Phys. Rev. Lett.
96,
042001
(2006)
[6 pages]
Search for Θ+(1540) Pentaquark in High-Statistics Measurement of γp→K̅ 0K+n at CLAS
M. Battaglieri et al. CLAS Collaboration
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M. Battaglieri1, R. De Vita1, V. Kubarovsky2, L. Guo3, G. S. Mutchler4, P. Stoler2, D. P. Weygand3, P. Ambrozewicz14, M. Anghinolfi1, G. Asryan38, H. Avakian3, H. Bagdasaryan31, N. Baillie37, J. P. Ball5, N. A. Baltzell33, V. Batourine25, I. Bedlinskiy22, M. Bellis2,8, N. Benmouna16, B. L. Berman16, A. S. Biselli8, S. Bouchigny20, S. Boiarinov3, R. Bradford8, D. Branford13, W. J. Briscoe16, W. K. Brooks3, S. Bültmann31, V. D. Burkert3, C. Butuceanu37, J. R. Calarco28, S. L. Careccia31, D. S. Carman30, S. Chen15, E. Clinton26, P. L. Cole18, P. Coltharp15, D. Crabb36, H. Crannell9, J. P. Cummings2, D. Dale39, E. De Sanctis19, P. V. Degtyarenko3, A. Deur3, K. V. Dharmawardane31, C. Djalali33, G. E. Dodge31, J. Donnelly17, D. Doughty11,3, M. Dugger5, O. P. Dzyubak33, H. Egiyan3,*, K. S. Egiyan38, L. Elouadrhiri3, P. Eugenio15, G. Fedotov27, H. Funsten37, M. Y. Gabrielyan39, L. Gan40, M. Garçon10, A. Gasparian41, G. Gavalian28,31, G. P. Gilfoyle32, K. L. Giovanetti23, F. X. Girod10, O. Glamazdin24, J. Goett2, J. T. Goetz6, E. Golovach27, A. Gonenc14, C. I. O. Gordon17, R. W. Gothe33, K. A. Griffioen37, M. Guidal20, N. Guler31, V. Gyurjyan3, C. Hadjidakis20, R. S. Hakobyan9, J. Hardie11,3, F. W. Hersman28, K. Hicks30, I. Hleiqawi30, M. Holtrop28, C. E. Hyde-Wright31, Y. Ilieva16, D. G. Ireland17, B. S. Ishkhanov27, M. M. Ito3, D. Jenkins35, H. S. Jo20, K. Joo12, H. G. Juengst16,†, J. D. Kellie17, M. Khandaker29, W. Kim25, A. Klein31, F. J. Klein9, A. V. Klimenko31, M. Kossov22, L. H. Kramer14,3, J. Kuhn8, S. E. Kuhn31, S. V. Kuleshov22, J. Lachniet8, J. M. Laget10,3, J. Langheinrich33, D. Lawrence26, T. Lee28, Ji Li2, K. Livingston17, B. McKinnon17, B. A. Mecking3, J. J. Melone17, M. D. Mestayer3, C. A. Meyer8, T. Mibe30, K. Mikhailov22, R. Minehart36, M. Mirazita19, R. Miskimen26, V. Mochalov21, V. Mokeev27, L. Morand10, S. A. Morrow20,10, P. Nadel-Turonski16, I. Nakagawa42, R. Nasseripour14,33, S. Niccolai20, G. Niculescu23, I. Niculescu23, B. B. Niczyporuk3, R. A. Niyazov3, M. Nozar3, M. Osipenko1,27, A. I. Ostrovidov15, K. Park25, E. Pasyuk5, C. Paterson17, J. Pierce36, N. Pivnyuk22, D. Pocanic36, O. Pogorelko22, S. Pozdniakov22, J. W. Price6,7, Y. Prok36,‡, D. Protopopescu17, B. A. Raue14,3, G. Riccardi15, G. Ricco1, M. Ripani1, B. G. Ritchie5, F. Ronchetti19, G. Rosner17, P. Rossi19, F. Sabatié10, C. Salgado29, J. P. Santoro9,3, V. Sapunenko3, R. A. Schumacher8, V. S. Serov22, Y. G. Sharabian3, E. S. Smith3, L. C. Smith36, D. I. Sober9, A. Stavinsky22, S. S. Stepanyan25, S. Stepanyan3, B. E. Stokes15, I. I. Strakovsky16, S. Strauch16,§, M. Taiuti1, D. J. Tedeschi33, A. Teymurazyan39, U. Thoma3,**, A. Tkabladze16, S. Tkachenko31, L. Todor32, C. Tur33, M. Ungaro2,12, M. F. Vineyard34, A. V. Vlassov22, L. B. Weinstein31, M. Williams8, E. Wolin3, M. H. Wood33,††, A. Yegneswaran3, L. Zana28, J. Zhang31, and B. Zhao12 (CLAS Collaboration)
1Istituto Nazionale di Fisica Nucleare, Sezione di Genova, and Dipartimento di Fisica, Universitá di Genova, 16146 Genova, Italy
