PubDB | BELLE2-PUB-PH-2025-034

Abstract	We test lepton flavor universality by measuring the branching-fraction ratios $R(D^{()}) \equiv \mathcal{B}(\bar{B} \rightarrow D^{()} \tau^{-} \bar{\nu}_{\tau})/\mathcal{B}(\bar{B} \rightarrow D^{()} \ell^{-} \bar{\nu}_{\ell})$, where $\ell$ denotes an electron or muon. The analysis uses $387\times 10^6$ $\Upsilon(\mathrm{4S}) \rightarrow B\bar{B}$ decays collected with the Belle~II detector in energy-asymmetric $e^+e^-$ collisions. One $B$ meson is fully reconstructed in a hadronic decay mode, while the other is reconstructed either in $\bar{B}\rightarrow D^{()}\tau^{-}\bar{\nu}_{\tau}$, with $\tau^- \rightarrow \ell^- \bar{\nu}_{\ell}\nu_{\tau}$, or in $\bar{B}\rightarrow D^{()}\ell^{-}\bar{\nu}_{\ell}$. We extract the signal from the distributions of the residual calorimeter energy and the squared mass of the undetected particles, obtaining $R(D^{}) = 0.242 \pm0.019(\mathrm{stat}) \pm0.016(\mathrm{syst})$ and $R(D) = 0.439 \pm 0.055(\mathrm{stat}) \pm 0.045(\mathrm{syst})$. These results are consistent with both the standard model predictions and previous measurements, and constitute the most precise determination of $R(D^{(*)})$ with hadronic tagging.
Tags	Run 1
Working group	Semileptonic and Missing Energy Decay
Principal authors	@ Taichiro Koga, Lin Wang, Qi-Dong Zhou, Toru Iijima, Koji Hara, Kodai Matsuoka, Katsuro Nakamura, Kenta Uno, Agrim Aggarwal, Markus Prim
Reference	PRL
Links	arXiv:2609.21947

Abstract

We test lepton flavor universality by measuring the branching-fraction ratios $R(D^{(*)}) \equiv \mathcal{B}(\bar{B} \rightarrow D^{(*)} \tau^{-} \bar{\nu}_{\tau})/\mathcal{B}(\bar{B} \rightarrow D^{(*)} \ell^{-} \bar{\nu}_{\ell})$, where $\ell$ denotes an electron or muon. The analysis uses $387\times 10^6$ $\Upsilon(\mathrm{4S}) \rightarrow B\bar{B}$ decays collected with the Belle~II detector in energy-asymmetric $e^+e^-$ collisions. One $B$ meson is fully reconstructed in a hadronic decay mode, while the other is reconstructed either in $\bar{B}\rightarrow D^{(*)}\tau^{-}\bar{\nu}_{\tau}$, with $\tau^- \rightarrow \ell^- \bar{\nu}_{\ell}\nu_{\tau}$, or in $\bar{B}\rightarrow D^{(*)}\ell^{-}\bar{\nu}_{\ell}$. We extract the signal from the distributions of the residual calorimeter energy and the squared mass of the undetected particles, obtaining $R(D^{*}) = 0.242 \pm0.019(\mathrm{stat}) \pm0.016(\mathrm{syst})$ and $R(D) = 0.439 \pm 0.055(\mathrm{stat}) \pm 0.045(\mathrm{syst})$. These results are consistent with both the standard model predictions and previous measurements, and constitute the most precise determination of $R(D^{(*)})$ with hadronic tagging.

Measurement of $R(D^{(*)})$ with the hadronic FEI tagging method using LS1 dataset