Bayesian analysis of pentaquark signals from CLAS data

CLAS Collaboration, D. G. Ireland, B. McKinnon, D. Protopopescu, P. Ambrozewicz, M. Anghinolfi, G. Asryan, H. Avakian, H. Bagdasaryan, N. Baillie, J. P. Ball, N. A. Baltzell, V. Batourine, M. Battaglieri, I. Bedlinskiy, M. Bellis, N. Benmouna, B. L. Berman, A. S. Biselli, L. BlaszczykS. Bouchigny, S. Boiarinov, R. Bradford, D. Branford, W. J. Briscoe, W. K. Brooks, V. D. Burkert, C. Butuceanu, J. R. Calarco, S. L. Careccia, D. S. Carman, L. Casey, S. Chen, L. Cheng, P. L. Cole, P. Collins, P. Coltharp, D. Crabb, V. Crede, N. Dashyan, R. De Masi, R. De Vita, E. De Sanctis, P. V. Degtyarenko, A. Deur, R. Dickson, C. Djalali, G. E. Dodge, J. Donnelly, D. Doughty, D. P. Watts

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We examine the results of two measurements by the CLAS collaboration, one of which claimed evidence for a Theta(+) 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 Theta(+). Further, we suggest a means by which the existence of a new candidate particle can be tested in a rigorous manner.

Original languageEnglish
Article number052001
Pages (from-to)-
Number of pages5
JournalPhysical Review Letters
Issue number5
Publication statusPublished - 8 Feb 2008

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