{"paper":{"title":"Search for the $\\Sigma^*$ state in $\\Lambda^+_c \\to \\pi^+ \\pi^0 \\pi^-\\Sigma^+$ decay by triangle singularity","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ex","nucl-ex","nucl-th"],"primary_cat":"hep-ph","authors_text":"Eulogio Oset, Ju-Jun Xie","submitted_at":"2018-11-17T23:52:31Z","abstract_excerpt":"A $\\Sigma^*$ resonance with spin-parity $J^P = 1/2^-$ and mass in the vicinity of the $\\bar{K}N$ threshold has been predicted in the unitary chiral approach and inferred from the analysis of CLAS data on the $\\gamma p \\to K^+ \\pi^0 \\Sigma^0$ reaction. In this work, based on the dominant Cabibbo favored weak decay mechanism, we perform a study of $\\Lambda_c^+ \\to \\pi^+ \\pi^0 \\Sigma^*$ with the possible $\\Sigma^*$ state decaying into $\\pi^- \\Sigma^+$ through a triangle diagram. This process is initiated by $ \\Lambda_c^+ \\to \\pi^+ \\bar{K}^*N $, then the $\\bar{K}^*$ decays into $\\bar{K} \\pi$ and $"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1811.07247","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}