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ISSN - 00213640, EISSN - 10906487, JETP Letters, 2007, vol. 85, p. 347-352

Measurement of the τ lepton mass at the KEDR detector

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., Gulevich V. V., Karnaev S. E., Karpov G. V., Karpov S. V., Kiselev V. A., Kononov S. A., Kotov K. Yu, Kravchenko E. A., Kremyanskaya E. V., Kulikov V. F., Kurkin G. Ya, Kuper E. A., Levichev E. B., Maksimov D. A., Malyshev V. M., Maslennikov A. L., Medvedko A. S., Meshkov O. I., Mishnev S. E., Morozov I. I., Muchnoi N. Yu, Neufeld V. V., Nikitin S. A., Nikolaev I. B., Onuchin A. P., Oreshkin S. B., Orlov I. O., Osipov A. A., Peleganchuk S. V., Petrosyan S. S., Pivovarov S. G., Piminov P. A., Petrov V. V., Poluektov A. O., Pospelov G. E., Prisekin V. G., Ruban A. A., Sandyrev V. K., Savinov G. A., Shamov A. G., Shatilov D. N., Shubin E. I., Shwartz B. A., Sidorov V. A., Simonov E. A., Sinyatkin S. V., Skovpen Yu I., Skrinsky A. N., Smaluk V. V., Soukharev A. M., Struchalin M. V., Talyshev A. A., Tayursky V. A., Telnov V. I., Tikhonov Yu A., Todyshev K. Yu, Tumaikin G. M., Usov Yu V., Vorobiov A. I., Yushkov A. N., Zhilich V. N., Zhuravlev A. N.

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. © Nauka/Interperiodica 2007.