Sumitted to PubDB: 2023-03-01

Category: Talk, Visibility: Public

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Authors	Qi-Dong Zhou
Date	2023-02-09
Belle II Number	BELLE2-TALK-CONF-2023-014
Abstract	Measurement of branching ratio $R(D^{\ast })$ of $B\to D^{\ast }\tau {\nu }_{\tau }$ relative to $B\to D^{\ast }\ell {\nu }_{\ell }$ decays with hadronic tagging is performed by using data sample of $198\times {10}^6$ $B\overline{B}$ pairs collected at the $\mathrm{{\rm Y}}(4S)$ resonance with the Belle~II detector at the SuperKEKB asymmetric-energy $e^{+}{e}^{-}$ collider. The analysis uses hadronic reconstruction of the tag-side $B$ meson based on Full Event Interpretation technique and purely leptonic $\tau$ decays on signal-side $B$ meson. We will report the methodology and expected sensitivity, as well as part of the expected systematic uncertainty. language:
Conference	7th KEK Flavour-Factory Workshop

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