Search for the Pentaquark at COMPASS
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Narrow Ξ -π ± and Ξ +π ± resonances produced by quasi-real photons have been searched for by the COMPASS experiment at CERN. The study was stimulated by the recent observation of an exotic baryonic state decaying into Ξ -π +, at a mass of 1862 MeV, interpreted as a pentaquark. While the ordinary hyperon states Ξ (1530) 0 and Ξ(1530) 0 are clearly seen, no exotic baryon is observed in the data taken in 2002 and 2003. © Springer-Verlag / Società Italiana di Fisica 2005.
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The COMPASS Collaboration, ..