Phys. Rev. C
75,
045203
(2007)
[26 pages]
Separated structure functions for the exclusive electroproduction of K+Λ and K+Σ0 final states
P. Ambrozewicz et al. CLAS Collaboration
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P. Ambrozewicz1, D. S. Carman2,3, R. J. Feuerbach2, M. D. Mestayer2, B. A. Raue1,2, R. A. Schumacher4, A. Tkabladze5, M. J. Amarian6, M. Anghinolfi7, B. Asavapibhop8, G. Asryan9, H. Avakian2, H. Bagdasaryan6, N. Baillie10, J. P. Ball11, N. A. Baltzell12, S. Barrow13, V. Batourine14, M. Battaglieri7, K. Beard15, I. Bedlinskiy16, M. Bektasoglu6, M. Bellis4, N. Benmouna5, B. L. Berman5, N. Bianchi17, A. S. Biselli18, B. E. Bonner19, S. Bouchigny2,20, S. Boiarinov2, R. Bradford4, D. Branford21, W. J. Briscoe5, W. K. Brooks2, S. Bültmann6, V. D. Burkert2, C. Butuceanu10, J. R. Calarco22, S. L. Careccia6, C. Cetina5, S. Chen13, P. L. Cole23, P. Collins11, P. Coltharp13, D. Cords2, P. Corvisiero7, D. Crabb24, V. Crede13, J. P. Cummings25, N. Dashyan9, R. De Masi26, R. De Vita7, E. De Sanctis17, P. V. Degtyarenko2, L. Dennis13, A. Deur2, K. S. Dhuga5, R. Dickson4, C. Djalali12, G. E. Dodge6, J. Donnelly27, D. Doughty28,2, P. Dragovitsch13, M. Dugger11, S. Dytman29, O. P. Dzyubak12, H. Egiyan22, K. S. Egiyan9, L. El Fassi30, L. Elouadrhiri2, A. Empl25, P. Eugenio13, L. Farhi26, R. Fatemi24, G. Fedotov31, G. Feldman5, T. A. Forest6, V. Frolov25, H. Funsten10, M. Garçon26, G. Gavalian6, G. P. Gilfoyle32, K. L. Giovanetti15, P. Girard12, F. X. Girod26, J. T. Goetz33, A. Gonenc1, R. W. Gothe12, K. A. Griffioen10, M. Guidal20, M. Guillo12, N. Guler6, L. Guo2, V. Gyurjyan2, K. Hafidi30, H. Hakobyan9, J. Hardie28,2, D. Heddle28,2, F. W. Hersman22, K. Hicks3, I. Hleiqawi3, M. Holtrop22, J. Hu25, C. E. Hyde-Wright6, Y. Ilieva5, D. G. Ireland27, B. S. Ishkhanov31, E. L. Isupov31, M. M. Ito2, D. Jenkins34, H. S. Jo20, K. Joo35, H. G. Juengst6, N. Kalantarians6, J. D. Kellie27, M. Khandaker36, K. Y. Kim29, K. Kim14, W. Kim14, A. Klein6, F. J. Klein37, M. Klusman25, M. Kossov16, L. H. Kramer1,2, V. Kubarovsky25, J. Kuhn4, S. E. Kuhn6, S. V. Kuleshov16, J. Lachniet6, J. M. Laget26,2, J. Langheinrich12, D. Lawrence2, K. Livingston27, H. Y. Lu12, K. Lukashin37, M. MacCormick20, J. J. Manak2, N. Markov35, S. McAleer13, B. McKinnon27, J. W. C. McNabb4, B. A. Mecking2, C. A. Meyer4, T. Mibe3, K. Mikhailov16, R. Minehart24, M. Mirazita17, R. Miskimen8, V. Mokeev31, K. Moriya4, S. A. Morrow26,20, M. Moteabbed1, V. Muccifora17, J. Mueller29, G. S. Mutchler19, P. Nadel-Turonski5, J. Napolitano25, R. Nasseripour12, S. Niccolai20, G. Niculescu15, I. Niculescu15, B. B. Niczyporuk2, M. R. Niroula6, R. A. Niyazov6,2, M. Nozar2, G. V. O'Rielly5, M. Osipenko7,31, A. I. Ostrovidov13, K. Park14, E. Pasyuk11, C. Paterson27, S. A. Philips5, J. Pierce24, N. Pivnyuk16, D. Pocanic24, O. Pogorelko16, E. Polli17, S. Pozdniakov16, B. M. Preedom12, J. W. Price38, Y. Prok39, D. Protopopescu27, L. M. Qin6, G. Riccardi13, G. Ricco7, M. Ripani7, B. G. Ritchie11, F. Ronchetti17, G. Rosner27, P. Rossi17, D. Rowntree39, P. D. Rubin32, F. Sabatié6,26, J. Salamanca23, C. Salgado36, J. P. Santoro37, V. Sapunenko7,2, D. Sayre3, V. S. Serov16, A. Shafi5, Y. G. Sharabian2, N. V. Shvedunov31, S. Simionatto5, A. V. Skabelin39, E. S. Smith2, L. C. Smith24, D. I. Sober37, D. Sokhan21, A. Stavinsky16, S. S. Stepanyan14, S. Stepanyan2, B. E. Stokes13, P. Stoler25, I. I. Strakovsky5, S. Strauch12, M. Taiuti7, S. Taylor3, D. J. Tedeschi12, R. Thompson29, S. Tkachenko6, C. Tur12, M. Ungaro35, M. F. Vineyard40, A. V. Vlassov16, K. Wang24, D. P. Watts21, L. B. Weinstein6, D. P. Weygand2, M. Williams4, E. Wolin2, M. H. Wood12, A. Yegneswaran2, J. Yun6, L. Zana22, J. Zhang6, B. Zhao35, and Z. W. Zhao12 (CLAS Collaboration)
1Florida International University, Miami, Florida 33199, USA
2Thomas Jefferson National Accelerator Laboratory, Newport News, Virginia 23606, USA
