A test of lepton flavor universality with a measurement of $R(D^{*})$ using hadronic $B$ tagging at the Belle II experiment
Creators: name: Adachi, I.
name: Adamczyk, K.
name: Aggarwal, L.
name: Ahmed, H.
name: Aihara, H.
name: Akopov, N.
name: Aloisio, A.
name: Anh Ky, N.
name: Asner, D. M.
name: Atmacan, H.
name: Aushev, T.
name: Aushev, V.
name: Aversano, M.
name: Ayad, R.
name: Babu, V.
name: Bae, H.
name: Bahinipati, S.
name: Bambade, P.
name: Banerjee, Sw.
name: Bansal, S.
name: Barrett, M.
name: Baudot, J.
name: Bauer, M.
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name: Becherer, F.
name: Becker, J.
name: Bennett, J. V.
name: Bernlochner, F. U.
name: Bertacchi, V.
name: Bertemes, M.
name: Bertholet, E.
name: Bessner, M.
name: Bettarini, S.
name: Bhuyan, B.
name: Bianchi, F.
name: Bierwirth, L.
name: Bilka, T.
name: Bilokin, S.
name: Biswas, D.
name: Bobrov, A.
name: Bodrov, D.
name: Bolz, A.
name: Bondar, A.
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name: Campajola, M.
name: Cao, L.
name: Casarosa, G.
name: Cecchi, C.
name: Cerasoli, J.
name: Chang, M.-C.
name: Chang, P.
name: Cheaib, R.
name: Cheema, P.
name: Chen, C.
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name: Chilikin, K.
name: Chirapatpimol, K.
name: Cho, H.-E.
name: Cho, K.
name: Cho, S.-J.
name: Choi, S.-K.
name: Choudhury, S.
name: Cochran, J.
name: Corona, L.
name: Cremaldi, L. M.
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name: De Pietro, G.
name: de Sangro, R.
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name: Domínguez Jiménez, I.
name: Dong, T. V.
name: Dorigo, M.
name: Dort, K.
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name: Dubey, S.
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name: Ecker, P.
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name: Grammatico, T.
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name: Greenwald, D.
name: Gruberová, Z.
name: Gu, T.
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name: Hedges, M. T.
name: Heidelbach, A.
name: de la Cruz, I. Heredia
name: Hernández Villanueva, M.
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name: Kim, K.-H.
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name: Mehta, R.
name: Meier, F.
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name: Metzner, F.
name: Milesi, M.
name: Miller, C.
name: Mirra, M.
name: Miyabayashi, K.
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name: Mizuk, R.
name: Mohanty, G. B.
name: Molina-Gonzalez, N.
name: Mondal, S.
name: Moneta, S.
name: Moser, H.-G.
name: Mrvar, M.
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name: Nakamura, K. R.
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name: Panta, A.
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name: Tonelli, D.
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name: Trabelsi, K.
name: Tsaklidis, I.
name: Uchida, M.
name: Ueda, I.
name: Uematsu, Y.
name: Uglov, T.
name: Unger, K.
name: Unno, Y.
name: Uno, K.
name: Uno, S.
name: Urquijo, P.
name: Ushiroda, Y.
name: Vahsen, S. E.
name: van Tonder, R.
name: Varvell, K. E.
name: Veronesi, M.
name: Vinokurova, A.
name: Vismaya, V. S.
name: Vitale, L.
name: Vobbilisetti, V.
name: Volpe, R.
name: Wach, B.
name: Wakai, M.
name: Wallner, S.
name: Wang, E.
name: Wang, M.-Z.
name: Wang, X. L.
name: Wang, Z.
name: Warburton, A.
name: Watanabe, M.
name: Watanuki, S.
name: Wessel, C.
name: Wiechczynski, J.
name: Won, E.
name: Xu, X. P.
name: Yabsley, B. D.
name: Yamada, S.
name: Yang, S. B.
name: Yelton, J.
name: Yin, J. H.
name: Yoshihara, K.
name: Yuan, C. Z.
name: Yusa, Y.
name: Zhang, B.
name: Zhang, Y.
name: Zhilich, V.
name: Zhou, Q. D.
name: Zhou, X. Y.
name: Zhukova, V. I.
name: Žlebčík, R.
name: Belle-II Collaboration
Publisher: name: Deutsches Elektronen-Synchrotron, DESY, Hamburg
Year: 2024
Subjects: electron positron: annihilation
electron positron: colliding beams
Upsilon(10570): electroproduction
B: pair production
branching ratio: ratio: measured
B: branching ratio
lepton: flavor: universality
B+: leptonic decay
electron
muon
tau: leptonic decay
D*(2010)
BELLE
decay modes
B0: hadronic decay
B-: hadronic decay
KEK-B
experimental results
anti-B --&gt; D*(2010) tau- antineutrino/tau
anti-B --&gt; D*(2010) electron antineutrino/e
anti-B --&gt; D*(2010) muon- antineutrino/mu

description: The ratio of branching fractions $R(D^{*}) = \mathcal{B}(\overline{B} \rightarrow D^{*} \tau^{-} \overline{\nu}_{\tau})$/$\mathcal{B} (\overline{B} \rightarrow D^{*} \ell^{-} \overline{\nu}_{\ell})$, where $\ell$ is an electron or muon, is measured using a Belle~II data sample with an integrated luminosity of $189~\mathrm{fb}^{-1}$ at the SuperKEKB asymmetric-energy $e^{+} e^{-}$ collider. Data is collected at the $\Upsilon(\mathrm{4S})$ resonance, and one $B$ meson in the $\Upsilon(\mathrm{4S})\rightarrow B\overline{B}$ decay is fully reconstructed in hadronic decay modes. The accompanying signal $B$ meson is reconstructed as $\overline{B}\rightarrow D^{*} \tau^{-}\overline{\nu}_{\tau}$ using leptonic $\tau$ decays. The normalization decay, $\overline{B}\rightarrow D^{*} \ell^{-} \overline{\nu}_{\ell}$, where $\ell$ is an electron or muon, produces the same observable final state particles. The ratio of branching fractions is extracted in a simultaneous fit to two signal-discriminating variables in both channels and yields $R(D^{*}) = 0.262~_{-0.039}^{+0.041}(\mathrm{stat})~_{-0.032}^{+0.035}(\mathrm{syst})$. This result is consistent with the current world average and with standard model predictions.