{"paper":{"title":"$\\Lambda_b \\to (\\Lambda_c,\\,p)\\,\\tau\\,\\nu$ decays within standard model and beyond","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Rupak Dutta","submitted_at":"2015-12-13T11:22:33Z","abstract_excerpt":"Deviations from the standard model prediction have been observed in several leptonic and semileptonic $B$ meson decays to $\\tau\\nu$ final states mediated via $b \\to u$ and $b \\to c$ charged current interactions. The measured value of ratio of branching ratios $R_{\\pi}^l$ of $B^- \\to \\tau^-\\,\\nu_{\\tau}$ to $B^0 \\to \\pi^+\\,\\l^-\\,\\nu$ decays, where $l = (e,\\,\\mu)$, is larger than the standard model prediction by more than a factor of two. Similarly, a combined excess of $3.9\\sigma$ from the standard model expectation has been reported by HFAG for the values of $R_D$ and $R_{D^{\\ast}}$, where $R_{"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1512.04034","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":""},"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"}