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Final result

Then, combining the single decay mode measurements, we quote the following lifetimes:


\begin{displaymath}
c\tau(B^+) = 498 \pm 8(stat) \pm 4(syst) \mu m, \\
\end{displaymath}


\begin{displaymath}
c\tau(B^0) = 453 \pm 7(stat) \pm 4(syst) \mu m, \\
\end{displaymath}


\begin{displaymath}
c\tau(B_s) = 479 \pm 29(stat) \pm 5(syst) \mu m.
\end{displaymath}

or


\begin{displaymath}
c\tau(B^+) = 1.66 \pm 0.03 (stat) \pm 0.01 (syst) ps,
\end{displaymath}


\begin{displaymath}
c\tau(B^0) = 1.51 \pm 0.02 (stat) \pm 0.01 (syst) ps,
\end{displaymath}


\begin{displaymath}
c\tau(B_s) = 1.60 \pm 0.10 (stat) \pm 0.02 (syst) ps.
\end{displaymath}

The ratio of the lifetimes is found to be:


\begin{displaymath}
c\tau(B^{+})/c\tau(B^{0}) = 1.10 \pm 0.02 (stat) \pm 0.01 (syst),
\end{displaymath}


\begin{displaymath}
c\tau(B_{s})/c\tau(B^{0}) = 1.06 \pm 0.07 (stat) \pm 0.01 (syst),
\end{displaymath}

For comparison, the 2004 Particle Data Group results are:

\begin{displaymath}
c\tau(B^+) = 501 \pm 5 \mu m, \\
\end{displaymath}


\begin{displaymath}
c\tau(B^0) = 461 \pm 4 \mu m, \\
\end{displaymath}


\begin{displaymath}
c\tau(B_s) = 438 \pm 17 \mu m.
\end{displaymath}



Saverio Da Ronco 2005-03-23