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1. Precise measurement of Ruds and R between 1.84 and 3.72 GeV at the KEDR detector

Author

V.V. Anashin, O.V. Anchugov, V.M. Aulchenko, E.M. Baldin, G.N. Baranov, A.K. Barladyan, A.Yu. Barnyakov, M.Yu. Barnyakov, S.E. Baru, I.Yu. Basok, A.M. Batrakov, E.A. Bekhtenev, A.E. Blinov, V.E. Blinov, A.V. Bobrov, V.S. Bobrovnikov, A.V. Bogomyagkov, A.E. Bondar, A.R. Buzykaev, P.B. Cheblakov, V.L. Dorohov, S.I. Eidelman, D.N. Grigoriev, S.A. Glukhov, V.V. Kaminskiy, S.E. Karnaev, G.V. Karpov, S.V. Karpov, K.Yu. Karukina, D.P. Kashtankin, P.V. Kasyanenko, T.A. Kharlamova, V.A. Kiselev, V.V. Kolmogorov, S.A. Kononov, K.Yu. Kotov, A.A. Krasnov, E.A. Kravchenko, V.N. Kudryavtsev, V.F. Kulikov, G.Ya. Kurkin, I.A. Kuyanov, E.B. Levichev, D.A. Maksimov, V.M. Malyshev, A.L. Maslennikov, O.I. Meshkov, S.I. Mishnev, I.A. Morozov, I.I. Morozov, S.A. Nikitin, I.B. Nikolaev, I.N. Okunev, A.P. Onuchin, S.B. Oreshkin, A.A. Osipov, I.V. Ovtin, S.V. Peleganchuk, S.G. Pivovarov, P.A. Piminov, V.V. Petrov, V.G. Prisekin, O.L. Rezanova, A.A. Ruban, G.A. Savinov, A.G. Shamov, D.N. Shatilov, D.A. Shvedov, B.A. Shwartz, E.A. Simonov, S.V. Sinyatkin, A.N. Skrinsky, A.V. Sokolov, D.P. Sukhanov, A.M. Sukharev, E.V. Starostina, A.A. Talyshev, V.A. Tayursky, V.I. Telnov, Yu.A. Tikhonov, K.Yu. Todyshev, A.G. Tribendis, G.M. Tumaikin, Yu.V. Usov, A.I. Vorobiov, V.N. Zhilich, A.A. Zhukov, V.V. Zhulanov, and A.N. Zhuravlev

Subjects
Physics, QC1-999
Abstract

The present work continues a series of the KEDR measurements of the R value that started in 2010 at the VEPP-4M e+e− collider. By combining new data with our previous results in this energy range we measured the values of Ruds and R at nine center-of-mass energies between 3.08 and 3.72 GeV. The total accuracy is about or better than 2.6% at most of energy points with a systematic uncertainty of about 1.9%. Together with the previous precise R measurement at KEDR in the energy range 1.84–3.05 GeV, it constitutes the most detailed high-precision R measurement near the charmonium production threshold.

Published
2019
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2. Measurement of Γee×Bμμ for ψ(2S) meson

