Distinctive patterns are predicted by quenched quark models and unquenched quark models for the lowest SU(3) baryon nonet with spin parity $J^P=1/2^{-}$. While the quenched quark models predict the lowest $1/2^{-}$ ${\Sigma }^{*}$ resonance to be above 1600 MeV, the unquenched quark models predict it to be around ${\Sigma }^{*}(1385)$ energy. Here we reexamine some old data of the $K^{-}p\to \Lambda {\pi }^{+}{\pi }^{-}$ reaction and find that besides the well-established ${\Sigma }^{*}(1385)$ with $J^P=3/2^{+}$, there is indeed some evidence for the possible existence of a new ${\Sigma }^{*}$ resonance with $J^P=1/2^{-}$ around the same mass but with broader decay width. Higher statistic data on relevant reactions are needed to clarify the situation.

• Received 23 June 2009

DOI:https://doi.org/10.1103/PhysRevD.80.017503