PHYSICAL REVIEW D 107, L091102 (2023)

ISSN: 2470-0029, SCIE

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

The Belle II collaboration (F. Abudin´en, ..., N. Anh Ky, ...)

We measure the B0 lifetime and flavor-oscillation frequency using B0 → DðÞ−πþ decays collected by the Belle II experiment in asymmetric-energy eþe− collisions produced by the SuperKEKB collider operating at the ϒð4SÞ 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 fb−1, are τB0 ¼ ð1.499  0.013  0.008Þ ps, Δmd ¼ ð0.516  0.008  0.005Þ ps−1, where the first uncertainties are statistical and the second are systematic. These results are consistent with the world-average values.

DOI: DOI: 10.1103/PhysRevD.107.L091102