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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. Charm at KEDR

Author

O.V. Anchugov, E.A. Bekhtenev, N. Yu. Muchnoi, N. A. Podgornov, P.V. Kasyanenko, A. R. Buzykaev, S. Eidelman, A. Bobrov, A.G. Tribendis, Vladimir Zhulanov, S.E. Baru, V. E. Blinov, V. V. Kaminskiy, B. Shwartz, D.N. Grigoriev, Valery I. Telnov, A.M. Sukharev, Sergey Karnaev, G.A. Savinov, G. V. Karpov, Yu. I. Maltseva, P.B. Cheblakov, S.B. Oreshkin, D.P. Kashtankin, M. Blinov, Yu. V. Usov, V. V. Petrov, A.N. Skrinsky, A. N. Zhuravlev, Sergey Sinyatkin, S.V. Karpov, K. Astrelina, V.L. Dorohov, A. A. Katcin, V. F. Kulikov, Pavel Piminov, V. V. Gambaryan, D.P. Sukhanov, V. M. Aulchenko, I.Yu. Basok, L. I. Shekhtman, V. S. Bobrovnikov, V. A. Tayursky, Evgeny Levichev, K.Yu. Kotov, Ivan Ovtin, I.N. Okunev, S.A. Kononov, A.A. Zhukov, G. Yu. Kurkin, O. Belikov, G.N. Baranov, E. A. Simonov, D.A. Shvedov, A.A. Ruban, Anton Bogomyagkov, M. Yu. Barnyakov, A. I. Vorobiov, S. A. Glukhov, A.A. Krasnov, V. Kudryavtsev, F. Emanov, I. B. Nikolaev, A. V. Osipov, S. E. Mishnev, I. A. Kuyanov, Alexey Talyshev, V. A. Kiselev, S.G. Pivovarov, A.K. Barladyan, Sergey Peleganchuk, V.V. Anashin, K. Yu. Todyshev, A.G. Shamov, K.Yu. Karukina, D. E. Berkaev, A. E. Blinov, A.E. Bondar, Evgenii Baldin, A. Andrianov, V. M. Malyshev, Andrey Sokolov, P. V. Logachev, E.V. Starostina, Tatyana Kharlamova, V.N. Zhilich, Oleg Meshkov, Alexey Maslennikov, E. A. Kravchenko, A. V. Pavlenko, D. A. Maksimov, D. Nikiforov, A. Yu. Barnyakov, A. P. Onuchin, S.A. Nikitin, D. Yu. Bolkhovityanov, V.G. Prisekin, V. V. Oreshonok, Olga Rezanova, G.M. Tumaikin, Yu. A. Tikhonov, and I. I. Morozov

Subjects
Physics, Particle physics, Meson, High Energy Physics::Lattice, High Energy Physics::Phenomenology, High Energy Physics::Experiment, Charm (quantum number), Nuclear Experiment
Abstract

We review the recent results obtained by the KEDR experiment in the charmonium energy range. They include the measurements of $J/\psi$ meson total and partial widths and exclusive branching fractions, study of $D^+$ and $D^0$ meson masses and R between 1.8 and 7.0 GeV.

Published
2021

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

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Muon, Meson, 010308 nuclear & particles physics, Branching fraction, Electron–positron annihilation, Hadron, 01 natural sciences, 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics, Lepton
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: Γ e e × B μ μ = 19.3 ± 0.3 ± 0.5 eV . 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 universality Γ e e = 2.279 ± 0.015 ± 0.042 keV or without it, summing up hadronic and three independent leptonic channels Γ e e = 2.282 ± 0.015 ± 0.042 keV .

Published
2018

9. Precise measurement of And between 1.84 and 3.72 GeV at the KEDR detector

Author

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

Subjects
Systematic error, Physics, Nuclear and High Energy Physics, Range (particle radiation), 010308 nuclear & particles physics, Detector, Monte Carlo method, FOS: Physical sciences, 01 natural sciences, R-value (insulation), lcsh:QC1-999, law.invention, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), law, 0103 physical sciences, 010306 general physics, Collider, lcsh:Physics
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 $R_{\text{uds}}$ 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., arXiv admin note: text overlap with arXiv:1610.02827 and substantial text overlap with arXiv:1510.02667

