BELLE2-CONF-PH-2020-003

Measurement of the $B^{0}$ lifetime using fully reconstructed hadronic decays in the 2019 Belle II dataset

Abstract: This document presents the measurement of B 0 meson lifetimes using the 2019 Belle II dataset that corresponds to an integrated luminosity of $8.7 \pm 0.2 fb^{-1}$. Each candidate is fully reconstructed with hadronic decay final states on the signal side, while the rest-of-event technique allows to infer the decay vertex position on the other (tag) side. $B^{0}$ lifetime is extracted from an unbinned maximum likelihood fit to the distribution of the difference between the signal side $B^{0}$ candidate and the tag side decay times. The measured lifetime is $\tau_{B^{0}} = 1.48 \pm 0.28 \pm 0.06$ ps, where the first uncertainty is statistical and the second is systematic.

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