Phys. Rev. Lett.
97,
102001
(2006)
[5 pages]
Search for Θ++ Pentaquarks in the Exclusive Reaction γp→K+K-p
V. Kubarovsky et al. The CLAS Collaboration
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V. Kubarovsky1,2, M. Battaglieri3, R. De Vita3, J. Goett1, L. Guo2, G. S. Mutchler6, P. Stoler1, D. P. Weygand2, P. Ambrozewicz16, M. Anghinolfi3, G. Asryan39, H. Avakian2, H. Bagdasaryan33, N. Baillie38, J. P. Ball9, N. A. Baltzell4, V. Batourine27, I. Bedlinskiy24, M. Bellis1,5, N. Benmouna18, B. L. Berman18, A. S. Biselli5, S. Bouchigny22, S. Boiarinov2, R. Bradford5, D. Branford15, W. J. Briscoe18, W. K. Brooks2, S. Bültmann33, V. D. Burkert2, C. Butuceanu38, J. R. Calarco30, S. L. Careccia33, D. S. Carman32, S. Chen17, E. Clinton28, P. L. Cole20, P. Collins9, P. Coltharp17, D. Crabb37, H. Crannell12, V. Crede17, J. P. Cummings1, R. De Masi13, D. Dale40, E. De Sanctis21, P. V. Degtyarenko2, A. Deur2, K. V. Dharmawardane33, C. Djalali4, G. E. Dodge33, J. Donnelly19, D. Doughty14,2, M. Dugger9, O. P. Dzyubak4, H. Egiyan2,*, K. S. Egiyan39, L. Elouadrhiri2, P. Eugenio17, G. Fedotov29, H. Funsten38, M. Y. Gabrielyan40, L. Gan41, M. Garçon13, A. Gasparian42, G. Gavalian30,33, G. P. Gilfoyle34, K. L. Giovanetti25, F. X. Girod13, O. Glamazdin26, J. T. Goetz10, E. Golovach29, A. Gonenc16, C. I. O. Gordon19, R. W. Gothe4, K. A. Griffioen38, M. Guidal22, N. Guler33, V. Gyurjyan2, C. Hadjidakis22, K. Hafidi8, R. S. Hakobyan12, J. Hardie14,2, F. W. Hersman30, K. Hicks32, I. Hleiqawi32, M. Holtrop30, C. E. Hyde-Wright33, Y. Ilieva18, D. G. Ireland19, B. S. Ishkhanov29, E. L. Isupov29, M. M. Ito2, D. Jenkins36, H. S. Jo22, K. Joo7, H. G. Juengst18,†, J. D. Kellie19, M. Khandaker31, W. Kim27, A. Klein33, F. J. Klein12, A. V. Klimenko33, M. Kossov24, L. H. Kramer16,2, J. Kuhn5, S. E. Kuhn33, S. V. Kuleshov24, J. Lachniet5,33, J. M. Laget13,2, J. Langheinrich4, D. Lawrence28, T. Lee30, Ji Li1, K. Livingston19, H. Lu4, M. MacCormick22, N. Markov7, B. McKinnon19, B. A. Mecking2, J. J. Melone19, M. D. Mestayer2, C. A. Meyer5, T. Mibe32, K. Mikhailov24, R. Minehart37, M. Mirazita21, R. Miskimen28, V. Mochalov23, V. Mokeev29, L. Morand13, S. A. Morrow22,13, M. Moteabbed16, P. Nadel-Turonski18, I. Nakagawa43, R. Nasseripour16,4, S. Niccolai22, G. Niculescu25, I. Niculescu25, B. B. Niczyporuk2, M. R. Niroula33, R. A. Niyazov2, M. Nozar2, M. Osipenko3,29, A. I. Ostrovidov17, K. Park27, E. Pasyuk9, C. Paterson19, J. Pierce37, N. Pivnyuk24, D. Pocanic37, O. Pogorelko24, S. Pozdniakov24, J. W. Price10,11, Y. Prok37,‡, D. Protopopescu19, B. A. Raue16,2, G. Riccardi17, G. Ricco3, M. Ripani3, B. G. Ritchie9, F. Ronchetti21, G. Rosner19, P. Rossi21, F. Sabatié13, C. Salgado31, J. P. Santoro12,2, V. Sapunenko2, R. A. Schumacher5, V. S. Serov24, Y. G. Sharabian2, N. V. Shvedunov29, E. S. Smith2, L. C. Smith37, D. I. Sober12, A. Stavinsky24, S. S. Stepanyan27, S. Stepanyan2, B. E. Stokes17, I. I. Strakovsky18, S. Strauch18,§, M. Taiuti3, D. J. Tedeschi4, A. Teymurazyan40, U. Thoma2,**, A. Tkabladze18, S. Tkachenko33, L. Todor34, C. Tur4, M. Ungaro7, M. F. Vineyard35, A. V. Vlassov24, L. B. Weinstein33, M. Williams5, E. Wolin2, M. H. Wood4,††, A. Yegneswaran2, L. Zana30, J. Zhang33, and B. Zhao7 (The CLAS Collaboration)
1Rensselaer Polytechnic Institute, Troy, New York 12180-3590, USA
2Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
3Istituto Nazionale di Fisica Nucleare, Sezione di Genova, and Dipartimento di Fisica, Universitá di Genova, 16146 Genova, Italy