Author

V.V. Anashin, O.V. Anchugov, V.M. Aulchenko, E.M. Baldin, G.N. Baranov, A.K. Barladyan, A.Yu. Barnyakov, M.Yu. Barnyakov, S.E. Baru, I.Yu. Basok, A.M. Batrakov, E.A. Bekhtenev, A.E. Blinov, V.E. Blinov, A.V. Bobrov, V.S. Bobrovnikov, A.V. Bogomyagkov, A.E. Bondar, A.R. Buzykaev, P.B. Cheblakov, V.L. Dorohov, S.I. Eidelman, D.N. Grigoriev, S.A. Glukhov, S.E. Karnaev, G.V. Karpov, S.V. Karpov, K.Yu. Karukina, D.P. Kashtankin, T.A. Kharlamova, V.A. Kiselev, V.V. Kolmogorov, S.A. Kononov, K.Yu. Kotov, A.A. Krasnov, E.A. Kravchenko, V.N. Kudryavtsev, V.F. Kulikov, G.Ya. Kurkin, I.A. Kuyanov, E.A. Kuper, E.B. Levichev, D.A. Maksimov, V.M. Malyshev, A.L. Maslennikov, O.I. Meshkov, S.I. Mishnev, I.A. Morozov, I.I. Morozov, N.Yu. Muchnoi, S.A. Nikitin, I.B. Nikolaev, I.N. Okunev, A.P. Onuchin, S.B. Oreshkin, A.A. Osipov, I.V. Ovtin, S.V. Peleganchuk, S.G. Pivovarov, P.A. Piminov, V.V. Petrov, V.G. Prisekin, O.L. Rezanova, A.A. Ruban, G.A. Savinov, A.G. Shamov, D.N. Shatilov, D.A. Shvedov, B.A. Shwartz, E.A. Simonov, S.V. Sinyatkin, A.N. Skrinsky, A.V. Sokolov, D.P. Sukhanov, A.M. Sukharev, E.V. Starostina, A.A. Talyshev, V.A. Tayursky, V.I. Telnov, Yu.A. Tikhonov, K.Yu. Todyshev, A.G. Tribendis, G.M. Tumaikin, Yu.V. Usov, A.I. Vorobiov, V.N. Zhilich, A.A. Zhukov, V.V. Zhulanov, and A.N. Zhuravlev

Subjects
Physics, QC1-999
Abstract

The product of the electronic width of the ψ(2S) meson and the branching fraction of its decay to the muon pair was measured in the e+e−→ψ(2S)→μ+μ− process using nine data sets corresponding to an integrated luminosity of about 6.5 pb−1 collected with the KEDR detector at the VEPP-4M electron–positron collider:Γee×Bμμ=19.3±0.3±0.5eV. Adding the previous KEDR results on hadronic and leptonic channels, the values of the ψ(2S) electronic width were obtained under two assumptions: either with the assumption of lepton universalityΓee=2.279±0.015±0.042keV or without it, summing up hadronic and three independent leptonic channelsΓee=2.282±0.015±0.042keV. Keywords: ψ(2S) meson, Leptonic width, Branching fraction

Published
2018
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3. Measurement of R between 1.84 and 3.05 GeV at the KEDR detector

Author

V.V. Anashin, V.M. Aulchenko, E.M. Baldin, A.K. Barladyan, A.Yu. Barnyakov, M.Yu. Barnyakov, S.E. Baru, I.Yu. Basok, A.M. Batrakov, A.E. Blinov, V.E. Blinov, A.V. Bobrov, V.S. Bobrovnikov, A.V. Bogomyagkov, A.E. Bondar, A.R. Buzykaev, S.I. Eidelman, D.N. Grigoriev, Yu.M. Glukhovchenko, S.E. Karnaev, G.V. Karpov, S.V. Karpov, P.V. Kasyanenko, T.A. Kharlamova, V.A. Kiselev, V.V. Kolmogorov, S.A. Kononov, K.Yu. Kotov, E.A. Kravchenko, V.N. Kudryavtsev, V.F. Kulikov, G.Ya. Kurkin, I.A. Kuyanov, E.A. Kuper, E.B. Levichev, D.A. Maksimov, V.M. Malyshev, A.L. Maslennikov, O.I. Meshkov, S.I. Mishnev, I.I. Morozov, N.Yu. Muchnoi, V.V. Neufeld, S.A. Nikitin, I.B. Nikolaev, I.N. Okunev, A.P. Onuchin, S.B. Oreshkin, A.A. Osipov, I.V. Ovtin, S.V. Peleganchuk, S.G. Pivovarov, P.A. Piminov, V.V. Petrov, V.G. Prisekin, O.L. Rezanova, A.A. Ruban, V.K. Sandyrev, G.A. Savinov, A.G. Shamov, D.N. Shatilov, B.A. Shwartz, E.A. Simonov, S.V. Sinyatkin, A.N. Skrinsky, A.V. Sokolov, A.M. Sukharev, E.V. Starostina, A.A. Talyshev, V.A. Tayursky, V.I. Telnov, Yu.A. Tikhonov, K.Yu. Todyshev, G.M. Tumaikin, Yu.V. Usov, A.I. Vorobiov, V.N. Zhilich, V.V. Zhulanov, and A.N. Zhuravlev