2Rensselaer Polytechnic Institute, Troy, New York 12180-3590, USA
3Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
4Rice University, Houston, Texas 77005-1892, 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, California 90747-0005, USA
8Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
9Catholic University of America, Washington, District of Columbia 20064, USA
10CEA-Saclay, Service de Physique Nucléaire, F91191 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
14Florida International University, Miami, Florida 33199, USA
15Florida State University, Tallahassee, Florida 32306, USA
16The George Washington University, Washington, District of Columbia 20052, USA
17University of Glasgow, Glasgow G12 8QQ, United Kingdom
18Idaho State University, Pocatello, Idaho 83209, USA
19INFN, Laboratori Nazionali di Frascati, Frascati, Italy
20Institut de Physique Nucleaire ORSAY, Orsay, France
21Institute for High Energy Physics, Protvino, 142281, Russia
22Institute of Theoretical and Experimental Physics, Moscow, 117259, Russia
23James Madison University, Harrisonburg, Virginia 22807, USA
24Kharkov Institute of Physics and Technology, Kharkov 61108, Ukraine
25Kyungpook National University, Daegu 702-701, South Korea
26University of Massachusetts, Amherst, Massachusetts 01003, USA
27Moscow State University, General 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 Richmond, Richmond, Virginia 23173, USA
33University of South Carolina, Columbia, South Carolina 29208, 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
39University of Kentucky, Lexington, Kentucky 40506, USA
40University of North Carolina, Wilmington, North Carolina 28403, USA
41North Carolina Agricultural and Technical State University, Greensboro, North Carolina 27455, USA
42The Institute of Physical and Chemical Research, RIKEN, Wako, Saitama 351-0198, Japan
Received 22 October 2005; published 31 January 2006
The exclusive reaction γp→K̅ 0K+n was studied in the photon energy range between 1.6 and 3.8 GeV searching for evidence of the exotic baryon Θ+(1540)→nK+. The decay to nK+ requires the assignment of strangeness S=+1 to any observed resonance. Data were collected with the CLAS detector at the Thomas Jefferson National Accelerator Facility corresponding to an integrated luminosity of 70 pb-1. No evidence for the Θ+ pentaquark was found. Upper limits were set on the production cross section as function of center-of-mass angle and nK+ mass. The 95% C.L. upper limit on the total cross section for a narrow resonance at 1540 MeV was found to be 0.8 nb.
© 2006 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.96.042001
DOI:
10.1103/PhysRevLett.96.042001
PACS:
12.39.Mk, 13.60.Rj, 14.20.Jn, 14.80.−j
*Current address: University of New Hampshire, Durham, NH 03824-3568, USA †Current address: Old Dominion University, Norfolk, VA 23529, USA ‡Current address: Massachusetts Institute of Technology, Cambridge, MA 02139-4307, USA §Current address: University of South Carolina, Columbia, SC 29208, USA **Current address: Physikalisches Institut der Universität Gießen, 35392 Giessen, Germany ††Current address: University of Massachusetts, Amherst, MA 01003, USA
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