Measurement of the $B^0$ lifetime and flavor-oscillation frequency using hadronic decays reconstructed in 2019-2021 Belle II data

Abstract We measure the $B^0$ lifetime and flavor-oscillation frequency using $B^0\to D^{(*)-}π^+$ decays collected by the Belle II experiment in asymmetric-energy $e^+e^-$ collisions produced by the SuperKEKB collider operating at the $Υ(4S)$ resonance. We fit the decay-time distribution of signal decays, where the initial flavor is determined by identifying the flavor of the other $B$ meson in the event. The results, based on $33000$ signal decays reconstructed in a data sample corresponding to ${190}\text{fb}^{-1}$, are $τ_{B^0} = {1.499}\pm{0.013}\pm{0.008}\;\text{ps}$, $Δm_d = {0.516}\pm{0.008}\pm{0.005}\;\text{ps}^{-1}$, where the first uncertainties are statistical and the second are systematic. These results are consistent with the world-average values.
Tags
Working group Time Dependent CP Violation
Principal authors @  Vladimir Chekelian, Thibaud Humair, Jakub Kandra, Caspar Schmitt, Justin Skorupa, Radek Zlebcik
Reference Phys.Rev.D 107, L091102 (2023), DOI: 10.1103/PhysRevD.107.L091102
Document BELLE2-PUB-PH-2022-003
Links arXiv:2302.12791, Inspire, PRD
Bibtex 
@article{Belle-II:2023bps,
    author = "Abudin{\'e}n, F. and others",
    collaboration = "Belle-II",
    title = "{Measurement of the B0 lifetime and flavor-oscillation frequency using hadronic decays reconstructed in 2019{\textendash}2021 Belle II data}",
    eprint = "2302.12791",
    archivePrefix = "arXiv",
    primaryClass = "hep-ex",
    reportNumber = "Belle II Preprint 2023-001, KEK Preprint 2022-56",
    doi = "10.1103/PhysRevD.107.L091102",
    journal = "Phys. Rev. D",
    volume = "107",
    number = "9",
    pages = "L091102",
    year = "2023"
}