Determination of $|V_{ub}|$ from simultaneous measurements of untagged $B^0\to\pi^- \ell^+ \nu_{\ell}$ and $B^+\to\rho^0 \ell^+\nu_{\ell}$ decays
Creators: name: Adachi, I.
name: Aggarwal, L.
name: Aihara, H.
name: Akopov, N.
name: Aloisio, A.
name: Althubiti, N.
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.
name: Baur, A.
name: Beaubien, A.
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: Biswas, D.
name: Bobrov, A.
name: Bodrov, D.
name: Bolz, A.
name: Borah, J.
name: Boschetti, A.
name: Bozek, A.
name: Bračko, M.
name: Branchini, P.
name: Briere, R. A.
name: Browder, T. E.
name: Budano, A.
name: Bussino, S.
name: Campagna, Q.
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: Cheon, B. G.
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: Corona, L.
name: Cui, J. X.
name: Dattola, F.
name: De La Cruz-Burelo, E.
name: De La Motte, S. A.
name: De Nardo, G.
name: De Nuccio, M.
name: De Pietro, G.
name: de Sangro, R.
name: Destefanis, M.
name: Dey, S.
name: Dhamija, R.
name: Di Canto, A.
name: Di Capua, F.
name: Dingfelder, J.
name: Doležal, Z.
name: Domínguez Jiménez, I.
name: Dong, T. V.
name: Dorigo, M.
name: Dorner, D.
name: Dort, K.
name: Dossett, D.
name: Dreyer, S.
name: Dubey, S.
name: Dugic, K.
name: Dujany, G.
name: Ecker, P.
name: Eliachevitch, M.
name: Feichtinger, P.
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name: Ghosh, D.
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name: Giakoustidis, G.
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name: Giri, A.
name: Glazov, A.
name: Gobbo, B.
name: Godang, R.
name: Gogota, O.
name: Goldenzweig, P.
name: Granderath, S.
name: Greenwald, D.
name: Gruberová, Z.
name: Gu, T.
name: Gudkova, K.
name: Haide, I.
name: Halder, S.
name: Han, Y.
name: Hara, 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: Hsu, C.-L.
name: Humair, T.
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name: Kawasaki, T.
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name: Kim, D. Y.
name: Kim, K.-H.
name: Kim, Y.-K.
name: Kindo, H.
name: Kinoshita, K.
name: Kodyš, P.
name: Koga, T.
name: Kohani, S.
name: Kojima, K.
name: Konno, T.
name: Korobov, A.
name: Korpar, S.
name: Kovalenko, E.
name: Kowalewski, R.
name: Križan, P.
name: Krokovny, P.
name: Kuhr, T.
name: Kulii, Y.
name: Kumar, J.
name: Kumar, M.
name: Kumar, R.
name: Kumara, K.
name: Kunigo, T.
name: Kuzmin, A.
name: Kwon, Y.-J.
name: Lacaprara, S.
name: Lalwani, K.
name: Lam, T.
name: Lanceri, L.
name: Lange, J. S.
name: Laurenza, M.
name: Lautenbach, K.
name: Leboucher, R.
name: Le Diberder, F. R.
name: Lee, M. J.
name: Leo, P.
name: Lemettais, C.
name: Levit, D.
name: Lewis, P. M.
name: Li, L. K.
name: Li, S. X.
name: Li, Y.
name: Li, Y. B.
name: Libby, J.
name: Liptak, Z.
name: Liu, M. H.
name: Liu, Q. Y.
name: Liu, Z. Q.
name: Liventsev, D.
name: Longo, S.
name: Lueck, T.
name: Lyu, C.
name: Ma, Y.
name: Maggiora, M.
name: Maharana, S. P.
name: Maiti, R.
name: Maity, S.
name: Mancinelli, G.
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name: Mehta, R.
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name: Merola, M.
name: Metzner, F.
name: Miller, C.
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name: Mitra, S.
name: Miyabayashi, K.
name: Mizuk, R.
name: Mohanty, G. B.
name: Mondal, S.
name: Moneta, S.
name: Moser, H.-G.
name: Mrvar, M.
name: Mussa, R.
name: Nakamura, I.
name: Nakao, M.
name: Nakazawa, Y.
name: Narimani Charan, A.
name: Naruki, M.
name: Narwal, D.
name: Natkaniec, Z.
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name: Pedlar, T. K.
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name: Pestotnik, R.
name: Piccolo, M.
name: Piilonen, L. E.
name: Pinna Angioni, G.
name: Podesta-Lerma, P. L. M.
name: Podobnik, T.
name: Pokharel, S.
name: Praz, C.
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name: Stavroulakis, P.
name: Stefkova, S.
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name: Sumihama, M.
name: Sumisawa, K.
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name: Suwonjandee, N.
name: Svidras, H.
name: Takahashi, M.
name: Takizawa, M.
name: Tamponi, U.
name: Tanaka, S.
name: Tanida, K.
name: Tenchini, F.
name: Thaller, A.
name: Tittel, O.
name: Tiwary, R.
name: Tonelli, D.
name: Torassa, E.
name: Trabelsi, K.
name: Uchida, M.
name: Ueda, I.
name: Uglov, T.
name: Unger, K.
name: Unno, Y.
name: Uno, K.
name: Uno, S.
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: Vossen, A.
name: Wach, B.
name: Wakai, M.
name: Wallner, S.
name: Wang, E.
name: Wang, M.-Z.
name: Wang, Z.
name: Warburton, A.
name: Watanabe, M.
name: Watanuki, S.
name: Wessel, C.
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: Yook, Y. M.
name: Yoshihara, K.
name: Yuan, C. Z.
name: Zani, L.
name: Zeng, F.
name: Zhang, B.
name: Zhilich, V.
name: Zhou, J. S.
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: branching ratio
meson
semileptonic decay
BELLE
KEK-B
lattice field theory
nonperturbative
statistical
electron positron
momentum transfer

description: We present a measurement of $|V_{ub}|$ from a simultaneous study of the charmless semileptonic decays $B^0\to\pi^- \ell^+ \nu_{\ell}$ and $B^+\to\rho^0 \ell^+\nu_{\ell}$, where $\ell = e, \mu$. This measurement uses a data sample of 387 million $B\overline{B}$ meson pairs recorded by the Belle~II detector at the SuperKEKB electron-positron collider between 2019 and 2022. The two decays are reconstructed without identifying the partner $B$ mesons. We simultaneously measure the differential branching fractions of $B^0\to\pi^- \ell^+ \nu_{\ell}$ and $B^+\to\rho^0 \ell^+\nu_{\ell}$ decays as functions of $q^2$ (momentum transfer squared). From these, we obtain total branching fractions $B(B^0\to\pi^- \ell^+ \nu_{\ell}) = (1.516 \pm 0.042 (\mathrm{stat}) \pm 0.059 (\mathrm{syst})) \times 10^{-4}$ and $B(B^+\to\rho^0 \ell^+\nu_{\ell}) = (1.625 \pm 0.079 (\mathrm{stat}) \pm 0.180 (\mathrm{syst})) \times 10^{-4}$. By fitting the measured $B^0\to\pi^- \ell^+ \nu_{\ell}$ partial branching fractions as functions of $q^2$, together with constraints on the non-perturbative hadronic contribution from lattice QCD calculations, we obtain $|V_{ub}|$ = $(3.93 \pm 0.09 \pm 0.13 \pm 0.19) \times 10^{-3}$. Here, the first uncertainty is statistical, the second is systematic, and the third is theoretical.