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

A.E. Asratyan; A.G. Dolgolenko; C. Curceanu; C. Guaraldo; G.K. Tumanov; G.V. Davidenko; I.F. Larin; L.I. Sokolov; M.A. Kubantsev; N.N. Shishov

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

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arxiv 0909.4183 v1 pith:3TZPUBWT submitted 2009-09-23 hep-ex

V.V. Barmin , A.E. Asratyan , V.S. Borisov , C. Curceanu , G.V. Davidenko , A.G. Dolgolenko , C. Guaraldo , M.A. Kubantsev

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I.F. Larin V.A. Matveev V.A. Shebanov N.N. Shishov L.I. Sokolov G.K. Tumanov V.S. Verebryusov (DIANA Collaboration)

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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 8\sigma (6\sigma) 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.

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