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Quenched and unquenched quark models predict very different patterns for thespectrum of the low excited hyperon states. Evidence is accumulating for theexistence of some new hyperon resonances, such as a $\Sigma^*$ of spin-parity$J^P=1/2^-$ around 1400 MeV instead of 1620 MeV as listed in PDG, a new$\Sigma(1540)3/2^-$ resonance, a new narrow $\Lambda(1670)3/2^-$ resonance anda new $\Lambda(1680)3/2^+$ resonance. All these new hyperon resonances fit inthe predicted pattern of the unquenched quark models very well. It is extremelyimportant to check and establish the spectrum of these low excited hyperonstates by the proposed $K_L$ beam experiments at JLAB.

Evidence for Some New Hyperon Resonances -- to be Checked by $K_L$ Beam Experiments