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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 ;
Date:	23 Sep 2009
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 8sigma (6sigma) when estimated as S/sqrt{B} (S/sqrt{B+S}). The mass and intrinsic width of the Theta^+ baryon are measured as m = (1538+-2) MeV and Gamma = (0.39+-0.10) MeV.
Source:	arXiv, 0909.4183
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