Tau mass measurement at BES-III
Budker Institute of Nuclear Physics, Novosibirsk, Russia
2 Novosibirsk State University, Novosibirsk, Russia
3 Institute of High Energy Physics, Beijing, China
4 University of Chinese Academy of Sciences, Beijing, China
* e-mail: I.B.Nikolaev@inp.nsk.su
Published online: 17 June 2019
A scan of the threshold region of the process e+ e−→ τ+τ− with integrated luminosity about 140 pb−1 was performed with the BES-III detector at the BEPC-II collider in order to measure the τ-lepton mass. The beam energy was determined by the Compton backscattering method. To verify the measurement accuracy scans of the J/ψ and ψ′ resonances were performed.
© The Authors, published by EDP Sciences, 2019
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