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We report a measurement of the branching fraction ratios R(D(*)) of Bbar ->D(*) tau- nubar_tau relative to Bbar -> D()* l- nubar_l (where l = e or mu)using the full Belle data sample of 772 x 10^6 BBbar pairs collected at theY(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e-collider. The measured values are R(D)= 0.375 +- 0.064(stat.) +- 0.026(syst.)and R(D*) = 0.293 +- 0.038(stat.) +- 0.015(syst.). The analysis uses hadronicreconstruction of the tag-side B meson and purely leptonic tau decays. Theresults are consistent with earlier measurements and do not show a significantdeviation from the standard model prediction.

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

Measurement of the branching ratio of $\bar{B} \to D^{(\ast)} \tau^-  \bar{\nu}_\tau$ relative to $\bar{B} \to D^{(\ast)} \ell^- \bar{\nu}_\ell$  decays with hadronic tagging at Belle