Measurement of the τ lepton mass at the KEDR detector |
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Institution: | (1) Budker Institute of Nuclear Physics, Russian Academy of Sciences, Novosibirsk, 630090, Russia |
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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
−0.23
+0.25
± 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.
The text was submitted by the authors in English. |
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Keywords: | |
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