn State University, University Park, Pennsylvania 16802, USA
28University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
29Universita’ di ROMA III, 00146 Roma, Italy
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
34University of Texas at El Paso, El Paso, Texas 79968, USA
35Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
36Union College, Schenectady, New York 12308, USA
37Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0435, USA
38University of Virginia, Charlottesville, Virginia 22901, USA
39College of Willliam and Mary, Williamsburg, Virginia 23187-8795, USA
40Yerevan Physics Institute, 375036 Yerevan, Armenia
Received 25 May 2003; published 5 April 2004
High-statistics cross sections and recoil polarizations for the reactions γ+p→K++Λ and γ+p→K++Σ0 have been measured at CLAS for center-of-mass energies between 1.6 and 2.3 GeV. In the K+Λ channel we confirm a resonance-like structure near W=1.9 GeV at backward kaon angles. Our data show more complex s- and u- channel behavior than previously seen, since structure is also present at forward angles, but not at central angles. The position and width change with angle, indicating that more than one resonance is playing a role. Large positive Λ polarization at backward angles, which is also energy dependent, is consistent with sizable s- or u-channel contributions. Presently available model calculations cannot explain these aspects of the data.
© 2004 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevC.69.042201
DOI:
10.1103/PhysRevC.69.042201
PACS:
13.60.Le, 13.30.Eg, 14.20.Gk, 25.20.Lj
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