Search for narrow pbar p resonances in the reaction pbar p>pbar p pi+pi-

A. Buzzo , P. Debevec , D. Drijard , R.A. Eisenstein , C. Evangelista , W. Eyrich , H. Fischer , J. Franz

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R. Geyer N.H. Hamann P.G. Harris D.W. Hertzog S.A. Hughes T. Johansson R.T. Jones K. Kilian K. Kirsebom H. Korsmo M. Lo Vetere M. Macri M. Marinelli M. Moosburger B. Mouellic W. Oelert S. Ohlsson A. Palano S. Passaggio J.-M. Perreau M.G. Pia S. Pomp M. Price P.E. Reimer J. Ritter E. Robutti K. Rohrich M. Rook E. Rossle A. Santroni H. Schmitt T. Sefzick O. Steinkamp F. Stinzing B. Stugu H. Wirth

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classification ✦ hep-ex

keywords pbarbeennarrowreactionresonancessearchbelowcern-lear

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The reaction pbar p -> pbar p pi+ pi- has been studied with high statistics at CERN-LEAR with incident pbar momenta from 1.65 to 2.0 GeV/c by the JETSET (PS202) experiment. The aim of this paper is to search for narrow resonances decaying to pbar p. No evidence for such structures is found. In particular, an upper limit for the production of a 2.02 GeV state with a width of Gamma = 20 MeV, having been seen in other hadroproduction experiments, is established. Our results restrict the cross section for such a peak to be below 200 nb at the 95% confidence level.

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Search for narrow pbar p resonances in the reaction pbar p>pbar p pi+pi-

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