{"paper":{"title":"The $\\eta$ decay into 3$\\pi$ in asymmetric nuclear medium","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ph"],"primary_cat":"nucl-th","authors_text":"Shuntaro Sakai, Teiji Kunihiro","submitted_at":"2014-09-09T00:02:34Z","abstract_excerpt":"We explore how the $\\eta$-$\\pi^0$ mixing angle and the $\\eta$ meson decay into $\\pi^{+}\\pi^{-}\\pi^0$ and 3$\\pi^{0}$ are modified in the nuclear medium on the basis of the in-medium chiral effective theory with the isospin asymmetry $\\alpha$ varied, where $\\alpha\\equiv \\delta\\rho/\\rho$ with $\\delta \\rho=\\rho_n-\\rho_p$ and $\\rho=\\rho_n+\\rho_p$. We find that the larger the isospin asymmetry $\\delta \\rho$ and smaller the total density $\\rho$, the more enhanced the mixing angle. We show that the decay width in the nuclear medium has an additional density dependence which cannot be renormalized into"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1409.2554","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":""},"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"}