Published
2018

10. Measurement of Γee(J/ψ) with KEDR detector

Author

K. Y. Kotov, E.A. Kuper, Sergey Peleganchuk, E.V. Starostina, I.N. Okunev, V.V. Neufeld, A. Bobrov, V.A. Tayursky, V. S. Bobrovnikov, Andrey Sokolov, I. O. Orlov, Tatyana Kharlamova, S.A. Kononov, Anton Poluektov, Sergey Karnaev, G.A. Savinov, I.I. Morozov, V. V. Petrov, S.G. Pivovarov, A.G. Shamov, Alexey Talyshev, A.M. Sukharev, I. B. Nikolaev, S.V. Karpov, Yu.M. Glukhovchenko, Victor Smaluk, Dmitry Shatilov, S. I. Mishnev, E. A. Kravchenko, Alexey Maslennikov, V.K. Sandyrev, E. A. Simonov, A. E. Blinov, S.A. Nikitin, I. N. Popkov, A.A. Ruban, V. A. Kiselev, A.N. Skrinsky, A.E. Bondar, Olga Rezanova, A.A. Osipov, S.I. Eidelman, Yu I. Skovpen, Evgenii Baldin, Alexey Buzykaev, B.A. Shwartz, S.B. Oreshkin, Valery I. Telnov, Vladimir Blinov, A.N. Zhuravlev, A. S. Medvedko, D.V. Bondarev, Yury Tikhonov, V. M. Malyshev, Vladimir Zhulanov, N. Y. Muchnoi, G. Y. Kurkin, D.A. Maksimov, G.V. Karpov, V.F. Kulikov, Sergey Sinyatkin, A.I. Vorobiov, A.K. Barladyan, Pavel Piminov, M. Y. Barnyakov, V.M. Aulchenko, V.V. Anashin, I. Bedny, Alexander Barnyakov, G.M. Tumaikin, A.V. Bogomyagkov, Yu. V. Usov, Evgeny Levichev, V.G. Prisekin, S.E. Baru, V.N. Zhilich, Oleg Meshkov, K. Y. Todyshev, A. P. Onuchin, V.V. Gulevich, A. N. Yushkov, and D. V. Gusev

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, e+-e- Experiments, Meson, 010308 nuclear & particles physics, Branching fraction, Electron–positron annihilation, Hadron, 01 natural sciences, Product (mathematics), 0103 physical sciences, lcsh:QC770-798, High Energy Physics::Experiment, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, 010306 general physics
Abstract

The product of the electronic width of the J/ψ meson and the branching fractions of its decay to hadrons and electrons has been measured using the KEDR detector at the VEPP-4M e + e − collider. The obtained values are $$ \begin{array}{c}\hfill {\Gamma}_{ee}\left(J/\psi \right)=5.550\pm 0.056\pm 0.089\kern0.5em \mathrm{keV},\hfill \\ {}\hfill {\Gamma}_{ee}\left(J/\psi \right)\cdotp {\mathrm{\mathcal{B}}}_{\mathrm{hadrons}}\left(J/\psi \right)=4.884\pm 0.048\pm 0.078\kern0.5em \mathrm{keV},\hfill \\ {}\hfill {\Gamma}_{ee}\left(J/\psi \right)\cdotp {\mathrm{\mathcal{B}}}_{ee}\left(J/\psi \right)=0.3331\pm 0.0066\pm 0.0040\kern0.5em \mathrm{keV}.\hfill \end{array} $$ Γ e e J / ψ = 5.550 ± 0.056 ± 0.089 keV , Γ e e J / ψ · ℬ hadrons J / ψ = 4.884 ± 0.048 ± 0.078 keV , Γ e e J / ψ · ℬ e e J / ψ = 0.3331 ± 0.0066 ± 0.0040 keV . The uncertainties shown are statistical and systematic, respectively. Using the result presented and the world-average value of the electronic branching fraction, one obtains the total width of the J/ψ meson: $$ \Gamma =92.94\pm 1.83\kern0.5em \mathrm{keV}. $$ Γ = 92.94 ± 1.83 keV . These results are consistent with the previous experiments.

Published
2018

11. Final analysis of KEDR data onJ/ψandψ(2S)masses

Author

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

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, law, Electron–positron annihilation, Resonance, Collider, Beam energy, law.invention
Abstract

We present the analysis of all KEDR data on the determination of J / ψ and ψ ( 2 S ) masses. The data comprise six scans of J / ψ and seven scans of ψ ( 2 S ) 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: M J / ψ = 3096.900 ± 0.002 ± 0.006 MeV , M ψ ( 2 S ) = 3686.099 ± 0.004 ± 0.009 MeV . These results supersede our previous measurements published in 2003 and 2012.

