{"paper":{"title":"$\\Lambda_b \\to \\Lambda_c \\tau \\bar{\\nu}_{\\tau}$ Decay in the Standard Model and with New Physics","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Alakabha Datta, Shanmuka Shivashankara, Wanwei Wu","submitted_at":"2015-02-25T16:27:59Z","abstract_excerpt":"Recently hints of lepton flavor non-universality emerged when the BaBar Collaboration observed deviations from the standard model predictions in $R(D^{(*)}) \\equiv {\\cal B}({\\bar B} \\to D^{(*)+} \\tau^- {\\bar\\nu}_\\tau) / {\\cal B}({\\bar B} \\to D^{(*)+} \\ell^- {\\bar\\nu}_\\ell)$ ($\\ell =e,\\mu$). Another test of this non-universality can be in the semi leptonic $\\Lambda_{b}\\to\\Lambda_{c}\\tau\\bar{\\nu}_{\\tau}$ decay. In this work we present predictions for this decay in the standard model and in the presence of new-physics operators with different Lorentz structures. We present the most general four-f"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1502.07230","kind":"arxiv","version":4},"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"}