학술논문
Measurement of the τ lepton mass at the KEDR detector.
Document Type
Article
Author
Anashin, V. V.; Aulchenko, V. M.; Baldin, E. M.; Barladyan, A. K.; Barnyakov, A. Yu.; Barnyakov, M. Yu.; Baru, S. E.; Bedny, I. V.; Beloborodova, O. L.; Blinov, A. E.; Blinov, V. E.; Bobrov, A. B.; Bobrovnikov, V. S.; Bogomyagkov, A. V.; Bondar, A. E.; Bondarev, D. V.; Buzykaev, A. R.; Cherepanov, V. P.; Eidelman, S. I.; Glukhovchenko, Yu. M.
Source
Subject
*MASS measurement
*LEPTONS (Nuclear physics)
*COLLIDERS (Nuclear physics)
*NUCLEAR cross sections
*DETECTORS
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Language
ISSN
0021-3640
Abstract
A precise τ lepton mass measurement performed at the VEPP-4M collider with the KEDR detector is reported. The mass value is evaluated from the τ+τ− cross section behavior around the production threshold. The result based on 6.7 pb−1 of data is m τ = 1776.81 ± 0.15 MeV. Using 0.8 pb−1 of data collected at the ψ′ peak, we have also determined that Γ ee B ττ(ψ′) = 9.0 ± 2.6 eV. [ABSTRACT FROM AUTHOR]