Published
2015

12. Measurement of J/ψ→γηc decay rate and ηc parameters at KEDR

Author

A. N. Yushkov, A.A. Osipov, S. I. Mishnev, A. P. Onuchin, Vladimir Blinov, V.M. Aulchenko, A.K. Barladyan, A.N. Zhuravlev, Sergey Peleganchuk, M.Yu. Barnyakov, G.A. Savinov, E.V. Starostina, Alexey Maslennikov, E.A. Kuper, Anton Poluektov, V.V. Anashin, Alexey Talyshev, V.V. Neufeld, V.V. Gulevich, V.G. Prisekin, A.Yu. Barnyakov, Olga Rezanova, E. A. Kravchenko, A.N. Skrinsky, I. Bedny, N. Yu. Muchnoi, D. A. Maksimov, V.K. Sandyrev, I.B. Nikolaev, A.E. Bondar, A.S. Medvedko, S.V. Karpov, A.V. Bogomyagkov, Evgenii Baldin, I.Yu. Basok, Yu. V. Usov, A. Sokolov, V. M. Malyshev, G.M. Tumaikin, I.I. Morozov, Yu.M. Glukhovchenko, V.N. Zhilich, V. V. Petrov, Oleg Meshkov, S.I. Eidelman, Dmitry Shatilov, A.A. Ruban, A. Bobrov, B.A. Shwartz, S.B. Oreshkin, Victor Bobrovnikov, Vladimir Zhulanov, V.F. Kulikov, A.M. Sukharev, Tatyana Kharlamova, S.G. Pivovarov, A.G. Shamov, A. E. Blinov, V.A. Tayursky, K.Yu. Kotov, I.N. Okunev, V. A. Kiselev, D. V. Gusev, A. R. Buzykaev, S.E. Baru, S.A. Kononov, G.Ya. Kurkin, G.V. Karpov, Evgeny Levichev, A.I. Vorobiov, Valery I. Telnov, E. A. Simonov, S.A. Nikitin, Victor Smaluk, Yu. A. Tikhonov, I.O. Orlov, Sergey Sinyatkin, Pavel Piminov, G. E. Pospelov, K. Yu. Todyshev, and Sergey Karnaev

Subjects
Physics, Nuclear and High Energy Physics, Photon, law, Electron–positron annihilation, Detector, Radiative decay, Atomic physics, Collider, law.invention
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 → γ η c as well as η c mass and width. Taking into account an asymmetric photon lineshape we obtained Γ γ η c 0 = 2.98 ± 0.18 − 0.33 + 0.15 keV , M η c = 2983.5 ± 1.4 − 3.6 + 1.6 MeV / c 2 , Γ η c = 27.2 ± 3.1 − 2.6 + 5.4 MeV .

Published
2014

13. Measurement of the ratio of the lepton widths Γee/Γμμ for the J/ψ meson

Author

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

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Muon, Meson, Physics::Accelerator Physics, High Energy Physics::Experiment, Electron, Lepton
Abstract

The ratio of the electron and muon widths of the J / ψ meson has been measured using direct J / ψ decays in the KEDR experiment at the VEPP-4M electron–positron collider. The result Γ e + e − ( J / ψ ) / Γ μ + μ − ( J / ψ ) = 1.0022 ± 0.0044 ± 0.0048 ( 0.65 % ) is in good agreement with the lepton universality. The experience collected during this analysis will be used for J / ψ lepton width determination with up to 1% accuracy.

Published
2014

14. Measurement of $R$ between 1.84 and 3.05 GeV at the KEDR detector

Author

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

Subjects
Physics, Systematic error, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Electron–positron annihilation, Detector, FOS: Physical sciences, 01 natural sciences, lcsh:QC1-999, law.invention, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), law, 0103 physical sciences, 010306 general physics, Collider, lcsh:Physics, Energy (signal processing)
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
2016
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15. Measurement of main parameters of the ψ(2S) resonance

