Observation of a baryon resonance with positive strangeness in K+ collisions with Xe nuclei
Abstract
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.
- Publication:
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Physics of Atomic Nuclei
- Pub Date:
- September 2003
- DOI:
- 10.1134/1.1611587
- arXiv:
- arXiv:hep-ex/0304040
- Bibcode:
- 2003PAN....66.1715B
- Keywords:
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- High Energy Physics - Experiment
- E-Print:
- 9 pages, 4 figures