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arxiv: hep-ex/0403011 · v1 · submitted 2004-03-05 · ✦ hep-ex

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
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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
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keywords evidencenarrowreactionresonancesigmasubsystemassumptionsbackground
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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.

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