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  • Measurement of the branching fraction of the decay $B^- \to D^0 \rho(770)^-$ at Belle II
    Adachi, I; Aihara, H; Aloisio, A; Asner, D. M; Aushev, V; Babu, V; Bahinipati, S; Bansal, S; Beaubien, A; Bodrov, D; Boschetti, A; Bozek, A; Browder, T. E; Budano, A; Cheema, P; Cho, K; Choi, S. -K; Cui, J. X; De La Cruz-Burelo, E; De Nardo, G; De Nuccio, M; Dhamija, R; Di Capua, F; Dingfelder, J; Dossett, D; Dujany, G; Eliachevitch, M; Fillinger, T; Finocchiaro, G; Fodor, A; Forti, F; Frey, A; Gabrielli, A; Ganiev, E; Giordano, R; Godang, R; Graziani, E; Greenwald, D; Hayasaka, K; Hayashii, H; Hearty, C; Heidelbach, A; Hoek, M; Humair, T; Jin, Y; Junkerkalefeld, H; Kaliyar, A. B; Kang, S; Kiesling, C; Kohani, S; Korpar, S; Kowalewski, R; Krokovny, P; Levit, D; Liu, Q. Y; Masuda, M; Meier, F; Mondal, S; Moneta, S; Mrvar, M; Mussa, R; Natochii, A; Nazaryan, G; Neu, M; Novosel, A; Ogawa, S; Passeri, A; Pestotnik, R; Podobnik, T; Rauls, N; Sanders, D. A; Sandilya, S; Santelj, L; Schnepf, M; Schwanda, C; Selce, A; Serrano, J; Shan, W; Shen, C. P; Soffer, A; Starič, M; Stroili, R; Sutcliffe, W; Tamponi, U; Tanida, K; Tiwary, R; Torassa, E; Ueda, I; Vahsen, S. E; van Tonder, R; Volpe, R; Wakai, M; Watanabe, M; Watanuki, S; Werbycka, O; Yabsley, B. D; Yan, W; Yuan, C. Z; Yusa, Y; Zhou, X. Y

    arXiv (Cornell University), 04/2024
    Journal Article

    PRD 109, 111103 (2024) We measure the branching fraction of the decay $B^- \to D^0 \rho(770)^-$ using data collected with the Belle II detector. The data contain 387 million $B\overline{B}$ pairs produced in $e^+e^-$ collisions at the $\Upsilon(4S)$ resonance. We reconstruct $8360\pm 180$ decays from an analysis of the distributions of the $B^-$ energy and the $\rho(770)^-$ helicity angle. We determine the branching fraction to be $(0.939 \pm 0.021\mathrm{(stat)} \pm 0.050\mathrm{(syst)})\%$, in agreement with previous results. Our measurement improves the relative precision of the world average by more than a factor of two.

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