Abstract
The status of the experiment on the precise τ lepton mass measurement running at the VEPP-4M collider with the KEDR detector is reported. The mass value is evaluated from the τ + τ − cross section behaviour around the production threshold. The preliminary result based on 6.7 pb −1 of data is m τ = 1776.80 −0.23 +0.25 ± 0.15 MeV . Using 0.8 pb −1 of data collected at the ψ ′ peak the preliminary result is also obtained: Γ e e ⋅ B τ τ ( ψ ′ ) = 7.2 ± 2.1 eV .
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