Subjects
Physics, QC1-999
Abstract

Using the KEDR detector at the VEPP-4M e+e− collider, we have determined the values of R at thirteen points of the center-of-mass energy between 1.84 and 3.05 GeV. The achieved accuracy is about or better than 3.9% at most of the energy points with a systematic uncertainty less than 2.4%.

Published
2017
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4. Measurement of Ruds and R between 3.12 and 3.72 GeV at the KEDR detector

Author

V.V. Anashin, V.M. Aulchenko, E.M. Baldin, A.K. Barladyan, A.Yu. Barnyakov, M.Yu. Barnyakov, S.E. Baru, I.Yu. Basok, A.M. Batrakov, A.E. Blinov, V.E. Blinov, A.V. Bobrov, V.S. Bobrovnikov, A.V. Bogomyagkov, A.E. Bondar, A.A. Borodenko, A.R. Buzykaev, S.I. Eidelman, D.N. Grigoriev, Yu.M. Glukhovchenko, S.E. Karnaev, G.V. Karpov, S.V. Karpov, P.V. Kasyanenko, T.A. Kharlamova, V.A. Kiselev, V.V. Kolmogorov, S.A. Kononov, K.Yu. Kotov, E.A. Kravchenko, V.N. Kudryavtsev, V.F. Kulikov, G.Ya. Kurkin, I.A. Kuyanov, E.A. Kuper, E.B. Levichev, D.A. Maksimov, V.M. Malyshev, A.L. Maslennikov, O.I. Meshkov, S.I. Mishnev, I.I. Morozov, N.Yu. Muchnoi, V.V. Neufeld, S.A. Nikitin, I.B. Nikolaev, I.N. Okunev, A.P. Onuchin, S.B. Oreshkin, A.A. Osipov, I.V. Ovtin, S.V. Peleganchuk, V.V. Petrov, S.G. Pivovarov, P.A. Piminov, V.G. Prisekin, O.L. Rezanova, A.A. Ruban, V.K. Sandyrev, G.A. Savinov, A.G. Shamov, D.N. Shatilov, B.A. Shwartz, E.A. Simonov, S.V. Sinyatkin, A.N. Skrinsky, A.V. Sokolov, A.M. Sukharev, E.V. Starostina, A.A. Talyshev, V.A. Tayursky, V.I. Telnov, Yu.A. Tikhonov, K.Yu. Todyshev, G.M. Tumaikin, Yu.V. Usov, A.I. Vorobiov, V.N. Zhilich, V.V. Zhulanov, and A.N. Zhuravlev

Subjects
Physics, QC1-999
Abstract

Using the KEDR detector at the VEPP-4M e+e− collider, we have measured the values of Ruds and R at seven points of the center-of-mass energy between 3.12 and 3.72 GeV. The total achieved accuracy is about or better than 3.3% at most of energy points with a systematic uncertainty of about 2.1%. At the moment it is the most accurate measurement of R(s) in this energy range.

