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Meson spectroscopy with unitary coupled-channels model . Satoshi Nakamura Excited Baryon Analysis Center ( EBAC), JLab. Collaborators : H. Kamano (RCNP), T.-S.H. Lee (ANL), T. Sato (Osaka U). Why hadron spectroscopy ?. How. J PC , s pectrum, d ecay pattern key information
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Meson spectroscopy with unitary coupled-channels model Satoshi Nakamura Excited Baryon Analysis Center (EBAC), JLab Collaborators: H. Kamano (RCNP), T.-S.H. Lee (ANL), T. Sato (Osaka U)
Why hadron spectroscopy ? How JPC , spectrum, decay pattern key information Quark-gluon dynamics (QCD) in non-perturbative regime Partial wave analysis (PWA) Reliable analysis tool needed ! Data
Analysis ofthree-meson productionse.g., E852 (BNL) p pppp pChung et al., PRD 65, 072001 (2001) isobar model * ppsubsystem forms a resonance * 3rd p is a spectator
Question Unitarity ? Coupled-channels ?
Question to be addressed How 3-body unitarity makes a difference in extracting hadron properties from data ? Method 1. Construct a unitary and an isobar models 2. Fit them to the same Dalitz plot 3. Extract and compareM*properties from them (pole position, coupling strength to decay channels)
ppmodel Coupled-channels eq. for ppscattering (L ,I ) Fitted to data
Coupling strength to decay channels Unitary model Isobar model
Coupling strength to decay channels p2(1670) r pf2p0 W=1 GeV W=1.66 GeV a1(1230) f0 p0r p [degree] Unitary Isobar