4University of South Carolina, Columbia, South Carolina 29208, USA
5Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
6Rice University, Houston, Texas 77005-1892, USA
7University of Connecticut, Storrs, Connecticut 06269, USA
8Physics Division, Argonne National Laboratory, Argonne, Illinois 60439-4843, USA
9Arizona State University, Tempe, Arizona 85287-1504, USA
10University of California at Los Angeles, Los Angeles, California 90095-1547, USA
11California State University, Dominguez Hills, California 90747-0005, 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
15Edinburgh University, Edinburgh EH9 3JZ, United Kingdom
16Florida International University, Miami, Florida 33199, USA
17Florida State University, Tallahassee, Florida 32306, USA
18The George Washington University, Washington, D.C. 20052, USA
19University of Glasgow, Glasgow G12 8QQ, United Kingdom
20Idaho State University, Pocatello, Idaho 83209, USA
21INFN, Laboratori Nazionali di Frascati, 00044 Frascati, Italy
22Institut de Physique Nucleaire ORSAY, Orsay, France
23Institute for High Energy Physics, Protvino, 142281, Russia
24Institute of Theoretical and Experimental Physics, Moscow, 117259, Russia
25James Madison University, Harrisonburg, Virginia 22807, USA
26Kharkov Institute of Physics and Technology, Kharkov 61108, Ukraine
27Kyungpook National University, Daegu 702-701, Republic of Korea
28University of Massachusetts, Amherst, Massachusetts 01003, USA
29Moscow State University, General Nuclear Physics Institute, 119899 Moscow, Russia
30University of New Hampshire, Durham, New Hampshire 03824-3568, USA
31Norfolk State University, Norfolk, Virginia 23504, USA
32Ohio University, Athens, Ohio 45701, USA
33Old Dominion University, Norfolk, Virginia 23529, USA
34University of Richmond, Richmond, Virginia 23173, 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
40University of Kentucky, Lexington, Kentucky 40506, USA
41University of North Carolina, Wilmington, North Carolina 28403, USA
42North Carolina Agricultural and Technical State University, Greensboro, North Carolina 27455, USA
43The Institute of Physical and Chemical Research, RIKEN, Wako, Saitama 351-0198, Japan
Received 28 April 2006; published 7 September 2006
The reaction γp→pK+K- was studied at Jefferson Lab with photon energies from 1.8 to 3.8 GeV using a tagged photon beam. The goal was to search for a Θ++ pentaquark, a narrow, doubly charged baryon state having strangeness S=+1 and isospin I=1, in the pK+ invariant mass spectrum. No statistically significant evidence of a Θ++ was found. Upper limits on the total and differential cross section for the reaction γp→K-Θ++ were obtained in the mass range from 1.5 to 2.0 GeV/c2, with an upper limit for a narrow resonance with a mass MΘ++=1.54 GeV/c2 of about 0.15 nb, 95% C.L.. This result places a stringent upper limit on the Θ++ width ΓΘ++<0.1 MeV/c2.
© 2006 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.97.102001
DOI:
10.1103/PhysRevLett.97.102001
*Current address: University of NH, Durham, NH 03824-3568, USA †Present address: Old Dominion University, Norfolk, VA 23529, USA ‡Present address: MA Institute of Technology, Cambridge, MA 02139-4307, USA §Present address: University of SC, Columbia, SC 29208, USA **Present address: Physikalisches Institut der Universität Gießen, 35392 Giessen, Germany ††Present address: University of MA, Amherst, MA 01003, USA
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