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arXiv · hep-ex/0304040

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

V. V. Barmin·V. S. Borisov·G. V. Davidenko·A. G. Dolgolenko·C. Guaraldo·I. F. Larin·V. A. Matveev·C. Petrascu·V. A. Shebanov·N. N. Shishov·L. I. Sokolov·G. K. Tumanov
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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 $Γ\le 9 MeV/c$^2$. The statistical significance of the enhancement is near $4.4σ$. 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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V. V. Barmin, V. S. Borisov, G. V. Davidenko, A. G. Dolgolenko, C. Guaraldo, I. F. Larin, V. A. Matveev, C. Petrascu, V. A. Shebanov, N. N. Shishov, L. I. Sokolov, G. K. Tumanov. 2003-09-18. Observation of a baryon resonance with positive strangeness in K+ collisions with Xe nuclei. https://doi.org/10.1134/1.1611587

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