Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2003-07-08
Phys.Rev.Lett.91:252001,2003
Physics
High Energy Physics
High Energy Physics - Experiment
5 pages, 5 figures
Scientific paper
10.1103/PhysRevLett.91.252001
In an exclusive measurement of the reaction $\gamma d \to K^+ K^- p n$, a narrow peak that can be attributed to an exotic baryon with strangeness $S=+1$ is seen in the $K^+n$ invariant mass spectrum. The peak is at $1.542\pm 0.005$ GeV/c$^2$ with a measured width of 0.021 GeV/c$^2$ FWHM, which is largely determined by experimental mass resolution. The statistical significance of the peak is $5.2 \pm 0.6 \sigma$. The mass and width of the observed peak are consistent with recent reports of a narrow $S=+1$ baryon by other experimental groups.
collaboration The CLAS
Stepanyan Samuel
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