Author

M.Yu. Barnyakov, S.G. Pivovarov, S.I. Eidelman, V.F. Kulikov, A. Bobrov, K. Yu. Todyshev, E. A. Simonov, K.Yu. Kotov, S.A. Nikitin, A.G. Shamov, O. L. Beloborodova, Yu. A. Tikhonov, A. R. Buzykaev, A.N. Skrinsky, S.B. Oreshkin, S.V. Karpov, A.K. Barladyan, V.V. Gulevich, Victor Smaluk, V.V. Kolmogorov, N. Yu. Muchnoi, I.O. Orlov, A.N. Zhuravlev, G.Ya. Kurkin, Sergey Sinyatkin, Alexey Talyshev, Pavel Piminov, A. E. Blinov, I. B. Nikolaev, G.V. Karpov, D.N. Grigoriev, Yu. V. Usov, A.I. Vorobiov, Sergey Peleganchuk, A. N. Yushkov, I.N. Okunev, Dmitry Shatilov, D. V. Gusev, V.V. Anashin, B.A. Shwartz, V.A. Tayursky, G.A. Savinov, Sergey Karnaev, V.M. Aulchenko, V.N. Zhilich, A.A. Ruban, A.E. Bondar, Oleg Meshkov, A.S. Medvedko, Valery I. Telnov, E.A. Kuper, I.Yu. Basok, Evgenii Baldin, Tatyana Kharlamova, V. A. Kiselev, Anton Poluektov, A. Sokolov, S.A. Kononov, Vladimir Zhulanov, A.M. Sukharev, V.K. Sandyrev, Evgeny Levichev, Yu.M. Glukhovchenko, D.A. Maksimov, S.E. Baru, V. E. Blinov, A.V. Bogomyagkov, E.V. Starostina, V.V. Neufeld, I. I. Morozov, V. M. Malyshev, A. Yu. Barnyakov, A.A. Osipov, S. I. Mishnev, A. P. Onuchin, G.M. Tumaikin, Victor Bobrovnikov, V.G. Prisekin, Alexey Maslennikov, V. V. Petrov, and E. A. Kravchenko

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Annihilation, Partial width, Branching fraction, Hadron, High Energy Physics::Experiment, Electron, Atomic physics
Abstract

A high-precision determination of the main parameters of the ψ ( 2 S ) resonance has been performed with the KEDR detector at the VEPP-4M e + e − collider in three scans of the ψ ( 2 S ) – ψ ( 3770 ) energy range. Fitting the energy dependence of the multihadron cross section in the vicinity of the ψ ( 2 S ) we obtained the mass value M = 3686.114 ± 0.007 ± 0.011 − 0.012 + 0.002 MeV and the product of the electron partial width by the branching fraction into hadrons Γ e e × B h = 2.233 ± 0.015 ± 0.037 ± 0.020 keV . The first and second uncertainties are statistical and systematic, respectively. The third uncertainty quoted is an estimate of the model dependence of the result due to assumptions on the interference effects in the cross section of the single-photon e + e − annihilation to hadrons explicitly considered in this work. Implicitly, the same assumptions were employed to obtain the charmonium leptonic width and the absolute branching fractions in many experiments. Using the result presented and the world average values of the electron and hadron branching fractions, one obtains the electron partial width and the total width of the ψ ( 2 S ) : Γ e e = 2.282 ± 0.015 ± 0.038 ± 0.021 keV , Γ = 296 ± 2 ± 8 ± 3 keV . These results are consistent with and more than two times more precise than any of the previous experiments.

Published
2012

16. Search for narrow resonances in e+e− annihilation between 1.85 and 3.1 GeV with the KEDR detector

Author

S.G. Pivovarov, A.G. Shamov, V. V. Petrov, D.N. Grigoriev, V. E. Blinov, S.I. Eidelman, Yu.M. Glukhovchenko, D. V. Gusev, Tatyana Kharlamova, V.F. Kulikov, V.N. Zhilich, V.M. Aulchenko, Oleg Meshkov, A.N. Zhuravlev, A.K. Barladyan, V.V. Gulevich, G.M. Tumaikin, A.V. Bogomyagkov, V.V. Anashin, V. M. Malyshev, A. N. Yushkov, Sergey Peleganchuk, A. Bobrov, G.A. Savinov, E. A. Kravchenko, Sergey Karnaev, D. A. Maksimov, S.B. Oreshkin, K.Yu. Kotov, S.E. Baru, Valery I. Telnov, O. L. Beloborodova, A.A. Ruban, V. A. Kiselev, V.K. Sandyrev, A.E. Bondar, E.A. Kuper, N. Yu. Muchnoi, I.B. Nikolaev, S.V. Karpov, Evgenii Baldin, B.A. Shwartz, A. Sokolov, S.A. Kononov, A. Yu. Barnyakov, A.N. Skrinsky, V. Kudryavtsev, A.A. Osipov, S. I. Mishnev, A. P. Onuchin, M.Yu. Barnyakov, Vladimir Zhulanov, Yu. V. Usov, I.N. Okunev, K. Yu. Todyshev, E.V. Starostina, V.V. Neufeld, V.V. Kolmogorov, Alexey Talyshev, A.S. Medvedko, I.Yu. Basok, I.I. Morozov, Anton Poluektov, Alexey Maslennikov, Dmitry Shatilov, Victor Smaluk, V.G. Prisekin, I.O. Orlov, Sergey Sinyatkin, Pavel Piminov, A. E. Blinov, E. A. Simonov, S.A. Nikitin, Yu. A. Tikhonov, A. R. Buzykaev, Victor Bobrovnikov, V.A. Tayursky, G.V. Karpov, A.I. Vorobiov, Evgeny Levichev, G.Ya. Kurkin, and A.M. Sukharev

