Phys. Rev. Lett.
100,
052001
(2008)
[5 pages]
Bayesian Analysis of Pentaquark Signals from CLAS Data
D. G. Ireland et al. The CLAS Collaboration
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D. G. Ireland1, B. McKinnon1, D. Protopopescu1, P. Ambrozewicz13, M. Anghinolfi18, G. Asryan38, H. Avakian33, H. Bagdasaryan28, N. Baillie37, J. P. Ball3, N. A. Baltzell32, V. Batourine22, M. Battaglieri18, I. Bedlinskiy20, M. Bellis6, N. Benmouna15, B. L. Berman15, A. S. Biselli6,12, L. Blaszczyk14, S. Bouchigny19, S. Boiarinov33, R. Bradford6, D. Branford11, W. J. Briscoe15, W. K. Brooks33, V. D. Burkert33, C. Butuceanu37, J. R. Calarco25, S. L. Careccia28, D. S. Carman33, L. Casey7, S. Chen14, L. Cheng7, P. L. Cole16, P. Collins3, P. Coltharp14, D. Crabb36, V. Crede14, N. Dashyan38, R. De Masi8,19, R. De Vita18, E. De Sanctis17, P. V. Degtyarenko33, A. Deur33, R. Dickson6, C. Djalali32, G. E. Dodge28, J. Donnelly1, D. Doughty9,33, M. Dugger3, O. P. Dzyubak32, K. S. Egiyan38, L. El Fassi2, L. Elouadrhiri33, P. Eugenio14, G. Fedotov24, G. Feldman15, A. Fradi19, H. Funsten37, M. Garçon8, G. Gavalian28, N. Gevorgyan38, G. P. Gilfoyle31, K. L. Giovanetti21, F. X. Girod8,33, J. T. Goetz4, W. Gohn10, A. Gonenc13, R. W. Gothe32, K. A. Griffioen37, M. Guidal19, N. Guler28, L. Guo33, V. Gyurjyan33, K. Hafidi2, H. Hakobyan38, C. Hanretty14, N. Hassall1, F. W. Hersman25, I. Hleiqawi27, M. Holtrop25, C. E. Hyde-Wright28, Y. Ilieva15, B. S. Ishkhanov24, E. L. Isupov24, D. Jenkins35, H. S. Jo19, J. R. Johnstone1, K. Joo10, H. G. Juengst28, N. Kalantarians28, J. D. Kellie1, M. Khandaker26, W. Kim22, A. Klein28, F. J. Klein7, M. Kossov20, Z. Krahn6, L. H. Kramer13,33, V. Kubarovsky33,29, J. Kuhn6, S. V. Kuleshov20, V. Kuznetsov22, J. Lachniet28, J. M. Laget33, J. Langheinrich32, D. Lawrence23, K. Livingston1, H. Y. Lu32, M. MacCormick19, N. Markov10, P. Mattione30, B. A. Mecking33, M. D. Mestayer33, C. A. Meyer6, T. Mibe27, K. Mikhailov20, M. Mirazita17, R. Miskimen23, V. Mokeev24,33, B. Moreno19, K. Moriya6, S. A. Morrow8,19, M. Moteabbed13, E. Munevar15, G. S. Mutchler30, P. Nadel-Turonski15, R. Nasseripour32, S. Niccolai19, G. Niculescu21, I. Niculescu21, B. B. Niczyporuk33, M. R. Niroula28, R. A. Niyazov33, M. Nozar33, M. Osipenko18,24, A. I. Ostrovidov14, K. Park22, E. Pasyuk3, C. Paterson1, S. Anefalos Pereira17, J. Pierce36, N. Pivnyuk20, O. Pogorelko20, S. Pozdniakov20, J. W. Price5, S. Procureur8, Y. Prok36, B. A. Raue13,33, G. Ricco18, M. Ripani18, B. G. Ritchie3, F. Ronchetti17, G. Rosner1, P. Rossi17, F. Sabatié8, J. Salamanca16, C. Salgado26, J. P. Santoro7, V. Sapunenko33, R. A. Schumacher6, V. S. Serov20, Y. G. Sharabian33, D. Sharov24, N. V. Shvedunov24, L. C. Smith36, D. I. Sober7, D. Sokhan11, A. Stavinsky20, S. S. Stepanyan22, S. Stepanyan33, B. E. Stokes14, P. Stoler29, S. Strauch32, M. Taiuti18, D. J. Tedeschi32, A. Tkabladze15, S. Tkachenko28, C. Tur32, M. Ungaro10, M. F. Vineyard34, A. V. Vlassov20, D. P. Watts11, L. B. Weinstein28, D. P. Weygand33, M. Williams6, E. Wolin33, M. H. Wood32, A. Yegneswaran33, L. Zana25, J. Zhang28, B. Zhao10, and Z. W. Zhao32 (The CLAS Collaboration)
1University of Glasgow, Glasgow G12 8QQ, United Kingdom
2Argonne National Laboratory, Argonne, Illinois 60439, USA
3Arizona State University, Tempe, Arizona 85287-1504, USA
4University of California at Los Angeles, Los Angeles, California 90095-1547, USA
5California State University, Dominguez Hills, Carson, California 90747, USA
6Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
7Catholic University of America, Washington, D.C. 20064, USA
8CEA-Saclay, Service de Physique Nucléaire, 91191 Gif-sur-Yvette, France
9Christopher Newport University, Newport News, Virginia 23606, USA
10University of Connecticut, Storrs, Connecticut 06269, USA
11Edinburgh University, Edinburgh EH9 3JZ, United Kingdom
12Fairfield University, Fairfield Connecticut 06824, USA
13Florida International University, Miami, Florida 33199, USA
14Florida State University, Tallahassee, Florida 32306, USA
15The George Washington University, Washington, D.C. 20052, USA
16Idaho State University, Pocatello, Idaho 83209, USA
17INFN, Laboratori Nazionali di Frascati, 00044 Frascati, Italy
18INFN, Sezione di Genova, 16146 Genova, Italy
19Institut de Physique Nucleaire ORSAY, Orsay, France
20Institute of Theoretical and Experimental Physics, Moscow, 117259, Russia
21James Madison University, Harrisonburg, Virginia 22807, USA
22Kyungpook National University, Daegu 702-701, South Korea
23University of Massachusetts, Amherst, Massachusetts 01003, USA
24Moscow State University, General Nuclear Physics Institute, 119899 Moscow, Russia
25University of New Hampshire, Durham, New Hampshire 03824-3568, USA
26Norfolk State University, Norfolk, Virginia 23504, USA
27Ohio University, Athens, Ohio 45701, USA
28Old Dominion University, Norfolk, Virginia 23529, USA
29Rensselaer Polytechnic Institute, Troy, New York 12180-3590, USA
30Rice University, Houston, Texas 77005-1892, USA
31University of Richmond, Richmond, Virginia 23173, USA
32University of South Carolina, Columbia, South Carolina 29208, USA
33Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, 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
Received 20 September 2007; published 6 February 2008
We examine the results of two measurements by the CLAS collaboration, one of which claimed evidence for a Θ+ pentaquark, while the other found no such evidence. The unique feature of these two experiments was that they were performed with the same experimental setup. Using a Bayesian analysis, we find that the results of the two experiments are in fact compatible with each other, but that the first measurement did not contain sufficient information to determine unambiguously the existence of a Θ+. Further, we suggest a means by which the existence of a new candidate particle can be tested in a rigorous manner.
© 2008 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.052001
DOI:
10.1103/PhysRevLett.100.052001
PACS:
12.39.Mk, 13.60.Rj, 14.20.Jn, 14.80.−j
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