New precise determination of the τlepton mass at KEDR detector

Details New precise determination of the τlepton mass at KEDR detector New precise determination of the τlepton mass at KEDR detector

2006-11-27

arxiv.org/abs/hep-ex/0611046v1

Nucl.Phys.Proc.Suppl.169:125-131,2007

Physics

High Energy Physics

High Energy Physics - Experiment

6 pages, 8 figures; The 9th International Workshop on Tau-Lepton Physics, Tau06

Scientific paper

10.1016/j.nuclphysbps.2007.02.10

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.

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