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, law, Electron–positron annihilation, Detector, Resonance, High Energy Physics::Experiment, Collider, law.invention
Abstract

We report results of a search for narrow resonances in e + e − annihilation at center-of-mass energies between 1.85 and 3.1 GeV performed with the KEDR detector at the VEPP-4M e + e − collider. The upper limit on the leptonic width of a narrow resonance Γ e e R ⋅ Br ( R → h a d r ) 120 eV has been obtained (at 90% C.L.).

Published
2011

17. τ lepton mass determination at KEDR

Author

Yu. I. Skovpen, Andrey Sokolov, E. A. Kravchenko, S.I. Eidelman, G.V. Karpov, A.N. Zhuravlev, N. Yu. Muchnoi, E.A. Kuper, S.A. Kononov, S.V. Karpov, A. N. Yushkov, Valery I. Telnov, V. V. Petrov, A.A. Ruban, D. A. Maksimov, V. A. Kiselev, A.E. Bondar, Alexey Talyshev, A. I. Vorobiov, V.V. Neufeld, Evgenii Baldin, M.Yu. Barnyakov, G.A. Savinov, I. B. Nikolaev, I.N. Okunev, I.O. Orlov, Sergey Sinyatkin, Alexey Maslennikov, Victor Bobrovnikov, V.V. Gulevich, Yu.M. Glukhovchenko, Yu. V. Usov, G.Ya. Kurkin, S.B. Oreshkin, Anton Poluektov, V.N. Zhilich, V. M. Malyshev, Oleg Meshkov, V.K. Sandyrev, Pavel Piminov, A. E. Blinov, Victor Smaluk, A.K. Barladyan, A.G. Shamov, B.A. Shwartz, A. R. Buzykaev, V.G. Prisekin, Vladimir Zhulanov, V.V. Anashin, I.I. Morozov, A. Yu. Barnyakov, Dmitry Shatilov, A.A. Osipov, E. A. Simonov, S. I. Mishnev, A. P. Onuchin, S.A. Nikitin, E. V. Starostina, Tatyana Kharlamova, Sergey Karnaev, I. Bedny, Yu. A. Tikhonov, G.M. Tumaikin, V. E. Blinov, G. E. Pospelov, K. Yu. Todyshev, A.V. Bogomyagkov, Evgeny Levichev, S.E. Baru, A.M. Sukharev, K.Yu. Kotov, D. V. Gusev, O. L. Beloborodova, V.A. Tayursky, S. G. Pivovarov, V.F. Kulikov, A.S. Medvedko, I.Yu. Basok, A. Bobrov, A.N. Skrinsky, Sergey Peleganchuk, and V.M. Aulchenko

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Physics::Instrumentation and Detectors, High Energy Physics::Phenomenology, Detector, Atomic and Molecular Physics, and Optics, law.invention, Nuclear physics, law, Physics::Accelerator Physics, High Energy Physics::Experiment, Collider, Lepton
Abstract

We present preliminary results of a new high-precision determination of the τ lepton mass performed with the KEDR detector at the VEPP-4M e + e − collider. These results are compared to two recent τ lepton mass measurements at Belle and BaBar.

