{"paper":{"title":"QED Corrections to $B^-\\to\\tau^-\\bar\\nu_\\tau$","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Claudia Cornella, Matthias K\\\"onig, Matthias Neubert, Max Ferr\\'e","submitted_at":"2026-07-14T18:00:04Z","abstract_excerpt":"Using a sequence of effective field theories (EFTs), we calculate the rate for the leptonic decay $B^-\\to\\tau^-\\bar\\nu_\\tau(\\gamma)$ including real and virtual QED corrections, with a cut $E_{\\rm cut}\\ll\\Lambda_{\\rm QCD}$ imposed on electromagnetic radiation in the $B$-meson rest frame. We establish a factorization theorem for the rate and evaluate it at $\\mathcal{O}(\\alpha)$, resumming the leading logarithmic corrections to all orders in perturbation theory. The large mass $m_\\tau$ allows us to treat the tau lepton as a heavy fermion below $\\mu\\sim m_B\\sim m_\\tau$, leading to an EFT construct"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.13144","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/2607.13144/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"}