We measure the B0 lifetime and flavor-oscillation frequency using B0→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 190fb−1, are τB0=1.499±0.013±0.008ps, Δmd=0.516±0.008±0.005ps−1, where the first uncertainties are statistical and the second are systematic. These results are consistent with the world-average values.
Measurement of the B0 lifetime and flavor-oscillation frequency using hadronic decays reconstructed in 2019–2021 Belle II data
Bettarini, S.;Casarosa, G.;Corona, L.;Forti, F.;Massaccesi, L.;Rizzo, G.;Tenchini, F.;
2023-01-01
Abstract
We measure the B0 lifetime and flavor-oscillation frequency using B0→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 190fb−1, are τB0=1.499±0.013±0.008ps, Δmd=0.516±0.008±0.005ps−1, where the first uncertainties are statistical and the second are systematic. These results are consistent with the world-average values.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.