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 $B^0\to D^{(\ast )-}{\pi }^{+}$ decays collected by the Belle II experiment in asymmetric-energy $e^{+}{e}^{-}$ collisions produced by the SuperKEKB collider operating at the ${\rm Y}(4S)$ 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 ${\tau }_{B^0}=1.499\pm 0.013\pm 0.008\text{ps}$, $\Delta m_d=0.516\pm 0.008\pm 0.005{\text{ps}}^{-1}$, where the first uncertainties are statistical and the second are systematic. These results are consistent with the world-average values.

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Cited by in corpus (8)

• New graph-neural-network flavor tagger for Belle II and measurement of $\sin 2{\varphi }_1$ in $B^0\to J/\psi K_{\text{S}}^0$ decays
• Measurement of branching fractions and direct $CP$ asymmetries for $B\to K\pi$ and $B\to \pi \pi$ decays at Belle II
• Measurement of $CP$ asymmetries in $B^0\to \varphi K_S^0$ decays with Belle II
• Measurement of $CP$ asymmetries in $B^0\to K_S^0{\pi }^0\gamma$ decays at Belle II
• Precision measurement of the $B^0$ meson lifetime using $B^0\to J/\psi K^{\ast 0}$ decays with the ATLAS detector
• Measurement of $CP$ asymmetries in $B^0\to {\eta }^{\prime }{K}_s^0$ decays at Belle II
• Measurement of the branching fraction, polarization, and time-dependent $CP$ asymmetry in $B^0\to {\rho }^{+}{\rho }^{-}$ decays and constraint on the CKM angle ${\varphi }_2$
• Lepton flavor violating top quark FCNC processes at the $\mu$TRISTAN