{"paper":{"title":"Triangle singularity enhancing isospin violation in $\\bar B_s^0 \\to J/\\psi \\pi^0 f_0(980)$","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ex"],"primary_cat":"hep-ph","authors_text":"E. Oset, Ju-Jun Xie, S. Sakai, Wei-Hong Liang","submitted_at":"2017-11-13T14:46:41Z","abstract_excerpt":"We perform calculations for the $\\bar B_s^0 \\to J/\\psi \\pi^0 f_0(980)$ and $\\bar B_s^0 \\to J/\\psi \\pi^0 a_0(980)$ reactions, showing that the first one is isospin-suppressed while the second one is isospin-allowed. The reaction proceeds via a triangle mechanism, with $\\bar B_s^0 \\to J/\\psi K^* \\bar K +c.c.$, followed by the decay $K^* \\to K\\pi$ and a further fusion of $K\\bar K$ into the $f_0(980)$ or $a_0(980)$. We show that the mechanism develops a singularity around the $\\pi^0 f_0(980)$ or $\\pi^0 a_0(980)$ invariant mass of 1420 MeV where the $\\pi^0 f_0$ and $\\pi^0 a_0$ decay modes are magni"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1711.04603","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"}