Evidence for a new $Sigma^{*}$ resonance with $J^P=1/2^-$ in the old data of $K^-ptoLambdapi^+pi^-$ reaction

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 re-examine some old data of the $kp to la$ 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.