Precise Measurement ofBMeson Lifetimes with Hadronic Decay Final States

Abstract

The lifetimes of the ${\overline{B}}^0$ and $B^{-}$ mesons are extracted from $29.1{\mathrm{fb}}^{-1\mathrm{}}$ of data collected with the Belle detector at the KEK $B$ factory. A fit to the decay length differences of neutral and charged $B$ meson pairs, measured in events where one of the $B$ mesons is fully reconstructed in several hadronic modes, yields ${\tau }_{{\overline{B}}^0}=1.554\mathrm{}\pm 0.030\left(\mathrm{stat}\right)\pm 0.019\left(\mathrm{syst}\right)\mathrm{ps}$, ${\tau }_{B^{-}}=1.695\mathrm{}\pm 0.026\left(\mathrm{stat}\right)\pm 0.015\left(\mathrm{syst}\right)\mathrm{ps}$, and ${\tau }_{B^{-}}/{\tau }_{{\overline{B}}^0}=1.091\mathrm{}\pm 0.023\left(\mathrm{stat}\right)\pm 0.014\left(\mathrm{syst}\right)$.