Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2003-11-21
Phys.Rev.Lett.92:032001,2004; Erratum-ibid.92:049902,2004
Physics
High Energy Physics
High Energy Physics - Experiment
5 pages, 5 figures, add references
Scientific paper
10.1103/PhysRevLett.92.032001
The reaction $\gamma p \to \pi^+K^-K^+n$ was studied at Jefferson Lab using a tagged photon beam with an energy range of 3-5.47 GeV. A narrow baryon state with strangeness S=+1 and mass $M=1555\pm 10$ MeV/c$^2$ was observed in the $nK^+$ invariant mass spectrum. The peak's width is consistent with the CLAS resolution (FWHM=26 MeV/c$^2$), and its statistical significance is 7.8 $\pm$ 1.0 ~$\sigma$. A baryon with positive strangeness has exotic structure and cannot be described in the framework of the naive constituent quark model. The mass of the observed state is consistent with the mass predicted by a chiral soliton model for the $\Theta^+$ baryon. In addition, the $pK^+$ invariant mass distribution was analyzed in the reaction $\gamma p\to K^-K^+p$ with high statistics in search of doubly-charged exotic baryon states. No resonance structures were found in this spectrum.
for the CLAS Collaboration
Kubarovsky Valery
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