Abstract
We have searched for evidence of the production and decay of a neutral bound-state pentaquark, one of a predicted doublet of states: P 0 c ̄ s =| c ̄ suud〉 and P − c ̄ s =| c ̄ sddu〉 . Specifically, we have searched for the decay P 0 c ̄ s →K ∗0K −p in data from Fermilab experiment E791, in which a 500 GeV/ c π − beam interacted with nuclear targets. We find mass-dependent upper limits at the 90% confidence level for the ratio of cross section times branching fraction of this decay relative to that for the decay D s −→K ∗0K − . The upper limits vary between 0.016 and 0.036 for M(P 0 c ̄ s ) between 2.75 and 2.91 GeV/ c 2, assuming a pentaquark lifetime of 0.4 ps.
Published Version
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