Phys. Rev. C
77,
065208
(2008)
[15 pages]
Polarized structure function σLT' for 1H(e⃗,e'K+)Λ in the nucleon resonance region
R. Nasseripour et al. CLAS Collaboration
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R. Nasseripour1,2, B. A. Raue1, D. S. Carman3, P. Ambrozewicz1, M. J. Amaryan32, E. Anciant10, M. Anghinolfi21, B. Asavapibhop27, G. Asryan41, G. Audit10, T. Auger10, H. Avakian3, H. Bagdasaryan32, N. Baillie40, J. P. Ball5, N. A. Baltzell2, S. Barrow15, M. Battaglieri21, K. Beard24, I. Bedlinskiy23, M. Bektasoglu32, M. Bellis8, N. Benmouna17, B. L. Berman17, A. S. Biselli14, L. Blaszczyk15, B. E. Bonner35, S. Bouchigny3,22, S. Boiarinov3, R. Bradford8, D. Branford13, W. J. Briscoe17, W. K. Brooks3, V. D. Burkert3, C. Butuceanu40, J. R. Calarco29, S. L. Careccia32, L. Casey9, C. Cetina17, S. Chen15, L. Cheng9, P. L. Cole19, P. Collins5, P. Coltharp15, D. Cords3,*, P. Corvisiero21, D. Crabb39, V. Crede15, D. Dale19, N. Dashyan41, R. De Masi10, R. De Vita21, E. De Sanctis20, P. V. Degtyarenko3, L. Dennis15, A. Deur3, K. S. Dhuga17, R. Dickson8, C. Djalali2, G. E. Dodge32, D. Doughty3,11, P. Dragovitsch15, M. Dugger5, S. Dytman33, O. P. Dzyubak2, H. Egiyan29, K. S. Egiyan41,*, L. El Fassi4, L. Elouadrhiri3,11, P. Eugenio15, R. Fatemi39, G. Fedotov28, G. Feldman17, R. J. Feuerbach8, T. A. Forest19, A. Fradi22, H. Funsten40,*, M. Garçcon10, G. Gavalian29,32, N. Gevorgyan41, G. P. Gilfoyle36, K. L. Giovanetti24, P. Girard2, F. X. Girod10, J. T. Goetz6, R. W. Gothe2, K. A. Griffioen40, M. Guidal22, M. Guillo2, N. Guler32, L. Guo3, V. Gyurjyan3, K. Hafidi4, H. Hakobyan41, C. Hanretty15, J. Hardie3,11, D. Heddle3,11, F. W. Hersman29, K. Hicks31, I. Hleiqawi31, M. Holtrop29, J. Hu34, C. E. Hyde-Wright32, Y. Ilieva17, D. G. Ireland18, B. S. Ishkhanov28, E. L. Isupov28, M. M. Ito3, D. Jenkins38, H. S. Jo22, J. R. Johnstone18, K. Joo12,39, H. G. Juengst32, N. Kalantarians32, J. D. Kellie18, M. Khandaker30, K. Y. Kim33, K. Kim25, W. Kim25, A. Klein32, F. J. Klein9, M. Kossov23, Z. Krahn8, L. H. Kramer1,3, V. Kubarovsky3,34, J. Kuhn8, S. E. Kuhn32, S. V. Kuleshov23, V. Kuznetsov25, J. Lachniet32, J. M. Laget3,10, J. Langheinrich2, D. Lawrence3, K. Livingston18, H. Y. Lu2, K. Lukashin9, M. MacCormick22, J. J. Manak3, N. Markov12, P. Mattione35, S. McAleer15, B. McKinnon18, J. W. C. McNabb8, B. A. Mecking3, M. D. Mestayer3, C. A. Meyer8, T. Mibe31, K. Mikhailov23, R. Minehart39, M. Mirazita20, R. Miskimen27, V. Mokeev3,28, B. Moreno22, K. Moriya8, S. A. Morrow10,22, M. Moteabbed1, J. Mueller33, E. Munevar17, G. S. Mutchler35, P. Nadel-Turonski17, S. Niccolai22, G. Niculescu24, I. Niculescu24, B. B. Niczyporuk3, M. R. Niroula32, R. A. Niyazov3,32, M. Nozar3, M. Osipenko21,28, A. I. Ostrovidov15, K. Park2, E. Pasyuk5, C. Paterson18, S. Anefalos Pereira20, G. Peterson27, S. A. Philips17, J. Pierce39, N. Pivnyuk23, D. Pocanic39, O. Pogorelko23, S. Pozdniakov23, B. M. Preedom2, J. W. Price7, S. Procureur10, Y. Prok11, D. Protopopescu18, L. M. Qin32, G. Riccardi15, G. Ricco21, M. Ripani21, B. G. Ritchie5, G. Rosner18, P. Rossi20, P. D. Rubin36, F. Sabatié10,32, J. Salamanca19, C. Salgado30, J. P. Santoro9, V. Sapunenko3,21, D. Sayre31, R. A. Schumacher8, V. S. Serov23, A. Shafi17, Y. G. Sharabian3, D. Sharov28, N. V. Shvedunov28, S. Simionatto17, A. V. Skabelin26, E. S. Smith3, L. C. Smith39, D. I. Sober9, D. Sokhan13, A. Stavinsky23, S. S. Stepanyan25, S. Stepanyan3, B. E. Stokes15, P. Stoler34, I. I. Strakovsky17, S. Strauch2, M. Taiuti21, S. Taylor3, D. J. Tedeschi2, R. Thompson33, A. Tkabladze17, S. Tkachenko32, M. Ungaro12, M. F. Vineyard37, A. V. Vlassov23, K. Wang39, D. P. Watts18, L. B. Weinstein32, D. P. Weygand3, M. Williams8, E. Wolin3, M. H. Wood2, A. Yegneswaran3, J. Yun32, L. Zana29, J. Zhang32, B. Zhao12, and Z. W. Zhao2 (CLAS Collaboration)
