Phys. Rev. Lett.
97,
032001
(2006)
[6 pages]
Search for the Θ+ Pentaquark in the γd→ΛnK+ Reaction Measured with the CLAS Spectrometer
S. Niccolai et al. CLAS Collaboration
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S. Niccolai1, M. Mirazita2, P. Rossi2, N. A. Baltzell3, D. S. Carman4, K. Hicks4, B. McKinnon5, T. Mibe4, S. Stepanyan6, D. J. Tedeschi3, G. Adams30, P. Ambrozewicz17, S. Anefalos Pereira2,38, M. Anghinolfi21, G. Asryan37, H. Avakian6, H. Bagdasaryan29, N. Baillie36, J. P. Ball8, V. Batourine24, M. Battaglieri21, I. Bedlinskiy22, M. Bektasoglu4, M. Bellis30,11, N. Benmouna19, B. L. Berman19, A. S. Biselli11, S. Boiarinov6, S. Bouchigny1, R. Bradford11, D. Branford16, W. J. Briscoe19, W. K. Brooks6, S. Bültmann29, V. D. Burkert6, C. Butuceanu36, J. R. Calarco27, S. L. Careccia29, B. Carnahan12, S. Chen18, P. L. Cole12,20,6, P. Collins8, P. Coltharp18, D. Crabb35, H. Crannell12, V. Crede18, J. P. Cummings30, N. Dashyan37, P. V. Degtyarenko6, R. De Masi13, A. Deppman38, E. De Sanctis2, A. Deur6, R. DeVita21, K. V. Dharmawardane29, C. Djalali3, G. E. Dodge29, J. Donnelly5, D. Doughty14,6, M. Dugger8, O. P. Dzyubak3, H. Egiyan6,*, K. S. Egiyan37, L. El Fassi7, L. Elouadrhiri6, P. Eugenio18, G. Fedotov26, G. Feldman19, H. Funsten36, M. Garçon13, G. Gavalian27,29, G. P. Gilfoyle32, K. L. Giovanetti23, F. X. Girod13, J. T. Goetz9, A. Gonenc17, C. I. O. Gordon5, R. W. Gothe3, K. A. Griffioen36, M. Guidal1, N. Guler29, L. Guo6, V. Gyurjyan6, C. Hadjidakis1, K. Hafidi7, H. Hakobyan37, R. S. Hakobyan12, J. Hardie14,6, F. W. Hersman27, I. Hleiqawi4, M. Holtrop27, C. E. Hyde-Wright29, Y. Ilieva19, D. G. Ireland5, B. S. Ishkhanov26, E. L. Isupov26, M. M. Ito6, D. Jenkins34, H. S. Jo1, K. Joo15, H. G. Juengst19,29, J. D. Kellie5, M. Khandaker28, W. Kim24, A. Klein29, F. J. Klein12, A. V. Klimenko29, M. Kossov22, L. H. Kramer17, V. Kubarovsky30, J. Kuhn11, S. E. Kuhn29, S. V. Kuleshov22, J. Lachniet11,29, J. Langheinrich3, D. Lawrence25, T. Lee27, Ji Li30, K. Livingston5, H. Lu3, M. MacCormick1, N. Markov15, B. A. Mecking6, J. Mellor35, J. J. Melone5, M. D. Mestayer6, C. A. Meyer11, K. Mikhailov22, R. Minehart35, R. Miskimen25, V. Mokeev26, L. Morand13, S. A. Morrow1,13, M. Moteabbed17, G. S. Mutchler31, P. Nadel-Turonski19, J. Napolitano30, R. Nasseripour17,3, G. Niculescu23, I. Niculescu23, B. B. Niczyporuk6, M. R. Niroula29, R. A. Niyazov6, M. Nozar6, J. de Oliveira Echeimberg2,38, M. Osipenko21,26, A. I. Ostrovidov18, K. Park24, E. Pasyuk8, C. Paterson5, J. Pierce35, N. Pivnyuk22, D. Pocanic35, O. Pogorelko22, S. Pozdniakov22, B. M. Preedom3, J. W. Price10, Y. Prok35,6,†, D. Protopopescu5, B. A. Raue17, G. Riccardi18, G. Ricco21, M. Ripani21, B. G. Ritchie8, F. Ronchetti2, G. Rosner5, F. Sabatié13, C. Salgado28, J. P. Santoro34,6,‡, V. Sapunenko6, R. A. Schumacher11, V. S. Serov22, Y. G. Sharabian6, N. V. Shvedunov26, E. S. Smith6, L. C. Smith35, D. I. Sober12, A. Stavinsky22, S. S. Stepanyan24, B. E. Stokes18, P. Stoler30, I. I. Strakovsky19, S. Strauch19,3, M. Taiuti21, U. Thoma6,§, A. Tkabladze4,19, S. Tkachenko29, L. Todor32, C. Tur3, M. Ungaro15, M. F. Vineyard33, A. V. Vlassov22, D. P. Watts5,**, L. B. Weinstein29, D. P. Weygand6, M. Williams11, E. Wolin6, M. H. Wood3,††, A. Yegneswaran6, L. Zana27, J. Zhang29, B. Zhao15, and Z. Zhao3 (CLAS Collaboration)
