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VOLUME 85 | ISSUE 8 | PAGE 429
Measurement of the τ lepton mass at KEDR detector
V. V. Anashin, V. M. Aulchenko, E. M. Baldin, A. K. Barladyan, A. Yu. Barnyakov, M. Yu. Barnyakov, S. E. Baru, I. V. Bedny, O. L. Beloborodova, A. E. Blinov, V. E. Blinov, A. B. Bobrov, V. S. Bobrovnikov, A. V. Bogomyagkov, A. E. Bondar, D. V. Bondarev, A. R. Buzykaev, V. P. Cherepanov, S. I. Eidelman, Yu. M. Glukhovchenko, V. V. Gulevich, S. E. Karnaev, G. V. Karpov, S. V. Karpov, V. A. Kiselev, S. A. Kononov, K. Yu. Kotov, E. A. Kravchenko, E. V. Kremyanskaya, V. F. Kulikov, G. Ya. Kurkin, E. A. Kuper, E. B. Levichev, D. A. Maksimov, V. M. Malyshev, A. L. Maslennikov, A. S. Medvedko, O. I. Meshkov, S. E. Mishnev, I. I. Morozov, N. Yu. Muchnoi, V. V. Neufeld, S. A. Nikitin, I. B. Nikolaev, A. P. Onuchin, S. B. Oreshkin, I. O. Orlov, A. A. Osipov, S. V. Peleganchuk, S. S. Petrosyan, S. G. Pivovarov, P. A. Piminov, V. V. Petrov, A. O. Poluektov, G. E. Pospelov, V. G. Prisekin, A. A. Ruban, V. K. Sandyrev, G. A. Savinov, A. G. Shamov, D. N. Shatilov, E. I. Shubin, B. A. Shwartz, V. A. Sidorov, E. A. Simonov, S. V. Sinyatkin, Yu. I. Skovpen, A. N. Skrinsky, V. V. Smaluk, A. M. Soukharev, M. V. Struchalin, A. A. Talyshev, V. A. Tayursky, V. I. Telnov, Yu. A. Tikhonov, K. Yu. Todyshev, G. M. Tumaikin, Yu. V. Usov, A. I. Vorobiov, A. N. Yushkov, V. N. Zhilich, A. N. Zhuravlev
Budker Institute of Nuclear Physics RAS, 630090 Novosibirsk, Russia

PACS: 13.20.Gd, 14.60.Fg, 29.20.-c, 29.27.Hj
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 behaviour around the production threshold. The result based on 6.7 pb-1 of data is m_{\tau} = 1776.81^{+0.25}_{-0.23} \pm 0.15 MeV. Using 0.8 pb-1 of data collected at the ψ' peak we have also determined \Gamma_{ee}\!\cdot\!B_{\tau\tau} (\psi') = 9.0 \pm 2.6 eV.


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