R(D*) at Belle II

Sumitted to PubDB: 2023-03-01

Category: Talk, Visibility: Public

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Authors	Qi-Dong Zhou
Date	Feb. 9, 2023
Belle II Number	BELLE2-TALK-CONF-2023-014
Abstract	Measurement of branching ratio $R(D^{})$ of $B \rightarrow D^{} \tau \nu_{\tau}$ relative to $B \rightarrow D^{*} \ell \nu_{\ell}$ decays with hadronic tagging is performed by using data sample of $198 \times 10^{6}$ $B\bar{B}$ pairs collected at the $\Upsilon(4S)$ 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