{"paper":{"title":"Radiative corrections to $\\tau \\to \\pi (K) \\nu_\\tau [\\gamma]$: a reliable new physics test","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"G. Hern\\'andez-Tom\\'e, G. L\\'opez-Castro, I. Rosell, M. A. Arroyo-Ure\\~na, P. Roig","submitted_at":"2021-07-09T18:00:05Z","abstract_excerpt":"The ratios $R_{\\tau/P}\\equiv \\Gamma(\\tau \\to P \\nu_\\tau [\\gamma]) / \\Gamma(P \\to\\mu \\nu_\\mu[\\gamma])$ ($P=\\pi, K$) provide sensitive tests of lepton universality $\\left|g_\\tau/g_\\mu\\right|=1$ and are a useful tool for new physics searches. The radiative corrections to $R_{\\tau/P}$ are computed following a large-$N_C$ expansion to deal with hadronic effects: Chiral Perturbation Theory is enlarged by including the lightest multiplets of spin-one heavy states such that the relevant Green functions are well-behaved at high energies. We find $\\delta R_{\\tau/\\pi}=(0.18\\pm 0.57 )\\%$ and $\\delta R_{\\t"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2107.04603","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2107.04603/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"}