{"paper":{"title":"Electromagnetic form factors of $\\Lambda$ hyperon in the vector meson dominance model and a possible explanation of the near-threshold enhancement of the $e^+e^- \\to \\Lambda\\bar{\\Lambda}$ reaction","license":"http://creativecommons.org/licenses/by-sa/4.0/","headline":"","cross_cats":["nucl-th"],"primary_cat":"hep-ph","authors_text":"An-Xin Dai, Ju-Jun Xie, Zhong-Yi Li","submitted_at":"2021-07-22T07:37:58Z","abstract_excerpt":"The near-threshold $e^+e^- \\to \\Lambda\\bar{\\Lambda}$ reaction is studied with the assumption that the production mechanism is due to a near-$\\Lambda \\bar{\\Lambda}$-threshold bound state. The cross section of $e^+e^- \\to \\Lambda\\bar{\\Lambda}$ reaction is parametrized in terms of the electromagnetic form factors of $\\Lambda$ hyperon, which are obtained with the vector meson dominance model. It is shown that the contribution to the $e^+e^- \\to \\Lambda\\bar{\\Lambda}$ reaction from a new narrow state with quantum numbers $J^{PC}=1^{--}$ is dominant for energies very close to threshold. The mass of t"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2107.10499","kind":"arxiv","version":3},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2107.10499/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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"}