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Advances in Hyperon Spectroscopy and Coupled Channel Analysis at JLAB

This document discusses significant advancements in hyperon spectroscopy, particularly the scarce data above 2 GeV and its relationship to N* physics. Coupled channel analyses yield preliminary results for K*Y/KY* cross sections and deep insights into the nature of the L(1405) state, which raises questions about whether it is a three-quark state or a KN bound state. The implications of these findings on future high-energy experiments at JLAB, including canopy upgrades and lattice QCD progress, highlight the importance of ongoing research for understanding resonances and quark models.

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Advances in Hyperon Spectroscopy and Coupled Channel Analysis at JLAB

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  1. S=-1 hyperon spectroscopy • Data scarce above 2GeV • Intimately related to N* physics • Coupled channel analysis • K*Y/KY* preliminary cross section results sizable • L(1405) puzzling: • three quark state/KN bound state? • Hypernuclear spectroscopy: • Hall A, Hall C@JLAB • (Nakamura et al, N.P.A754:421,2005) • L-N scattering: CLAS • J. M. Laget, PRC73:044003,2006 Siegel et al, PRC38:2221,1988 Complete measurement using polarized beam/target (CLAS g8, g13, FROST …) Lei Guo, SURA workshop, DC

  2. Cascade spectroscopy at CLASgp→K+ K+(X) -X Preliminary X- (1530) Oh et al, hep-ph/0605169 • Observed #(X)<<#(N*/D*) • X mass split important • for SU3 flavor independence • Relations to Y* • Future high energy experiments promising (JLAB upgrade) • Lattice QCD progress L 0X GUO hep-ex/0601011 Lei Guo, SURA workshop, DC

  3. S=-3 resonances First measurement of J(W- ) at SLAC:Xc0 W- K+, W-L K- • W discovery benchmark of quark model • Only two states in PDG • Opportunities offered by JLAB upgrade (Hall B, Hall D) gp→K+ K+K0 (X) J(W-)=3/2, if J(Xc0)=1/2 Aubert et al, PRL.97:112001,2006 Lei Guo, SURA workshop, DC

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