Analysis of Σ* via isospin selective reaction 𝐾 𝐿 𝑝 →𝜋 + Σ 0
The isospin-selective reaction 𝐾 𝐿 𝑝 →𝜋 + Σ 0 provides a clean probe for investigating 𝐼 =1 Σ* resonances. In this work, we perform an analysis of this reaction using an effective Lagrangian approach for the first time, incorporating the well-established Σ(1189)1/2 + , Σ(1385)3/2 + , Σ(1670)3/2 − , and Σ(1775)5/2 − states, while also exploring contributions from other unestablished states. By fitting the available differential cross-section and recoil polarization data, adhering to partial-wave phase conventions same as the Particle Data Group, we find that besides the established resonances, contributions from Σ(1660)1/2 + , Σ(1580)3/2 − , and a Σ*(1/2 − ) improve the description. Notably, a Σ*(1/2 − ) resonance with mass around 1.54 GeV, consistent with Σ(1620)1/2 − , is found to be essential for describing the data in this channel, a stronger indication than found in previous analyses focusing on 𝜋Λ final states. While providing complementary support for Σ(1660)1/2 + and Σ(1580)3/2 − , our results highlight the importance of the Σ(1620)1/2 − region in 𝐾 𝐿 𝑝 →𝜋 + Σ 0 . Future high-precision measurements are needed to solidify these findings and further constrain the Σ* spectrum.