Published
2011

18. MEASUREMENT OF $\mathcal{B}(J/\psi\to \eta_{{\rm c}}\gamma)$ AT KEDR

Author

E. A. Kravchenko, Anton Poluektov, V.G. Prisekin, S.A. Kononov, K. Yu Todyshev, S.G. Pivovarov, Yu.M. Glukhovchenko, Yu. I. Skovpen, V.N. Zhilich, Oleg Meshkov, Valery I. Telnov, I.N. Okunev, A. Yu. Barnyakov, A. S. Medvedko, E.A. Kuper, E. A. Simonov, V. F. Kulikov, V. V. Petrov, A.A. Osipov, V.K. Sandyrev, A. I. Milstein, S. I. Mishnev, A. P. Onuchin, G.Ya. Kurkin, V. E. Blinov, G. V. Karpov, Evgeny Levichev, S.A. Nikitin, S.I. Eidelman, Yu. A. Tikhonov, A.G. Shamov, Yu. V. Usov, N. Yu. Muchnoi, A. Bobrov, A.E. Bondar, M.Yu. Barnyakov, Evgenii Baldin, D. A. Maksimov, Alexey Maslennikov, V. A. Kiselev, V. A. Tayursky, Sergey Peleganchuk, A.N. Skrinsky, G. E. Pospelov, A. I. Vorobiov, A. E. Blinov, A.A. Ruban, A. R. Buzykaev, Dmitry Shatilov, I. Bedny, I. B. Nikolaev, D. V. Gusev, S.E. Baru, Victor Smaluk, V. V. Gulevich, A.K. Barladyan, A. N. Yushkov, Sergey Sinyatkin, S.V. Karpov, Pavel Piminov, B.A. Shwartz, V. M. Aulchenko, A.M. Sukharev, V.V. Anashin, G.A. Savinov, S.B. Oreshkin, A. N. Zhuravlev, G.M. Tumaikin, A. V. Bogomyagkov, K.Yu. Kotov, I. I. Morozov, I. O. Orlov, Tatyana Kharlamova, O. L. Beloborodova, Vladimir Zhulanov, I.Yu. Basok, Sergey Karnaev, Alexey Talyshev, Andrey Sokolov, V. M. Malyshev, E.V. Starostina, V.V. Neufeld, and V. S. Bobrovnikov

Subjects
Physics, Particle physics, Photon, Branching fraction, law, Radiative decay, Analytical chemistry, Collider, law.invention
Abstract

We present a study of the inclusive photon spectrum from 6.3 million J/ψ decays collected with the KEDR detector at the VEPP-4M e+e- collider. We measure the branching fraction of the radiative decay J/ψ → ηcγ, ηc width and mass. Taking into account an asymmetric photon line shape we obtain: Mηc = (2978.1 ± 1.4 ± 2.0) MeV/c2, Γηc = (43.5 ± 5.4 ± 15.8) MeV, [Formula: see text].

Published
2011

19. Measurement of Γee(J/ψ)⋅B(J/ψ→e+e−) and Γee(J/ψ)⋅B(J/ψ→μ+μ−)

Author

V. A. Tayursky, Yu.M. Glukhovchenko, A.K. Barladyan, Dmitry Shatilov, K.Yu. Kotov, V.V. Anashin, O. L. Beloborodova, I. N. Popkov, V. S. Bobrovnikov, S.I. Eidelman, I.N. Okunev, S.E. Baru, E.A. Kuper, E. A. Simonov, Sergey Peleganchuk, V. M. Malyshev, A.M. Sukharev, S.G. Pivovarov, Yu. I. Skovpen, A.N. Skrinsky, Alexey Maslennikov, A. I. Vorobiov, E.V. Starostina, Yu. A. Tikhonov, A. E. Blinov, V.K. Sandyrev, S.B. Oreshkin, G.A. Savinov, V.V. Neufeld, A. Bobrov, V. E. Blinov, D. V. Gusev, A.E. Bondar, Alexey Talyshev, Evgenii Baldin, B.A. Shwartz, V.N. Zhilich, Andrey Sokolov, Oleg Meshkov, V. M. Aulchenko, A. R. Buzykaev, A. N. Yushkov, A.G. Shamov, V. A. Kiselev, A. N. Zhuravlev, S.A. Kononov, Vladimir Zhulanov, A.A. Ruban, K. Yu Todyshev, Anton Poluektov, V. V. Gulevich, Valery I. Telnov, D. A. Maksimov, G.Ya. Kurkin, M.Yu. Barnyakov, Sergey Sinyatkin, N. Yu. Muchnoi, Pavel Piminov, V. F. Kulikov, A. S. Medvedko, S.V. Karpov, G. V. Karpov, Evgeny Levichev, I. B. Nikolaev, I. O. Orlov, Tatyana Kharlamova, Yu. V. Usov, A. V. Bogomyagkov, I. I. Morozov, I. Bedny, G.M. Tumaikin, A. Yu. Barnyakov, A.A. Osipov, S. I. Mishnev, A. P. Onuchin, S.A. Nikitin, E. A. Kravchenko, V. V. Petrov, V.G. Prisekin, Sergey Karnaev, Victor Smaluk, and D.V. Bondarev

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Meson, Branching fraction, Electron–positron annihilation, High Energy Physics::Experiment, Electron, Nuclear Experiment, Lepton
Abstract

The products of the electron width of the J/ψ meson and the branching fraction of its decays to the lepton pairs were measured using data from the KEDR experiment at the VEPP-4M electron–positron collider. The results are Γee×Γee/Γ=0.3323±0.0064(stat.)±0.0048(syst.) keV, Γee×Γμμ/Γ=0.3318±0.0052(stat.)±0.0063(syst.) keV. Their combinations Γee×(Γee+Γμμ)/Γ=0.6641±0.0082(stat.)±0.0100(syst.) keV, Γee/Γμμ=1.002±0.021(stat.)±0.013(syst.) can be used to improve the accuracy of the leptonic and full widths and test leptonic universality.

