{"paper":{"title":"$D^{\\ast}$ polarization vs. $R_{D^{(\\ast)}}$ anomalies in the leptoquark models","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ex"],"primary_cat":"hep-ph","authors_text":"Kei Yamamoto, Ryoutaro Watanabe, Syuhei Iguro, Teppei Kitahara, Yuji Omura","submitted_at":"2018-11-21T19:00:00Z","abstract_excerpt":"Polarization measurements in $\\bar{B} \\to D^{(\\ast)} \\tau \\overline{\\nu}$ are useful to check consistency in new physics explanations for the $R_{D}$ and $R_{D^{\\ast}}$ anomalies. In this paper, we investigate the $D^{\\ast}$ and $\\tau$ polarizations and focus on the new physics contributions to the fraction of a longitudinal $D^{\\ast}$ polarization ($F_{L}^{D^{\\ast}}$), which is recently measured by the Belle collaboration $F_{L}^{D^{\\ast}} = 0.60 \\pm 0.09$, in model-independent manner and in each single leptoquark model (${\\rm R}_2$, ${\\rm S}_1$ and ${\\rm U}_1$) that can naturally explain the"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1811.08899","kind":"arxiv","version":3},"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"}