Measurement of an excess of B ¯ → D ( * ) τ − ν ¯ τ decays and implications for charged Higgs bosons

Based on the full BABAR data sample, we report improved measurements of the ratios $\mathcal{R}(D)=\mathcal{B}(\overline{B}\ensuremath{\rightarrow}D{\ensuremath{\tau}}^{\ensuremath{-}}{\overline{\ensuremath{\nu}}}_{\ensuremath{\tau}})/\mathcal{B}(\overline{B}\ensuremath{\rightarrow}D{\ensuremath{\ell}}^{\ensuremath{-}}{\overline{\ensuremath{\nu}}}_{\ensuremath{\ell}})$ and $\mathcal{R}({D}^{*})=\mathcal{B}(\overline{B}\ensuremath{\rightarrow}{D}^{*}{\ensuremath{\tau}}^{\ensuremath{-}}{\overline{\ensuremath{\nu}}}_{\ensuremath{\tau}})/\mathcal{B}(\overline{B}\ensuremath{\rightarrow}{D}^{*}{\ensuremath{\ell}}^{\ensuremath{-}}{\overline{\ensuremath{\nu}}}_{\ensuremath{\ell}})$, where $\ensuremath{\ell}$ refers to…

• NS
  National Science Foundation
• UD
  U.S. Department of Energy
• AP
  Alfred P. Sloan Foundation
• EC
  European Commission
• DF
  Deutsche Forschungsgemeinschaft
• MO
  Ministry of Education and Science of the Russian Federation
• NF
  Norges Forskningsråd
• IN
  Istituto Nazionale di Fisica Nucleare
• SA
  Science and Technology Facilities Council

  Awards: ST/K001604/1, ST/J005568/1, ST/H001085/1, ST/K000748/1, ST/H001085/2, PP/E000460/1
• SN
  SLAC National Accelerator Laboratory