Speaker
Dr
Ivan Nikolaev
(Budker Insitute of Nuclear Physics)
Description
We had performed a tau threshold scan with $\int L \approx 130~pb^{-1}$ for a
new tau-lepton mass measurement with BES-III detector in 2018. The beam energy
is determined by laser backscattering and high-purity germanium detector which
is calibrated by $\gamma$-sources. We have done $J/\psi$ and $\psi(2S)$-meson
scans to examine beam energy measurement system. In this report we present
preliminary result of the tau mass measurement.
Primary author
Dr
Ivan Nikolaev
(Budker Insitute of Nuclear Physics)
