New precise determination of the τ lepton mass at KEDR detector

03 medical and health sciences 0302 clinical medicine 0103 physical sciences 01 natural sciences High Energy Physics - Experiment
DOI: 10.1016/j.nuclphysbps.2007.02.104 Publication Date: 2007-06-26T11:18:32Z
ABSTRACT
Comment: 6 pages, 8 figures; The 9th International Workshop on Tau-Lepton Physics, Tau06<br/>The status of the experiment on the precise $\tau$ lepton mass measurement running at the VEPP-4M collider with the KEDR detector is reported. The mass value is evaluated from the $\tau^+\tau^-$ cross section behaviour around the production threshold. The preliminary result based on 6.7 pb$^{-1}$ of data is $m_{\tau}=1776.80^{+0.25}_{-0.23} \pm 0.15$ MeV. Using 0.8 pb$^{-1}$ of data collected at the $\psi'$ peak the preliminary result is also obtained: $\Gamma_{ee}B_{\tau\tau}(\psi') = 7.2 \pm 2.1$ eV.<br/>
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