Abstract:
A search for a manifestly exotic S=-2 baryon state decaying to Xi-pi-, and its neutral partner decaying to Xi-pi+, has been performed using 220 pb-1 of p[overline p] collisions at sqrt(s)=1.96 TeV collected by the Collider Detector at Fermilab. The Xi- trajectories were measured in a silicon tracker before their decay, resulting in a sample with low background and excellent position resolution. No evidence was found for S=-2 pentaquark candidates in the invariant mass range of 1600--2100 MeV/c2. Upper limits on the product of pentaquark production cross section times its branching fraction to Xi-pi+,-, relative to the cross section of the well-established Xi(1530) resonance, are presented for neutral and doubly negative candidates with pT>2 GeV/c and |y|
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