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The unquenched quark models predict the new particle $\Sigma^*$ with spinparity $J^P=1/2^-$ and its mass is around the well established $\Sigma^*(1385)$with $J^P=3/2^+$. Here by using the effective Lagrangian approach we study \kp\reaction at the range of $\Lambda^{*}(1520)$ peak, comparing the resultingtotal cross section, and $\pi^+\pi^-$, $\Lambda\pi^+$, $\Lambda\pi^-$ invariantsquared mass distributions for various incident $K^-$ momenta, as well as theproduction angular distribution of the $\Lambda$ with the data from theLawrence Berkeley Laboratory 25-inch hydrogen bubble chamber, we find that,apart from the existing resonance $\Sigma^{*}(1385)$ with $J^P=3/2^+$, there isa strong evidence for the existence of the new resonance $\Sigma^{*}$ with$J^P=1/2^-$ around 1380 MeV. Higher statistic data on relevant reactions areneeded to clarify the situation.

Further evidence for the $\Sigma^{*}$ resonance with $J^P=1/2^-$ around 1380 MeV