The status of pentaquark baryons

Conference · Thu Jun 01 04:00:00 EDT 2006

OSTI ID:917696

Burkert, V D

The status of the search for peritaquark baryon states is reviewed in light of new results from the first two dedicated experiments from CLAS at Jefferson Lab and of new analyses from several labs on the Theta^+(1540). Evidence for and against the heavier pentaquark states, the Xi(1862) and the Theta^0_c(3100) observed at CERN and at HERA, respectively, are also discussed. I conclude that the evidence against the latter two heavier pentaquark baryons is rapidly increasing making their existence highly questionable. I also conclude that the evidence for the Theta^+ state has significantly eroded with the recent CLAS results, and just leaves room for a possible state with an intrinsic width of Gamma < 0.5 MeV. Preliminary new evidence from various experiments will be discussed as well.

• Research Organization: Thomas Jefferson National Accelerator Facility, Newport News, VA
• Sponsoring Organization: USDOE - Office of Energy Research (ER)
• DOE Contract Number: AC05-84ER40150
• OSTI ID: 917696
• Report Number(s): JLAB-PHY-05-490; DOE/ER/40150-4362
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
BARYONS
CEBAF ACCELERATOR
CERN
QUARKS