Measurement of the Ratio of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>B</mml:mi><mml:mo>+</mml:mo></mml:msup></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>B</mml:mi><mml:mn>0</mml:mn></mml:msup></mml:math>Meson Lifetimes

The ratio of the ${B}^{+}$ and ${B}^{0}$ meson lifetimes was measured using data collected in 2002--2004 by the D0 experiment in Run II of the Fermilab Tevatron Collider. These mesons were reconstructed in $B\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}\ensuremath{\nu}{D}^{*\ensuremath{-}}X$ decays, which are dominated by ${B}^{0}$ and $B\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}\ensuremath{\nu}{\overline{D}}^{0}X$ decays, which are dominated by ${B}^{+}$. The ratio of lifetimes is measured to be ${\ensuremath{\tau}}^{+}/{\ensuremath{\tau}}^{0}=1.080\ifmmode\pm\else\textpm\fi{}0.016(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.014(\mathrm{syst})$.

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