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arXiv · 0909.4183

Formation of a narrow baryon resonance with positive strangeness in K^+ collisions with Xe nuclei

V. V. Barmin·A. E. Asratyan·V. S. Borisov·C. Curceanu·G. V. Davidenko·A. G. Dolgolenko·C. Guaraldo·M. A. Kubantsev·I. F. Larin·V. A. Matveev·V. A. Shebanov·N. N. Shishov·L. I. Sokolov·G. K. Tumanov·V. S. Verebryusov
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Abstract

The data on the charge-exchange reaction K^+Xe --> K^0 p Xe, obtained with the bubble chamber DIANA, are reanalyzed using increased statistics and updated selections. Our previous evidence for formation of a narrow pK^0 resonance with mass near 1538 MeV is confirmed and reinforced. The statistical significance of the signal reaches some 8σ(6σ) when estimated as S/\sqrt{B} (S/\sqrt{B+S}). The mass and intrinsic width of the Θ^+ baryon are measured as m = (1538+-2) MeV and Γ= (0.39+-0.10) MeV.

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V. V. Barmin, A. E. Asratyan, V. S. Borisov, C. Curceanu, G. V. Davidenko, A. G. Dolgolenko, C. Guaraldo, M. A. Kubantsev, I. F. Larin, V. A. Matveev, V. A. Shebanov, N. N. Shishov, L. I. Sokolov, G. K. Tumanov, V. S. Verebryusov. 2009-09-23. Formation of a narrow baryon resonance with positive strangeness in K^+ collisions with Xe nuclei. https://doi.org/10.1134/s1063778810070100

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