Further evidence for the Σ* resonance with Jᵖ=1/2- around 1380 MeV

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The unquenched quark models predict the new particle Σ* with spin parity Jᵖ=1/2- and its mass is around the well established Σ*(1385) with Jᵖ=3/2+. Here by using the effective Lagrangian approach we study reaction at the range of Λ*(1520) peak, comparing the resulting total cross section, and π+π-, Λπ+, Λπ- invariant squared mass distributions for various incident K- momenta, as well as the production angular distribution of the Λ with the data from the Lawrence Berkeley Laboratory 25-inch hydrogen bubble chamber, we find that, apart from the existing resonance Σ*(1385) with Jᵖ=3/2+, there is a strong evidence for the existence of the new resonance Σ* with Jᵖ=1/2- around 1380 MeV. Higher statistic data on relevant reactions are needed to clarify the situation.