New precise determination of the τ lepton mass at KEDR detector

• DOI: 10.1016/j.nuclphysbps.2007.02.104
• Publication Date: 2007-06-26T11:18:32Z
• Authors: 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
• Keywords: 03 medical and health sciences; 0302 clinical medicine; 0103 physical sciences; 01 natural sciences; High Energy Physics - Experiment

Comment: 6 pages, 8 figures; The 9th International Workshop on Tau-Lepton Physics, Tau06<br/>The status of the experiment on the precise $\tau$ lepton mass measurement running at the VEPP-4M collider with the KEDR detector is reported. The mass value is evaluated from the $\tau^+\tau^-$ cross section behaviour around the production threshold. The preliminary result based on 6.7 pb$^{-1}$ of data is $m_{\tau}=1776.80^{+0.25}_{-0.23} \pm 0.15$ MeV. Using 0.8 pb$^{-1}$ of data collected at the $\psi'$ peak the preliminary result is also obtained: $\Gamma_{ee}B_{\tau\tau}(\psi') = 7.2 \pm 2.1$ eV.<br/>