1Institut de Physique Nucléaire, Orsay, France
2INFN, Laboratori Nazionali di Frascati, 00044 Frascati, Italy
3University of South Carolina, Columbia, South Carolina 29208, USA
4Ohio University, Athens, Ohio 45701, USA
5University of Glasgow, Glasgow G12 8QQ, United Kingdom
6Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
7Argonne National Laboratory, Argonne, Illinois 60439, USA
8Arizona State University, Tempe, Arizona 85287-1504, USA
9University of California at Los Angeles, Los Angeles, California 90095-1547, USA
10California State University, Dominguez Hills, Carson, California 90747, USA
11Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
12Catholic University of America, Washington, D.C. 20064, USA
13CEA-Saclay, Service de Physique Nucléaire, F91191 Gif-sur-Yvette, France
14Christopher Newport University, Newport News, Virginia 23606, USA
15University of Connecticut, Storrs, Connecticut 06269, USA
16Edinburgh University, Edinburgh EH9 3JZ, United Kingdom
17Florida International University, Miami, Florida 33199, USA
18Florida State University, Tallahassee, Florida 32306, USA
19The George Washington University, Washington, D.C. 20052, USA
20Idaho State University, Pocatello, Idaho 83209, USA
21INFN, Sezione di Genova, 16146 Genova, Italy
22Institute of Theoretical and Experimental Physics, Moscow, 117259, Russia
23James Madison University, Harrisonburg, Virginia 22807, USA
24Kyungpook National University, Daegu 702-701, Republic of Korea
25University of Massachusetts, Amherst, Massachusetts 01003, USA
26General Nuclear Physics Institute, Moscow State University, 119899 Moscow, Russia
27University of New Hampshire, Durham, New Hampshire 03824-3568, USA
28Norfolk State University, Norfolk, Virginia 23504, 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
33Union College, Schenectady, New York 12308, USA
34Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0435, USA
35University of Virginia, Charlottesville, Virginia 22901, USA
36College of William and Mary, Williamsburg, Virginia 23187-8795, USA
37Yerevan Physics Institute, 375036 Yerevan, Armenia
38Physics Institute, University of Sao Paulo, Sao Paulo, Brazil
Received 26 April 2006; published 17 July 2006
For the first time, the reaction γd→ΛnK+ has been analyzed in order to search for the exotic pentaquark baryon Θ+(1540). The data were taken at Jefferson Laboratory, using the Hall-B tagged-photon beam of energy between 0.8 and 3.6 GeV and the CEBAF Large Acceptance Spectrometer (CLAS). No statistically significant structures were observed in the nK+ invariant-mass distribution. The upper limit on the γd→ΛΘ+ integrated cross section has been calculated and found to be between 5 and 25 nb, depending on the production model assumed. The upper limit on the differential cross section is also reported.
© 2006 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.97.032001
DOI:
10.1103/PhysRevLett.97.032001
PACS:
12.39.Mk, 13.60.Rj, 14.20.Jn
*Current address: University of New Hampshire, Durham, NH 03824-3568, 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: Edinburgh University, Edinburgh EH9 3JZ, United Kingdom. ††Current address: Current address: University of Massachusetts, Amherst, MA 01003, USA.
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