{"paper":{"title":"Decay $X(3872)\\to\\pi^0\\pi^+\\pi^-$ and $S$-wave $D^0\\bar D^0 \\to\\pi^+\\pi^-$ scattering length","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ex","nucl-th"],"primary_cat":"hep-ph","authors_text":"G.N. Shestakov, N.N. Achasov","submitted_at":"2019-04-04T05:09:35Z","abstract_excerpt":"The isospin-breaking decay $X(3872)\\to(D^*\\bar D+ \\bar D^*D) \\to\\pi^0D\\bar D\\to\\pi^0\\pi^+\\pi^-$ is discussed. In its amplitude there is a triangle logarithmic singularity, due to which the dominant contribution to $BR(X(3872)\\to\\pi^0\\pi^+\\pi^-)$ comes from the production of the $\\pi^+\\pi^-$ system in a narrow interval of the invariant mass $m_{\\pi^+\\pi^-}$ near the value of $2m_{D^0} \\approx 3.73$ GeV. The analysis shows that $BR(X(3872)\\to\\pi^0 \\pi^+\\pi^-)$ can be expected at the level of $10^{-3}$--$10^{-4}$. This estimate includes, in particular, the assumption that the $S$-wave inelastic s"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1904.02352","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"}