3Ohio University, Athens, Ohio 45701, USA
4Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
5The George Washington University, Washington, D.C. 20052, USA
6Old Dominion University, Norfolk, Virginia 23529, USA
7INFN, Sezione di Genova and Dipartimento di Fisica, Università di Genova, I-16146 Genova, Italy
8University of Massachusetts, Amherst, Massachusetts 01003, USA
9Yerevan Physics Institute, 375036 Yerevan, Armenia
10College of William and Mary, Williamsburg, Virginia 23187, USA
11Arizona State University, Tempe, Arizona 85287, USA
12University of South Carolina, Columbia, South Carolina 29208, USA
13Florida State University, Tallahassee, Florida 32306, USA
14Kyungpook National University, Daegu 702-701, South Korea
15James Madison University, Harrisonburg, Virginia 22807, USA
16Institute of Theoretical and Experimental Physics, Moscow, 117259, Russia
17INFN, Laboratori Nazionali di Frascati, P.O. 13, I-00044 Frascati, Italy
18Fairfield University, Fairfield, Connecticut 06824, USA
19Rice University, Houston, Texas 77005, USA
20Institut de Physique Nucleaire d'ORSAY, IN2P3, BP1, F-91406 Orsay, France
21Edinburgh University, Edinburgh EH9 3JZ, United Kingdom
22University of New Hampshire, Durham, New Hampshire 03824, USA
23Idaho State University, Pocatello, Idaho 83209, USA
24University of Virginia, Charlottesville, Virginia 22901, USA
25Rensselaer Polytechnic Institute, Troy, New York 12180, USA
26CEA-Saclay, DAPNIA-SPhN, F-91191 Gif-sur-Yvette Cedex, France
27University of Glasgow, Glasgow G12 8QQ, United Kingdom
28Christopher Newport University, Newport News, Virginia 23606, USA
29University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
30Argonne National Laboratory, Argonne, Illinois 60439, USA
31Moscow State University, 119899 Moscow, Russia
32University of Richmond, Richmond, Virginia 23173, USA
33University of California at Los Angeles, Los Angeles, California 90095, USA
34Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA
35University of Connecticut, Storrs, Connecticut 06269, USA
36Norfolk State University, Norfolk, Virginia 23504, USA
37Catholic University of America, Washington, D.C. 20064, USA
38California State University, Dominguez Hills, Carson, California 90747, USA
39Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
40Union College, Schenectady, New York 12308, USA
Received 18 November 2006; published 9 April 2007
We report measurements of the exclusive electroproduction of K+Λ and K+Σ0 final states from a proton target using the Continuous Electron Beam Accelerator Facility (CEBAF) large-acceptance spectrometer (CLAS) detector at the Thomas Jefferson National Accelerator Facility. The separated structure functions σT,σL,σTT, and σLT were extracted from the Φ- and ε-dependent differential cross sections taken with electron beam energies of 2.567, 4.056, and 4.247 GeV. This analysis represents the first σL/σT separation with the CLAS detector, and the first measurement of the kaon electroproduction structure functions away from parallel kinematics. The data span a broad range of momentum transfers from 0.5⩽Q2⩽2.8GeV2 and invariant energy from 1.6⩽W⩽2.4 GeV, while spanning nearly the full center-of-mass angular range of the kaon. The separated structure functions reveal clear differences between the production dynamics for the Λ and Σ0 hyperons. These results provide an unprecedented data sample with which to constrain current and future models for the associated production of strangeness, which will allow for a better understanding of the underlying resonant and nonresonant contributions to hyperon production.
© 2007 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevC.75.045203
DOI:
10.1103/PhysRevC.75.045203
PACS:
13.40.-f, 13.60.Rj, 13.85.Fb, 14.20.Jn
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