Phys. Rev. C
73,
035202
(2006)
[36 pages]
Differential cross sections for γ+p→K++Y for Λ and Σ0 hyperons
R. Bradford et al. CLAS Collaboration
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R. Bradford1,*, R. A. Schumacher1, J. W. C. McNabb1, L. Todor1, G. Adams29, P. Ambrozewicz10, E. Anciant5, M. Anghinolfi16, B. Asavapibhop22, G. Asryan38, G. Audit5, H. Avakian15,33, H. Bagdasaryan27, N. Baillie37, J. P. Ball2, N. A. Baltzell32, S. Barrow11, V. Batourine20, M. Battaglieri16, K. Beard19, I. Bedlinskiy18, M. Bektasoglu27,†, M. Bellis1, N. Benmouna12, B. L. Berman12, N. Bianchi15, A. S. Biselli1,29, B. E. Bonner30, S. Bouchigny17,33, S. Boiarinov18,33, D. Branford9, W. J. Briscoe12, W. K. Brooks33, S. Bültmann27, V. D. Burkert33, C. Butuceanu37, J. R. Calarco24, S. L. Careccia27, D. S. Carman26, B. Carnahan4, S. Chen11, P. L. Cole14,33, A. Coleman37, P. Coltharp11, P. Corvisiero16, D. Crabb36, H. Crannell4, J. P. Cummings29, R. DeVita16, E. De Sanctis15, P. V. Degtyarenko33, H. Denizli28, L. Dennis11, A. Deur33, K. V. Dharmawardane27, K. S. Dhuga12, C. Djalali32, G. E. Dodge27, J. Donnelly13, D. Doughty6,33, P. Dragovitsch11, M. Dugger2, S. Dytman28, O. P. Dzyubak32, H. Egiyan33,37, K. S. Egiyan38, L. Elouadrhiri6,33, A. Empl29, P. Eugenio11, R. Fatemi36, G. Fedotov23, G. Feldman12, R. J. Feuerbach1, T. A. Forest27, H. Funsten37, M. Garçon5, G. Gavalian27,38, G. P. Gilfoyle31, K. L. Giovanetti19, F. X. Girod5, J. T. Goetz3, E. Golovatch16, A. Gonenc10, R. W. Gothe32, K. A. Griffioen37, M. Guidal17, M. Guillo32, N. Guler27, L. Guo33, V. Gyurjyan33, C. Hadjidakis17, R. S. Hakobyan4, J. Hardie6,33, D. Heddle6,33, F. W. Hersman24, K. Hicks26, I. Hleiqawi26, M. Holtrop24, J. Hu29, M. Huertas32, C. E. Hyde-Wright27, Y. Ilieva12, D. G. Ireland13, B. S. Ishkhanov23, M. M. Ito33, D. Jenkins35, H. S. Jo17, K. Joo7,36, H. G. Juengst27, J. D. Kellie13, M. Khandaker25, K. Y. Kim28, K. Kim20, W. Kim20, A. Klein27, F. J. Klein4,33, A. V. Klimenko27, M. Klusman29, M. Kossov18, L. H. Kramer10,33, V. Kubarovsky29, J. Kuhn1, S. E. Kuhn27, S. V. Kuleshov18, J. Lachniet1, J. M. Laget5,33, J. Langheinrich32, D. Lawrence22, A. C. S. Lima12, K. Livingston13, K. Lukashin33, J. J. Manak33, C. Marchand5, S. McAleer11, B. McKinnon13, B. A. Mecking33, M. D. Mestayer33, C. A. Meyer1, T. Mibe26, K. Mikhailov18, R. Minehart36, M. Mirazita15, R. Miskimen22, V. Mokeev23, S. A. Morrow5,17, V. Muccifora15, J. Mueller28, G. S. Mutchler30, P. Nadel-Turonski12, J. Napolitano29, R. Nasseripour32, S. Niccolai12,17, G. Niculescu19,26, I. Niculescu12,19, B. B. Niczyporuk33, R. A. Niyazov27,33, M. Nozar33, G. V. O'Rielly12, M. Osipenko16,23, A. I. Ostrovidov11, K. Park20, E. Pasyuk2, C. Paterson13, S. A. Philips12, J. Pierce36, N. Pivnyuk18, D. Pocanic36, O. Pogorelko18, E. Polli15, I. Popa12, S. Pozdniakov18, B. M. Preedom32, J. W. Price3, Y. Prok36, D. Protopopescu13, L. M. Qin27, B. P. Quinn1, B. A. Raue10,33, G. Riccardi11, G. Ricco16, M. Ripani16, B. G. Ritchie2, F. Ronchetti15, G. Rosner13, P. Rossi15, D. Rowntree21, P. D. Rubin31, F. Sabatié5,27, C. Salgado25, J. P. Santoro33,35, V. Sapunenko16,33, V. S. Serov18, A. Shafi12, Y. G. Sharabian33,38, J. Shaw22, S. Simionatto12, A. V. Skabelin21, E. S. Smith33, L. C. Smith36, D. I. Sober4, M. Spraker8, A. Stavinsky18, S. S. Stepanyan20, S. Stepanyan33,38, B. E. Stokes11, P. Stoler29, I. I. Strakovsky12, S. Strauch12, R. Suleiman21, M. Taiuti16, S. Taylor30, D. J. Tedeschi32, U. Thoma33, R. Thompson28, A. Tkabladze26, S. Tkachenko27, C. Tur32, M. Ungaro7,29, M. F. Vineyard31,34, A. V. Vlassov18, K. Wang36, L. B. Weinstein27, H. Weller8, D. P. Weygand33, M. Williams1, E. Wolin33, M. H. Wood32, A. Yegneswaran33, J. Yun27, L. Zana24, J. Zhang27, and B. Zhao7 (CLAS Collaboration)
1Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
2Arizona State University, Tempe, Arizona 85287-1504, USA
3University of California at Los Angeles, Los Angeles, California 90095-1547, USA
4Catholic University of America, Washington, DC 20064, USA
5CEA-Saclay, Service de Physique Nucléaire, F-91191 Gif-sur-Yvette, Cedex, France
6Christopher Newport University, Newport News, Virginia 23606, USA
7University of Connecticut, Storrs, Connecticut 06269, USA
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
14Idaho State University, Pocatello, Idaho 83209, USA
15INFN, Laboratori Nazionali di Frascati, Frascati, Italy
16INFN, Sezione di Genova, I-16146 Genova, Italy
17Institut de Physique Nucleaire ORSAY, Orsay, France
18Institute of Theoretical and Experimental Physics, Moscow, RU-117259, Russia
19James Madison University, Harrisonburg, Virginia 22807, USA
20Kyungpook National University, Daegu 702-701, South Korea
21Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA
22University of Massachusetts, Amherst, Massachusetts 01003, USA
23Moscow State University, General Nuclear Physics Institute, RU-119899 Moscow, Russia
24University of New Hampshire, Durham, New Hampshire 03824-3568, USA
25Norfolk State University, Norfolk, Virginia 23504, USA
26Ohio University, Athens, Ohio 45701, USA
27Old Dominion University, Norfolk, Virginia 23529, USA
28University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
29Rensselaer Polytechnic Institute, Troy, New York 12180-3590, USA
30Rice University, Houston, Texas 77005-1892, USA
31University of Richmond, Richmond, Virginia 23173, USA
32University of South Carolina, Columbia, South Carolina 29208, USA
33Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
34Union College, Schenectady, New York 12308, USA
35Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0435, USA
36University of Virginia, Charlottesville, Virginia 22901, USA
37College of William and Mary, Williamsburg, Virginia 23187-8795, USA
38Yerevan Physics Institute, 375036 Yerevan, Armenia
Received 24 September 2005; published 7 March 2006
High-statistics cross sections for the reactions γ+p→K++Λ and γ+p→K++Σ0 have been measured using CLAS at Jefferson Lab for center-of-mass energies W between 1.6 and 2.53 GeV, and for -0.85<cosθK+c.m.<+0.95. In the K+Λ channel we confirm a resonance-like structure near W=1.9 GeV at backward kaon angles. The position and width of this structure change with angle, indicating that more than one resonance is likely playing a role. The K+Λ channel at forward angles and all energies is well described by a t-channel scaling characteristic of Regge exchange, whereas the same scaling applied to the K+Σ0 channel is less successful. Several existing theoretical models are compared to the data, but none provide a good representation of the results.
© 2006 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevC.73.035202
DOI:
10.1103/PhysRevC.73.035202
PACS:
25.20.Lj, 13.40.-f, 13.60.Le, 14.20.Gk
*Current address: University of Rochester, New York 14627, USA. †Current address: University of Sakarya, Turkey.
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