{"paper":{"title":"Lepton-pair production in di-pion $\\tau$ lepton decays","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ex"],"primary_cat":"hep-ph","authors_text":"G. L\\'opez Castro, J. L. Guti\\'errez Santiago, P. Roig","submitted_at":"2020-12-02T22:53:46Z","abstract_excerpt":"We study the $\\tau^- \\to \\nu_{\\tau} \\pi^{-}\\pi^{0}\\ell^{+}\\ell^{-}$ ($\\ell=e,\\,\\mu$) decays, which are $O(\\alpha^2)$-suppressed with respect to the dominant di-pion tau decay channel. Both the inner-bremsstrahlung and the structure- (and model-)dependent contributions are considered. In the $\\ell=e$ case, structure-dependent effects are $\\mathcal{O}(1\\%)$ in the decay rate, yielding a clean prediction of its branching ratio, $2.3\\times10^{-5}$, measurable with BaBar or Belle(-II) data. For $\\ell=\\mu$, both contributions have similar magnitude and we get a branching fraction of $(1.6\\pm0.3)\\tim"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2012.01587","kind":"arxiv","version":1},"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/2012.01587/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"}