Measurement of the $\tau$-lepton lifetime at Belle

Abstract

The lifetime of the $\tau$-lepton is measured using the process $e^{+}{e}^{-}\to {\tau }^{+}{\tau }^{-}$, where both $\tau$-leptons decay to $3\pi {\nu }_{\tau }$. The result for the mean lifetime, based on $711{\mathrm{fb}}^{-1}$ of data collected with the Belle detector at the ${\rm Y}(4S)$ resonance and $60\mathrm{MeV}$ below, is $\tau =(290.17\pm 0.53(stat.)\pm 0.33(syst.))\cdot 10^{-15}\mathrm{s}$. The first measurement of the lifetime difference between ${\tau }^{+}$ and ${\tau }^{-}$ is performed. The upper limit on the relative lifetime difference between positive and negative $\tau$-leptons is $|\Delta \tau |/\tau <7.0\times 10^{-3}$ at 90% CL.

arXiv comment17 pages, 4 figures. Submitted to Phys. Rev. Lett

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