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New precise determination of the tau lepton mass at KEDR detector

Collaboration
•
Nov, 2006
6 pages
Published in:
  • Nucl.Phys.B Proc.Suppl. 169 (2007) 125-131
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Abstract: (arXiv)
The status of the experiment on the precise τ\tau lepton mass measurement running at the VEPP-4M collider with the KEDR detector is reported. The mass value is evaluated from the τ+τ−\tau^+\tau^- cross section behaviour around the production threshold. The preliminary result based on 6.7 pb−1^{-1} of data is mτ=1776.80−0.23+0.25±0.15m_{\tau}=1776.80^{+0.25}_{-0.23} \pm 0.15 MeV. Using 0.8 pb−1^{-1} of data collected at the ψ′\psi' peak the preliminary result is also obtained: ΓeeBττ(ψ′)=7.2±2.1\Gamma_{ee}B_{\tau\tau}(\psi') = 7.2 \pm 2.1 eV.