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ISSN - 09205632, Nuclear Physics B - Proceedings Supplements, 2007, vol. 169, p. 125-131

New precise determination of the τ lepton mass at 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.

The status of the experiment on the precise τ lepton mass measurement running 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 preliminary result based on 6.7  pb-1 of data is mτ = 1776.80-0.23 +0.25 ± 0.15  MeV. Using 0.8  pb-1 of data collected at the ψ′ peak the preliminary result is also obtained: Γe e ṡ Bτ τ (ψ′) = 7.2 ± 2.1  eV. © 2007 Elsevier B.V. All rights reserved.