Search for Phi(1862) Pentaquark States with CLAS

Conference · Mon Oct 01 04:00:00 EDT 2007

OSTI ID:1963887

Egiyan, Hovanes ^[1]

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1. University of New Hampshire

Following the first observations of the possible S = +1 pentaquark state Phi+(1540), there have been many experiments in various laboratories to confirm these results and to search for states which could be associated with other members of the pentaquark antidecuplet. The NA49 collaboration reported the observation of narrow S = ?2 states with masses about 1860 GeV showing in the Xi-pi invariant mass spectra. These states were identified as isospin 3/2 members of the pentaquark antidecuplet, and were named Phi(1862). However, other experiments have failed to reproduce these results. A new experiment has recently been performed at Jefferson Lab using the CLAS detector to search for the Phi(1862) state in photoproduction on a deuterium target. A large amount of data has been collected and analyzed, and approximately two thousand pi?Xi? events were identified. The preliminary invariant mass spectrum of the pi?Xi? system, where the Phi--(1862) pentaquark state is expected, will be presented and discussed.

• Research Organization: Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 1963887
• Report Number(s): JLAB-PHY-07-951; DOE/OR/23177-5898
• Country of Publication: United States
• Language: English