Search for the Theta+ Pentaquark in the Reaction gammad-->pK0K-(p) with CLAS

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

DOI:https://doi.org/10.1063/1.2813796· OSTI ID:921065

Baltzell, Nathan A

A search for photo-production of the Theta+(1540) pentaquark and its decay to pK0 was performed with the CLAS detector system at Jefferson Lab. In the exclusive channel gammad-->pK0sK-(p), about twenty-thousand events with a slow missing proton, pi+pi- decay of the neutral kaon, and photon energy between 1.6 and 3.6 GeV are fully reconstructed. Included are numerous hyperon and meson resonances, with their decays to pK- and K0K- respectively. To understand the possibility of a pentaquark signal amidst the backgrounds, a phenomenological isobar-inspired model of complex Breit-Wigner amplitudes and decay angular distributions for the resonances is fit to the data with a maximum likelihood method. No pentaquark signal is found above the background. The upper limit on the total production cross section is measured to be consistent with other channels published by the collaboration, but systematic studies are still in progress.

• Research Organization: Thomas Jefferson National Accelerator Facility, Newport News, VA
• Sponsoring Organization: USDOE - Office of Science (SC)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 921065
• Report Number(s): JLAB-PHY-07-754; DOE/OR/23177-0246
• Conference Information: Journal Name: AIP Conference Proceedings Journal Volume: 947
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
AMPLITUDES
ANGULAR DISTRIBUTION
CROSS SECTIONS
DECAY
HYPERONS
MESONS
NUCLEAR PHYSICS
PHOTONS
PRODUCTION