Phys. Rev. Lett.
96,
212001
(2006)
[6 pages]
Search for the Θ+ Pentaquark in the Reaction γd→pK-K+n
B. McKinnon et al. CLAS Collaboration
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B. McKinnon13, K. Hicks28, N. A. Baltzell33, D. S. Carman28, M. D. Mestayer34, T. Mibe28, M. Mirazita15, S. Niccolai17, P. Rossi15, S. Stepanyan34, D. J. Tedeschi33, P. Ambrozewicz10, M. Anghinolfi16, G. Asryan39, H. Avakian34, H. Bagdasaryan29, N. Baillie38, J. P. Ball1, V. Batourine21, M. Battaglieri16, I. Bedlinskiy18, M. Bellis3, N. Benmouna12, B. L. Berman12, A. S. Biselli3, S. Bouchigny17, S. Boiarinov34, R. Bradford3, D. Branford9, W. J. Briscoe12, W. K. Brooks34, S. Bültmann29, V. D. Burkert34, C. Butuceanu38, J. R. Calarco24, S. L. Careccia29, S. Chen11, P. L. Cole14, P. Collins1, P. Coltharp11, D. Crabb37, V. Crede11, D. Dale20, R. De Masi5, R. DeVita16, E. De Sanctis15, P. V. Degtyarenko34, A. Deur34, C. Djalali33, G. E. Dodge29, J. Donnelly13, D. Doughty6,34, M. Dugger1, O. P. Dzyubak33, H. Egiyan34,*, K. S. Egiyan39, L. Elouadrhiri34, P. Eugenio11, G. Fedotov23, G. Feldman12, H. Funsten38, M. Gabrielyan20, L. Gan27, M. Garçon5, A. Gasparian26, G. Gavalian29,*, G. P. Gilfoyle32, K. L. Giovanetti19, F. X. Girod5, J. T. Goetz2, A. Gonenc10, R. W. Gothe33, K. A. Griffioen38, M. Guidal17, N. Guler29, L. Guo34, V. Gyurjyan34, R. S. Hakobyan4, F. W. Hersman24, I. Hleiqawi28, M. Holtrop24, C. E. Hyde-Wright29, Y. Ilieva12, D. G. Ireland13, B. S. Ishkhanov23, M. M. Ito34, D. Jenkins36, H. S. Jo17, K. Joo8, H. G. Juengst29, J. D. Kellie13, M. Khandaker25, W. Kim21, A. Klein29, F. J. Klein4, M. Kossov18, L. H. Kramer10,34, V. Kubarovsky30, J. Kuhn3, S. E. Kuhn29, S. V. Kuleshov18, J. Lachniet29,†, J. Langheinrich33, D. Lawrence22, K. Livingston13, H. Lu33, M. MacCormick17, B. A. Mecking34, C. A. Meyer3, K. Mikhailov18, R. Miskimen22, V. Mokeev23, S. A. Morrow5,17, M. Moteabbed10, G. S. Mutchler31, I. Nakagawa20, P. Nadel-Turonski12, R. Nasseripour33, G. Niculescu19, I. Niculescu19, B. B. Niczyporuk34, M. R. Niroula29, R. A. Niyazov34, M. Nozar34, M. Osipenko16,23, A. I. Ostrovidov11, K. Park21, E. Pasyuk1, C. Paterson13, J. Pierce37, N. Pivnyuk18, O. Pogorelko18, S. Pozdniakov18, J. W. Price7,‡, Y. Prok37,§, D. Protopopescu13, B. A. Raue10,34, G. Ricco16, M. Ripani16, B. G. Ritchie1, F. Ronchetti15, G. Rosner13, F. Sabatié5, C. Salgado25, J. P. Santoro36,34,**, V. Sapunenko34, R. A. Schumacher3, V. S. Serov18, Y. G. Sharabian34, E. S. Smith34, L. C. Smith37, D. I. Sober4, A. Stavinsky18, S. S. Stepanyan21, B. E. Stokes11, P. Stoler30, I. I. Strakovsky12, S. Strauch33, M. Taiuti16, A. Teymurazyan20, U. Thoma34,††, A. Tkabladze12, S. Tkachenko29, C. Tur33, M. Ungaro8, M. F. Vineyard35, A. V. Vlassov18, L. B. Weinstein29, D. P. Weygand34, M. Williams3, E. Wolin34, M. H. Wood33,‡‡, A. Yegneswaran34, L. Zana24, J. Zhang29, B. Zhao8, and Z. Zhao33 (CLAS Collaboration)
1Arizona State University, Tempe, Arizona 85287-1504, USA
2University of California at Los Angeles, Los Angeles, California 90095-1547, USA
3Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
4Catholic University of America, Washington, D.C. 20064, USA
5Service de Physique Nucléaire, CEA-Saclay, F91191 Gif-sur-Yvette, France
