Observation of a baryon resonance with positive strangeness in K+ collisions with Xe nuclei

Details Observation of a baryon resonance with positive strangeness in K+ collisions with Xe nuclei Observation of a baryon resonance with positive strangeness in K+ collisions with Xe nuclei

2003-04-30

arxiv.org/abs/hep-ex/0304040v4

Phys.Atom.Nucl.66:1715-1718,2003; Yad.Fiz.66:1763-1766,2003

Physics

High Energy Physics

High Energy Physics - Experiment

9 pages, 4 figures

Scientific paper

10.1134/1.1611587

The status of our investigation of low-energy $K^+$Xe collisions in the Xenon bubble chamber DIANA is reported. In the charge-exchange reaction $K^+Xe \to K^0 p Xe'$ the spectrum of $K^0 p$ effective mass shows a resonant enhancement with $M = 1539 \pm 2$ MeV/c$^2$ and $\Gamma \le 9 MeV/c$^2$. The statistical significance of the enhancement is near $4.4\sigma$. The mass and width of the observed resonance are consistent with expectations for the lightest member of the anti-decuplet of exotic pentaquark baryons, as predicted in the framework of the chiral soliton model.

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