Measurement of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="italic">B</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="italic">B</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>Meson Lifetimes with Fully Reconstructed Hadronic Final States

The ${B}^{0}$ and ${B}^{+}$ meson lifetimes have been measured in ${e}^{+}{e}^{\ensuremath{-}}$ annihilation data collected in 1999 and 2000 with the BABAR detector at center-of-mass energies near the $\ensuremath{\Upsilon}(4S)$ resonance. Events are selected in which one B meson is fully reconstructed in a hadronic final state while the second B meson is reconstructed inclusively. A combined fit to the ${B}^{0}$ and the ${B}^{+}$ decay time difference distributions yields ${\ensuremath{\tau}}_{{B}^{0}}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1.546\ifmmode\pm\else\textpm\fi{}0.032(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.022(\mathrm{syst})\phantom{\rule{0ex}{0ex}}\mathrm{ps}$, ${\ensuremath{\tau}}_{{B}^{+}}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1.673\ifmmode\pm\else\textpm\fi{}0.032(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.023(\mathrm{syst})\phantom{\rule{0ex}{0ex}}\mathrm{ps}$, and ${\ensuremath{\tau}}_{{B}^{+}}/{\ensuremath{\tau}}_{{B}^{0}}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1.082\ifmmode\pm\else\textpm\fi{}0.026(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.012(\mathrm{syst})$.

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