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26 April 2024

» arxiv » hep-ex/0603017

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Further evidence for 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 ;
Date:	8 Mar 2006
Abstract:	A narrow pKo resonance with mass of 1537 +- 2 MeV/c^2 has been observed in the charge-exchange reaction K+n->KoP on a neutron bound in the Xenon nucleus. Visible width of the peak is consistent with being entirely due to instrumental smearing and allows to place an upper limit on intrinsic width Gamma < 9 MeV/c^2. The signal is observed in a restricted interval of incident K+ momentum, that is consistent with smearing of a narrow pKo resonance by Fermi motion of the target neutron. Statistical significance of the signal is some 7.3, 5.3, and 4.3 standard deviations for the estimators S/sqrt{B}, S/sqrt{S+B}, and S/sqrt{S + 2B}, respectively. This observation confirms and reinforces our earlier results based on part of the present statistics, and offers strong evidence for formation of a pentaquark baryon with positive strangeness in the charge-exchange reaction K+n->KoP on a bound neutron.
Source:	arXiv, hep-ex/0603017
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