Berlin 2005 – scientific programme
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HK: Physik der Hadronen und Kerne
HK 9: Elektromagnetische und Hadronische Proben
HK 9.3: Talk
Friday, March 4, 2005, 17:15–17:30, TU MA004
Observation of an excited neutral hyperon state in pp collisions* — •Izabella Zychor1, Vladimir Koptev2, Markus Büscher3, Michael Hartmann3, Irakli Keshelashvili3, Vera Kleber4, Rudiger Koch3, Sigfried Krewald3, Yoshikazu Maeda3, Siergiej Mikirtichyants2, Michail Nekipelov2,3, and Hans Ströher3 — 1The Andrzej Sołtan Institute for Nuclear Studies, 05400 Świerk, Poland — 2High Energy Physics Department, Petersburg Nuclear Physics Institute, 188350 Gatchina, Russia — 3Institut für Kernphysik, Forschungszentrum Jülich, 52425 Jülich, Germany — 4Institut für Kernphysik, Universität zu Köln, 550937 Köln, Germany
The reaction pp → pK+ Y0* → pK+π±X∓ has been studied with the ANKE spectrometer at COSY Jülich in order to investigate heavy hyperon production. The momentum of the proton beam, incident on a hydrogen cluster-jet target, was 3.65 GeV/c. Protons, kaons and pions were identified with the ANKE detector system consisting of range telescopes, scintillation counters and multi–wire proportional chambers. The missing mass spectra MM(pK+) have been analyzed for both positive and negative charge final states and compared with extensive Monte Carlo simulations. Indications for a neutral excited hyperon resonance Y0*(1480) have been found. Consistent results for its mass and width as well as a production cross section were obtained for both final states. Experimental details, analysis procedure and a possible interpretation of this state will be discussed.
* supported by FZJ, BMBF, DFG