H1prelim-06-131

Search for Baryonic States Decaying to $\Xi\pi$ in Deep Inelastic Scattering at HERA.

Reference Jan Olsson, presented at ICHEP'06, Summer 2006
Document Conference paper
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Contact Marc del Degan, Christoph Grab
Abstract A search for narrow baryonic states decaying into $\Xi^{-}\pi^{-}$ or\ $\Xi^{-}\pi^{+}$ and their antiparticles is carried out with the H1 detector using deep inelastic scattering events at HERA, at centre-of-mass energies of 300 and 318$\gev$. No signal is observed for a new baryonic state in the mass range 1600 - 2100$\mev$ in neither the $\Xi^{-}\pi^{-}$ nor the $\Xi^{-}\pi^{+}$ decay channels. % that could be interpreted as a possible pentaquark state. The standard baryon izero is observed through the decay mode $\Xi(1530)^{0} ightarrow\Xi^{-}\pi^{+}$. Upper limits on the ratio of the hypothetical pentaquark states imm and ipm to the izero signal are given.
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