Published
2010

20. Measurement of D0 and D+ meson masses with the KEDR detector

Author

Oleg Meshkov, G.Ya. Kurkin, K.Yu. Kotov, Anton Poluektov, A. R. Buzykaev, I. N. Popkov, E. A. Kravchenko, V.G. Prisekin, D. A. Maksimov, O. L. Beloborodova, Valery I. Telnov, V. E. Blinov, I.O. Orlov, Sergey Sinyatkin, E.A. Kuper, S.E. Baru, V. M. Malyshev, V.F. Kulikov, V.M. Aulchenko, A.M. Sukharev, Pavel Piminov, A. E. Blinov, G.A. Savinov, E.V. Starostina, M.Yu. Barnyakov, A.N. Zhuravlev, A.S. Medvedko, Victor Smaluk, V. V. Petrov, V.K. Sandyrev, S.A. Kononov, A.V. Bogomyagkov, Yu. V. Usov, V.V. Neufeld, E. A. Simonov, A. Yu. Barnyakov, V.A. Tayursky, S.A. Nikitin, A.A. Osipov, S. I. Mishnev, A.K. Barladyan, Sergey Peleganchuk, I.I. Morozov, S.I. Eidelman, A. P. Onuchin, Yu. I. Skovpen, A. Bobrov, Yu. A. Tikhonov, V.V. Gulevich, D.V. Bondarev, A.A. Ruban, Alexey Maslennikov, G.V. Karpov, V.V. Anashin, N. Yu. Muchnoi, I. Bedny, I.B. Nikolaev, Dmitry Shatilov, A.E. Bondar, A.N. Skrinsky, A.I. Vorobiov, Tatyana Kharlamova, S.V. Karpov, Evgenii Baldin, Evgeny Levichev, S.G. Pivovarov, G.M. Tumaikin, A. Sokolov, K. Yu. Todyshev, A.G. Shamov, A. N. Yushkov, Victor Bobrovnikov, Sergey Karnaev, D. V. Gusev, S.B. Oreshkin, Alexey Talyshev, B.A. Shwartz, Vladimir Zhulanov, Yu.M. Glukhovchenko, I.N. Okunev, V. A. Kiselev, and V.N. Zhilich

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Meson, Electron–positron annihilation, Nuclear Theory, Detector, law.invention, Nuclear physics, Positron, law, D meson, Physics::Accelerator Physics, High Energy Physics::Experiment, Nuclear Experiment, Collider, Astrophysics::Galaxy Astrophysics, X(3872)
Abstract

The masses of the neutral and charged D mesons have been measured with the KEDR detector at the VEPP-4M electron–positron collider: M D 0 = 1865.30 ± 0.33 ± 0.23 MeV , M D + = 1869.53 ± 0.49 ± 0.20 MeV .

Published
2010

21. 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

22. Recent results from the KEDR detector

Author

Alexey Talyshev, A.M. Batrakov, V. R. Groshev, M.Yu. Barnyakov, Anton Poluektov, Vladimir Zhulanov, Alexey Maslennikov, G.A. Savinov, Yu.M. Glukhovchenko, A. N. Zhuravlev, A.K. Barladyan, V. M. Malyshev, Andrey Sokolov, I. I. Morozov, Ivan Ovtin, E.A. Kuper, E. A. Simonov, G. Yu. Kurkin, S.A. Kononov, A. R. Buzykaev, B. Shwartz, A.N. Skrinsky, Yu. A. Tikhonov, A.E. Bondar, Simon Eydelman, K. Yu Todyshev, Evgenii Baldin, V. V. Petrov, A.A. Ruban, G. V. Karpov, A. Bobrov, Sergey Sinyatkin, Pavel Piminov, Dmitry Shatilov, Sergey Karnaev, N. Yu. Muchnoi, V.G. Prisekin, Olga Rezanova, G.M. Tumaikin, I. B. Nikolaev, S.G. Pivovarov, Valery I. Telnov, V.K. Sandyrev, E.V. Starostina, A. Yu. Barnyakov, V. V. Kolmogorov, Yu. V. Usov, V. S. Bobrovnikov, S.B. Oreshkin, E. A. Kravchenko, A. P. Onuchin, V.V. Neufeld, D.N. Grigoriev, I. A. Kuyanov, S.A. Nikitin, V. M. Aulchenko, S.E. Baru, K.Yu. Kotov, A.G. Shamov, V. E. Blinov, Sergey Peleganchuk, A.M. Sukharev, V. F. Kulikov, Evgeny Levichev, Igor Bulyzhenkov, A. I. Vorobiov, Tatyana Kharlamova, A. E. Blinov, Anton Bogomyagkov, V. Kudryavtsev, D. V. Gusev, V.N. Zhilich, Oleg Meshkov, D. A. Maksimov, I.N. Okunev, S.V. Karpov, V. A. Kiselev, V. V. Gulevich, and V. A. Tayursky

