A Bayesian analysis of pentaquark signals from CLAS data

Abstract

We examine the results of two measurements by the CLAS collaboration, one of which claimed evidence for a ${\Theta }^{+}$ pentaquark, whilst 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.

5 pages, 3 figures

References in corpus (3)

• Observation of an Exotic $S=+1$ Baryon in Exclusive Photoproduction from the Deuteron
• A Nested Sampling Algorithm for Cosmological Model Selection
• Search for the ${\Theta }^{+}$ pentaquark in the reaction $\gamma d\to p{K}^{-}{K}^{+}n$

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• SU(6), Triquark states, and the pentaquark
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