Study of correlation of confined quarks using high-energy Laser-Electron photon beam

The linearly polarized photon beam is produced by backward-Compton scattering of laser photons from8GeV electrons at BL33LEP.The curr ent LEPS facility studies photo-production of hadrons in the forward angles，where the high linear polarization plays an essential role to decompose various reaction processes.New DUV laser was introduced to LEPS，which improved the maximum energy from 2.4 GeV to 3 GeV。The parallel injection system was constructed and the beam intensity was improved by a factor of2.The penta-quarkΘstudy was carried out in the·d→K Kp n reactions.Background processes due toγp reactions were identified by energy loss information in a plastic counter that was placed just after the liquid-deuterium target。A clear signal enhancement was seen in theγn contributions。

The linearly polarized photon beam is produced by backward-Compton scattering of laser photons from 8 GeV electrons at BL33LEP. The curr ent LEPS facility studies photo-production of hadrons in the forward angles, where the high linear polarization plays an essential role to decompose various reaction processes. New DUV laser was introduced to LEPS, which improved the maximum energy from 2.4 GeV to 3 GeV. The parallel injection system was constructed and the beam intensity was improved by a factor of 2. The penta-quark Θ+study was carried out in the ・ d → K+Kp n reactions. background processes due to γp reactions were identified by energy loss information in a plastic counter that was placed just after the liquid-deuterium target. A clear signal enhancement was seen in the γn contributions.