1Florida International University, Miami, Florida 33199, USA
2University of South Carolina, Columbia, South Carolina 29208, USA
3Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
4Argonne National Laboratory, Argonne, Illinois 60439, USA
5Arizona State University, Tempe, Arizona 85287-1504, USA
6University of California at Los Angeles, Los Angeles, California 90095-1547, USA
7California State University Dominguez Hills, Carson, California 90747, USA
8Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
9Catholic University of America, Washington, DC 20064, USA
10CEA-Saclay, Service de Physique Nucléaire, F-91191 Gif-sur-Yvette, France
11Christopher Newport University, Newport News, Virginia 23606, USA
12University of Connecticut, Storrs, Connecticut 06269, USA
13Edinburgh University, Edinburgh EH9 3JZ, United Kingdom
14Fairfield University, Fairfield, Connecticut 06824, USA
15Florida State University, Tallahassee, Florida 32306, USA
16Physikalisches Institut der Universitaet Giessen, D-35392 Giessen, Germany
17George Washington University, Washington, DC 20052, USA
18University of Glasgow, Glasgow G12 8QQ, United Kingdom
19Idaho State University, Pocatello, Idaho 83209, USA
20INFN, Laboratori Nazionali di Frascati, I-00044 Frascati, Italy
21INFN, Sezione di Genova, I-16146 Genova, Italy
22Institut de Physique Nucleaire ORSAY, Orsay, France
23Institute of Theoretical and Experimental Physics, RU-117259 Moscow, Russia
24James Madison University, Harrisonburg, Virginia 22807, USA
25Kyungpook National University, Daegu 702-701, Republic of Korea
26Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA
27University of Massachusetts, Amherst, Massachusetts 01003, USA
28Moscow State University, General Nuclear Physics Institute, RU-119899 Moscow, Russia
29University of New Hampshire, Durham, New Hampshire 03824-3568, USA
30Norfolk State University, Norfolk, Virginia 23504, USA
31Ohio University, Athens, Ohio 45701, USA
32Old Dominion University, Norfolk, Virginia 23529, USA
33University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
34Rensselaer Polytechnic Institute, Troy, New York 12180-3590, USA
35Rice University, Houston, Texas 77005-1892, USA
36University of Richmond, Richmond, Virginia 23173, USA
37Union College, Schenectady, New York 12308, USA
38Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0435, USA
39University of Virginia, Charlottesville, Virginia 22901, USA
40College of William and Mary, Williamsburg, Virginia 23187-8795, USA
41Yerevan Physics Institute, 375036 Yerevan, Armenia
Received 1 February 2008; published 11 June 2008
The first measurements of the polarized structure function σLT' for the reaction 1H(e⃗,e'K+)Λ in the nucleon resonance region are reported. Measurements are included from threshold up to W=2.05 GeV for central values of Q2 of 0.65 and 1.00 GeV2, and nearly the entire kaon center-of-mass angular range. σLT' is the imaginary part of the longitudinal-transverse response and is expected to be sensitive to interferences between competing intermediate s-channel resonances, as well as resonant and nonresonant processes. The results for σLT' are comparable in magnitude to previously reported results from CLAS for σLT, the real part of the same response. An intriguing sign change in σLT' is observed in the high Q2 data at W≈1.9 GeV. Comparisons to several existing model predictions are shown.
© 2008 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevC.77.065208
DOI:
10.1103/PhysRevC.77.065208
PACS:
13.40.-f, 13.60.Rj, 13.88.+e, 14.20.Jn
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