Measurement of the branching fraction of the decay $B^{\mathstrut -} \to D^0\rho(770)^{\mathstrut -}$ at Belle II

Abstract We measure the branching fraction of the decay $B^- \to D^0 ρ(770)^-$ using data collected with the Belle II detector. The data contain 387 million $B\overline{B}$ pairs produced in $e^+e^-$ collisions at the $Υ(4S)$ resonance. We reconstruct $8360\pm 180$ decays from an analysis of the distributions of the $B^-$ energy and the $ρ(770)^-$ 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.
Tags
Working group B Hadronic
Principal authors @  Mirco Dorigo, Riccardo Manfredi, Olga Werbycka
Reference Phys.Rev.D 109, L111103 (2024), DOI: 10.1103/PhysRevD.109.L111103
Document BELLE2-PUB-PH-2024-055
Links arXiv:2404.10874, Inspire, PRD
Bibtex 
@article{Belle-II:2024vfw,
    author = "Adachi, I. and others",
    collaboration = "Belle-II",
    title = "{Measurement of the branching fraction of the decay B-{\textrightarrow}D0{\ensuremath{\rho}}(770)- at Belle II}",
    eprint = "2404.10874",
    archivePrefix = "arXiv",
    primaryClass = "hep-ex",
    reportNumber = "Belle II Preprint 2024-011, KEK Preprint 2024-4",
    doi = "10.1103/PhysRevD.109.L111103",
    journal = "Phys. Rev. D",
    volume = "109",
    number = "11",
    pages = "L111103",
    year = "2024"
}