articlePhysical Review LettersSep 6, 2012LVGREEN OA

Evidence for an Excess of B ¯ → D ( * ) τ − ν ¯ τ Decays

Centre National de la Recherche Scientifique · Laboratoire d’Annecy de Physique des Particules · +95 more institutions

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Abstract

Based on the full BABAR data sample, we report improved measurements of the ratios $\mathcal{R}({D}^{(*)})=\mathcal{B}(\overline{B}\ensuremath{\rightarrow}{D}^{(*)}{\ensuremath{\tau}}^{\ensuremath{-}}{\overline{\ensuremath{\nu}}}_{\ensuremath{\tau}})/\mathcal{B}(\overline{B}\ensuremath{\rightarrow}{D}^{(*)}{\ensuremath{\ell}}_{\ensuremath{\ell}}^{\ensuremath{-}}{\overline{\ensuremath{\nu}}}_{\ensuremath{\ell}})$, where $\ensuremath{\ell}$ is either $e$ or $\ensuremath{\mu}$. These ratios are sensitive to new physics contributions in the form of a charged Higgs boson. We measure $\mathcal{R}(D)=0.440\ifmmode\pm\else\textpm\fi{}0.058\ifmmode\pm\else\textpm\fi{}0.042$ and…

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