Search for the Θ-bar- → K-n-bar with PHENIX

The PHENIX experiment at RHIC should be sensitive to decays of the anti-pentaquark Θ-bar- via the K-n-bar channel. Charged kaons can be identified using the standard tracking and time of flight up to a momentum of 1.5 GeV/c. Anti-neutron candidates are detected via their annihilation signal in the highly segmented electromagnetic calorimeter (EMCal). In order to assess the quality of the anti-neutron identification, we reconstruct the Σ-bar→n-barπ. As an additional cross-check, the invariant mass of K+n-bar is reconstructed where no resonance in the pentaquark mass range is expected. At present, no enhancement at the expected pentaquark mass is observed in dAu collisions at √SSS = 200 GeV