| Measurement of the τ lepton mass at KEDR detector
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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
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PACS: 13.20.Gd, 14.60.Fg, 29.20.-c, 29.27.Hj
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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 behaviour around the production threshold. The result based on 6.7 pb-1 of data is  MeV. Using 0.8 pb-1 of data collected at the ψ' peak we have also determined  eV.
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