Measurement of the B⁰ lifetime and flavor-oscillation frequency using hadronic decays reconstructed in 2019-2021 Belle II data

2023/02/24 by Belle II Collaboration, Abudinén, F., Adachi, I. +393
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.2302.12791

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 τ_B⁰ = 1.499±0.013±0.008 ps, Δm_d = 0.516±0.008±0.005 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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