Photoproduction of Λ*(1405)/Σ*(1385) at LEPS/SPring8

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Photoproduction of Λ*(1405)/Σ*(1385) at LEPS/SPring8 RCNP, Osaka University DEUKSOON AHN APSE2010

(using linearly polarized photon beam) Physics Motivation Λ(1405) : Meson-baryon resonance or 3-quark System ? Σ(1385) with JP=3/2+ , I=1, and S=-1 Λ(1405) with JP=1/2- , I=0, and S=-1 ~20 MeV I. LEPS spectrometer +TPC LEPS data, PRC78,035202(2008)M.Niiyama g p K+ L(1405)  K+ S +p – K+ S -p + p K+ Σ(1385)  K+ L p 0 L*/S* = 0.54  0.17 0.084 ± 0.076 Strong Energy dependence! II. LEPS spectrometer@ Forward angle High Statistics ! To understand the production Mechanism, - Differential Cross section Photon Beam Asymmetry (using linearly polarized photon beam) p K+ L(1405) / Σ(1385) : Using missing mass of K+ APSE2010

Photon Beam Asymmetry for Λ*(1405)and Σ*(1385) Σ >0 ; Natural parity exchange Σ <0 ; Unnatural parity exchange Σ(1385) dominant - K* exchange ? Λ*(1405) /Σ*(1385) APSE2010

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