Evidence for the Strangeness S=+1 Pentaquark from LEPS and CLAS Experiments

Abstract

There are now several experimental collaborations that have seen evidence for a narrow state in the mass spectrum of the ($n{K}^{+}$) system. Two of these experiments, from the LEPS collaboration in Japan and the CLAS collaboration in the USA, are described briefly. Both use similar photoproduction reactions with a $K^{+}{K}^{-}$ pair in the final state. In addition, data from the CLAS collaboration for the $\gamma p\to K_s{K}^{+}n$ reaction are presented for the first time, which has no prominant peak in the ($n{K}^{+}$) mass spectrum when the $K_s$ angle is limited to forward angles.

arXiv commentHadron 2003 Conference Proceedings (5 pages)

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