The Study Of The Hyperon Spectroscopy

With a chiral quark model, we studied the important components’strong de-cay properties of the hyperon spectroscopy, which are Ξ and A resonances. While, we also study the A resonances contributions in the reaction K-p�'Aη at low energies.For Ξ resonances, we get that:(ⅰ) S(1690) and S(1820) could be classified as the state|70,28) with spin-parity JP=1/2-and with spin-parity JP=3/2-, respectively. These two negative parity states might exist slight configuration mixing;(ⅱ) Ξ(1950) might correspond to several different Ξ resonances. The broad states (Γ～100MeV) observed in the Ξπ channel could be assigned to the pure octet state|70,48,1,1,5/2-) with JP=5/2-or the mixed JP=1/2-state|Ξ1/2-)3. Meanwhile, the moderate width (Γ～60MeV) state observed in the same channel might classified as the excitation|56,410,2,2,1/2+) with JP=1/2+;(ⅲ) Ξ(2030) could not be correspond to either any pure JP=5/2+states or any spin-parity JP=7/2+configurations.For the low-lying negative parity A resonances, by study the reaction K-p�'Aη at low energies, we get that:(ⅰ) The reaction K-p�'Aη is dominated by A(1670)S01around threshold, and A(1670)<S01has a strong coupling to Aη;(ⅱ) The D-wave state A(1690)D03has negligibly small contributions in the scattering of K-p�'Aη for its tiny coupling to Aη. On the other hand, combining studying those low-lying negative parity A resonances, we further understand that:(ⅰ) The s-wave states, A(14O5)S01and A(1670)S01, can be two mixed states with spin-parity JP=1/2-, respectively;(ⅱ) The d-wave states, A(1520)D03and A(1690)D03, are most likely two mixed states with spin-parity JP=3/2-;(ⅲ) In addition, we also predict the strong decay properties of the missing sate|A3/2-)3(M-1.8GeV), which might be discovered in the Σπ and E(1385)π channels.