Published
2016
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5. Final analysis of KEDR data on J/ψ and ψ(2S) masses

Author

V.V. Anashin, V.M. Aulchenko, E.M. Baldin, A.K. Barladyan, A.Yu. Barnyakov, M.Yu. Barnyakov, S.E. Baru, I.Yu. Basok, A.M. Batrakov, A.E. Blinov, V.E. Blinov, A.V. Bobrov, V.S. Bobrovnikov, A.V. Bogomyagkov, A.E. Bondar, A.A. Borodenko, A.R. Buzykaev, S.I. Eidelman, D.N. Grigoriev, Yu.M. Glukhovchenko, S.E. Karnaev, G.V. Karpov, S.V. Karpov, T.A. Kharlamova, V.A. Kiselev, V.V. Kolmogorov, S.A. Kononov, K.Yu. Kotov, E.A. Kravchenko, V.N. Kudryavtsev, V.F. Kulikov, G.Ya. Kurkin, I.A. Kuyanov, E.A. Kuper, E.B. Levichev, D.A. Maksimov, V.M. Malyshev, A.L. Maslennikov, O.I. Meshkov, S.I. Mishnev, I.I. Morozov, N.Yu. Muchnoi, V.V. Neufeld, S.A. Nikitin, I.B. Nikolaev, I.N. Okunev, A.P. Onuchin, S.B. Oreshkin, A.A. Osipov, I.V. Ovtin, S.V. Peleganchuk, S.G. Pivovarov, P.A. Piminov, V.V. Petrov, V.G. Prisekin, O.L. Rezanova, A.A. Ruban, V.K. Sandyrev, G.A. Savinov, A.G. Shamov, D.N. Shatilov, B.A. Shwartz, E.A. Simonov, S.V. Sinyatkin, A.N. Skrinsky, A.V. Sokolov, A.M. Sukharev, E.V. Starostina, A.A. Talyshev, V.A. Tayursky, V.I. Telnov, Yu.A. Tikhonov, K.Yu. Todyshev, G.M. Tumaikin, Yu.V. Usov, A.I. Vorobiov, V.N. Zhilich, V.V. Zhulanov, and A.N. Zhuravlev

Subjects
Physics, QC1-999
Abstract

We present the analysis of all KEDR data on the determination of J/ψ and ψ(2S) masses. The data comprise six scans of J/ψ and seven scans of ψ(2S) which were performed at the VEPP-4M e+e− collider in 2002–2008. The beam energy was determined using the resonance depolarization method. The detector and accelerator conditions during scans were very different that increases the reliability of the averaged results. The analysis accounts for partial correlations of systematic uncertainties on the masses. The following mass values were obtained:MJ/ψ=3096.900±0.002±0.006 MeV,Mψ(2S)=3686.099±0.004±0.009 MeV. These results supersede our previous measurements published in 2003 and 2012.

Published
2015
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6. Measurement of J/ψ→γηc decay rate and ηc parameters at KEDR

Author

V.V. Anashin, V.M. Aulchenko, E.M. Baldin, A.K. Barladyan, A.Yu. Barnyakov, M.Yu. Barnyakov, S.E. Baru, I.Yu. Basok, I.V. Bedny, A.E. Blinov, V.E. Blinov, A.V. Bobrov, V.S. Bobrovnikov, A.V. Bogomyagkov, A.E. Bondar, A.R. Buzykaev, S.I. Eidelman, Yu.M. Glukhovchenko, V.V. Gulevich, D.V. Gusev, S.E. Karnaev, G.V. Karpov, S.V. Karpov, T.A. Kharlamova, V.A. Kiselev, S.A. Kononov, K.Yu. Kotov, E.A. Kravchenko, 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.I. Mishnev, I.I. Morozov, N.Yu. Muchnoi, V.V. Neufeld, S.A. Nikitin, I.B. Nikolaev, I.N. Okunev, A.P. Onuchin, S.B. Oreshkin, I.O. Orlov, A.A. Osipov, S.V. Peleganchuk, S.G. Pivovarov, P.A. Piminov, V.V. Petrov, A.O. Poluektov, G.E. Pospelov, V.G. Prisekin, O.L. Rezanova, A.A. Ruban, V.K. Sandyrev, G.A. Savinov, A.G. Shamov, D.N. Shatilov, B.A. Shwartz, E.A. Simonov, S.V. Sinyatkin, A.N. Skrinsky, V.V. Smaluk, A.V. Sokolov, A.M. Sukharev, E.V. Starostina, 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, V.V. Zhulanov, and A.N. Zhuravlev

