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25 April 2024

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Evidence for a narrow resonance at 1530 MeV/c2 in the K0 p - system of the reaction pp --> Sigma+ K0 p from the COSY-TOF experiment
M.Abdel-Bary ; S.Abdel-Samad ; K.-Th.Brinkmann ; H.Clement ; E.Doroshkevich ; M.Drochner ; S.Dshemuchadse ; A.Erhardt ; W.Eyrich ; D.Filges ; A.Filippi ; H.Freiesleben ; M.Fritsch ; J.Georgi ; A.Gillitzer ; D.Hesselbarth ; R.Jaekel ; B.Jakob ; L.Karsch ; K.Kilian ; H.Koch ; J.Kress ; E.Kuhlmann ; S.Marcello ; S.Marwinski ; R.Meier ; P.Michel ; K.Moeller ; H.Moertel ; H.P.Morsch ; N.Paul ; L.Pinna ; C.Pizzolotto ; M.Richter ; E.Roderburg ; P.Schoenmeier ; W.Schroeder ; M.Schulte-Wissermann ; T.Sefzick ; F.Stinzing ; G.Y.Sun ; A.Teufel ; A.Ucar ; G.J.Wagner ; M.Wagnerc ; A.Wilms ; P.Wintz ; St.Wirth ; P.Wuestner ;
Date:	5 Mar 2004
Journal:	Phys.Lett. B595 (2004) 127-134
Subject:	hep-ex
Abstract:	The hadronic reaction pp --> Sigma+ K0 p was measured exclusively at a beam momentum of 2.95 GeV/c using the TOF detector at the COSY storage ring. A narrow peak was observed in the invariant mass spectrum of the K0 p subsystem at 1530 +- 5 MeV/c2 with a significance of 4 - 6 standard deviations, depending on background assumptions. The upper limit of 18 +- 4 MeV/c2 (FWHM) for its width is given by the experimental resolution. The corresponding total cross section is estimated to be about 0.4 +- 0.1(stat) +- 0.1(syst) microbarn. Since a resonance in this subsystem must have strangeness S = + 1 we claim it to be the Theta+ state for which very recently evidence was found in various experiments.
Source:	arXiv, hep-ex/0403011
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