Search for the Low-Lying Excited Baryon <i>Σ</i> <sup>*</sup> (1/2 <sup>−</sup> ) through Process <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msubsup> <mml:mi>Λ</mml:mi> <mml:mi>c</mml:mi> <mml:mo>+</mml:mo> </mml:msubsup> <mml:mo>→</mml:mo> <mml:mi>Λ</mml:mi> <mml:msup> <mml:mi>K</mml:mi> <mml:mn>0</mml:mn> </mml:msup> <mml:msup> <mml:mi>π</mml:mi> <mml:mo>+</mml:mo> </mml:msup> </mml:mrow> </mml:math>
Sheng-Chao Zhang, Wen-Tao Lyu, Guan-Ying Wang, Bo-Qiang Ma, En Wang
原始摘要（英文原文）· Original abstract
Abstract Motivated by recent BESIII measurements of the singly Cabibbo-suppressed processes Λ c + → Λ K + π 0 and Λ c + → Λ K S 0 π + , we investigate the process Λ c + → Λ K 0 π + by taking into account the contribution from the low-lying excited baryon Σ * (1/2 − ), dynamically generated via the S-wave pseudoscalar meson-octet baryon interaction, as well as from the intermediate resonances K * (892) and N (1535). Our model successfully reproduces the BESIII π + K 0 invariant mass distribution, and predicts a distinct cusp structure around 1.43 GeV in the π + Λ invariant mass distribution, which is associated with the predicted Σ * (1/2 − ). Future high-precise measurements of this process at BESIII, Belle II, and the proposed Super Tau-Charm Facility experiments will be crucial for testing the existence of Σ * (1/2 − ) and advancing our understanding of the light baryon spectrum.