Subjects
Physics, QC1-999
Abstract

Using the inclusive photon spectrum based on a data sample collected at the J/ψ peak with the KEDR detector at the VEPP-4M e+e− collider, we measured the rate of the radiative decay J/ψ→γηc as well as ηc mass and width. Taking into account an asymmetric photon lineshape we obtained Γγηc0=2.98±0.18−0.33+0.15keV, Mηc=2983.5±1.4−3.6+1.6MeV/c2, Γηc=27.2±3.1−2.6+5.4MeV. Keywords: Charmonium, Radiative decays

Published
2014
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7. Results on , , from KEDR

Author

E.M. Baldin, V.V. Anashin, V.M. Aulchenko, 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, S.I. Eidelman, Yu.M. Glukhovchenko, V.R. Groshev, V.V. Gulevich, S.E. Karnaev, G.V. Karpov, S.V. Karpov, V.A. Kiselev, S.A. Kononov, T.A. Kozlova, 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.I. Mishnev, I.I. Morozov, N.Yu. Muchnoi, V.V. Neufeld, S.A. Nikitin, I.B. Nikolaev, I.N. Okunev, 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, I.N. Popkov, G.E. Pospelov, V.G. Prisekin, A.A. Ruban, V.K. Sandyrev, G.A. Savinov, A.G. Shamov, D.N. Shatilov, B.A. Shwartz, E.A. Simonov, S.V. Sinyatkin, Yu.I. Skovpen, A.N. Skrinsky, V.V. Smaluk, A.M. Sukharev, 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, V.V. Zhulanov, and A.N. Zhuravlev

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, D meson, Atomic and Molecular Physics, and Optics
Abstract

New measurements of ψ ( 2 S ) , ψ ( 3770 ) and D meson masses are presented. The results of the scans performed were used for determination of the products Γ e e × Γ e e / Γ for J / ψ and Γ e e × Γ μ μ / Γ for ψ ( 2 S ) .

Published
2008

8. New precise determination of the τ lepton mass at KEDR detector

Author

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, and A.N. Zhuravlev

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, law, Detector, High Energy Physics::Experiment, Production (computer science), Collider, Mass measurement, Atomic and Molecular Physics, and Optics, High Energy Physics - Experiment, Lepton, law.invention
Abstract

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., Comment: 6 pages, 8 figures; The 9th International Workshop on Tau-Lepton Physics, Tau06

Published
2007

9. Tau mass measurement at KEDR

Author

A.G. Shamov, 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.V. Bobrov, V.S. Bobrovnikov, A.V. Bogomyagkov, A.E. Bondar, D.V. Bondarev, A.R. Buzykaev, S.I. Eidelman, Yu.M. Glukhovchenko, V.V. Gulevich, S.E. Karnaev, G.V. Karpov, S.V. Karpov, V.A. Kiselev, S.A. Kononov, T.A. Kozlova, K.Yu. Kotov, E.A. Kravchenko, 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.I. Mishnev, I.I. Morozov, N.Yu. Muchnoi, V.V. Neufeld, S.A. Nikitin, I.B. Nikolaev, I.N. Okunev, 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, I.N. Popkov, G.E. Pospelov, V.G. Prisekin, A.A. Ruban, V.K. Sandyrev, G.A. Savinov, D.N. Shatilov, B.A. Shwartz, E.A. Simonov, S.V. Sinyatkin, Yu.I. Skovpen, A.N. Skrinsky, V.V. Smaluk, A.M. Sukharev, E.V. Starostina, 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, V.V. Zhulanov, and A.N. Zhuravlev

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, law, Collider, Mass measurement, Atomic and Molecular Physics, and Optics, Lepton, law.invention
Abstract

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 behavior around the production threshold. The preliminary result based on 15.2 pb −1 of data is m τ = 1776.69 −0.19 +0.17 ± 0.15 MeV .

Published
2009

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