Evidence for the Strangeness S=+1 Pentaquark from LEPS and CLAS Experiments

Conference · Sun Aug 01 00:00:00 EDT 2004

OSTI ID:840157

Hicks, Ken

There are now several experimental collaborations that have seen evidence for a narrow state in the mass spectrum of the (nK{sup +}) system. Two of these experiments, from the LEPS collaboration in Japan and the CLAS collaboration in the USA, are described briefly. Both use similar photoproduction reactions with a K{sup +}K{sup -} pair in the final state. In addition, data from the CLAS collaboration for the {gamma}p {yields} K{sub s} K{sup +}n reaction are presented for the first time, which has no prominent peak in the (nK{sup +}) mass spectrum when the K{sub s} angle is limited to forward angles.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Energy Research (ER) (US)
• DOE Contract Number: AC05-84ER40150
• OSTI ID: 840157
• Report Number(s): JLAB-PHY-04-317; DOE/ER/40150-3396; hep-ex/0504028; TRN: US0501860
• Resource Relation: Conference: Hadron 2003, Aschaffenburg (DE), 08/31/2003--09/06/2003; Other Information: PBD: 1 Aug 2004
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
HADRONS
PHOTOPRODUCTION
STRANGENESS