6Christopher Newport University, Newport News, Virginia 23606, USA
7California State University, Dominguez Hills, Carson, California 90747, USA
8University of Connecticut, Storrs, Connecticut 06269, 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, D.C. 20052, USA
13University of Glasgow, Glasgow G12 8QQ, United Kingdom
14Idaho State University, Pocatello, Idaho 83209, USA
15Laboratori Nazionali di Frascati, INFN, 00044 Frascati, Italy
16Sezione di Genova, INFN, 16146 Genova, Italy
17Institut de Physique Nucleaire Orsay, Orsay, France
18Institute of Theoretical and Experimental Physics, Moscow, 117259, Russia
19James Madison University, Harrisonburg, Virginia 22807, USA
20University of Kentucky, Lexington, Kentucky 40506, USA
21Kyungpook National University, Daegu 702-701, Republic of Korea
22University of Massachusetts, Amherst, Massachusetts 01003, USA
23General Nuclear Physics Institute, Moscow State University, 119899 Moscow, Russia
24University of New Hampshire, Durham, New Hampshire 03824-3568, USA
25Norfolk State University, Norfolk, Virginia 23504, USA
26North Carolina A & T State University, Greensboro, North Carolina 27411, USA
27University of North Carolina, Wilmington, North Carolina 28403, USA
28Ohio University, Athens, Ohio 45701, USA
29Old Dominion University, Norfolk, Virginia 23529, USA
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
34Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
35Union College, Schenectady, New York 12308, USA
36Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0435, USA
37University of Virginia, Charlottesville, Virginia 22901, USA
38College of William and Mary, Williamsburg, Virginia 23187-8795, USA
39Yerevan Physics Institute, 375036 Yerevan, Armenia
Received 14 March 2006; published 1 June 2006
A search for the Θ+ in the reaction γd→pK-K+n was completed using the CLAS detector at Jefferson Lab. A study of the same reaction, published earlier, reported the observation of a narrow Θ+ resonance. The present experiment, with more than 30 times the integrated luminosity of our earlier measurement, does not show any evidence for a narrow pentaquark resonance. The angle-integrated upper limit on Θ+ production in the mass range of 1.52–1.56 GeV/c2 for the γd→pK-Θ+ reaction is 0.3 nb (95% C.L.). This upper limit depends on assumptions made for the mass and angular distribution of Θ+ production. Using Λ(1520) production as an empirical measure of rescattering in the deuteron, the cross section upper limit for the elementary γn→K-Θ+ reaction is estimated to be a factor of 10 higher, i.e., ∼3 nb (95% C.L.).
© 2006 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.96.212001
DOI:
10.1103/PhysRevLett.96.212001
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: Carnegie Mellon University, Pittsburgh, PA 15213, USA. ‡Current address: University of California at Los Angeles, Los Angeles, CA 90095-1547, USA. §Current address: Massachusetts Institute of Technology, Cambridge, MA 02139-4307, USA. **Current address: Catholic University of America, Washington, D.C. 20064, USA. ††Current address: Physikalisches Institut der Universitaet Giessen, 35392 Giessen, Germany. ‡‡Current address: University of Massachusetts, Amherst, MA 01003, USA.
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