Subjects
Physics, Optics, business.industry, Detector, business
Published
2014

23. 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

24. Measurement of R at KEDR

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Mathematics education
Abstract

The KEDR collaboration has taken data for R measurements at energies 3.1–3.7 GeV. Preliminary results from the analysis of these data are presented.

Published
2015

25. STUDY OF ψ(2S) → μ+μ- DECAY WITH KEDR DETECTOR

Author

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

Subjects
Nuclear physics, Physics, Particle physics, Luminosity (scattering theory), law, Detector, Collider, Value (mathematics), law.invention
Abstract

Since 2004 the KEDR detector at the VEPP-4M collider has taken several data sets in the ψ(2S) region, acquiring total luminosity of about 7 pb-1, which corresponds to more than 3.5 × 106ψ(2S). We report the preliminary value of Γee × Γμμ/Γ = 19.4 ± 0.4 ± 1.1 eV for ψ(2S).

Published
2014

26. PARAMETERS OF CHARMONIUM STATES FROM KEDR

Author

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

Subjects
Physics, Nuclear physics, Particle physics, Branching fraction, law, Detector, Collider, law.invention
Abstract

We report results of experiments performed with the KEDR detector at the VEPP-4M e+e- collider. They include final results for the mass and other parameters of the J/ψ, ψ(2S) and ψ(3770) and J/ψ → γηc branching fraction determination.

Published
2014

27. Measurement of ψ(3770) parameters

Author

A.E. Bondar, S.V. Karpov, Evgenii Baldin, A. Sokolov, D.N. Grigoriev, Sergey Sinyatkin, S.E. Baru, Pavel Piminov, A. E. Blinov, V. A. Kiselev, A. Bobrov, Sergey Peleganchuk, A.A. Ruban, G.M. Tumaikin, N. Yu. Muchnoi, I.B. Nikolaev, A. Yu. Barnyakov, V.N. Zhilich, A.N. Zhuravlev, V. V. Petrov, G.Ya. Kurkin, A.A. Osipov, S. I. Mishnev, A. P. Onuchin, E.A. Kuper, V.V. Gulevich, V.K. Sandyrev, I. O. Orlov, Tatyana Kharlamova, Oleg Meshkov, V.V. Kolmogorov, S.I. Eidelman, V.M. Aulchenko, A.S. Medvedko, K. Yu. Todyshev, I.Yu. Basok, A.K. Barladyan, E. A. Kravchenko, Evgeny Levichev, Anton Poluektov, A. N. Yushkov, A. R. Buzykaev, E. A. Simonov, V.A. Tayursky, Alexey Talyshev, S.A. Nikitin, Alexey Maslennikov, Dmitry Shatilov, G.A. Savinov, E.V. Starostina, V.F. Kulikov, I. I. Morozov, V.V. Anashin, Victor Bobrovnikov, Yu. A. Tikhonov, M.Yu. Barnyakov, S.A. Kononov, Yu. V. Usov, S.G. Pivovarov, D. V. Gusev, V. E. Blinov, A.G. Shamov, S.B. Oreshkin, A.N. Skrinsky, A.M. Sukharev, A.V. Bogomyagkov, V.V. Neufeld, V.G. Prisekin, D. A. Maksimov, I.N. Okunev, Valery I. Telnov, G.V. Karpov, A.I. Vorobiov, K.Yu. Kotov, O. L. Beloborodova, V. M. Malyshev, B.A. Shwartz, Vladimir Zhulanov, Yu.M. Glukhovchenko, Sergey Karnaev, and Victor Smaluk

Subjects
Physics, Nuclear and High Energy Physics, Partial width, Meson, law, Electron–positron annihilation, Form factor (quantum field theory), Resonance, Electron, Atomic physics, Collider, High Energy Physics - Experiment, law.invention
Abstract

We report the final results of a study of the ψ ( 3770 ) meson using a data sample collected with the KEDR detector at the VEPP-4M electron–positron collider. The data analysis takes into account interference between the resonant and nonresonant D D ¯ production, where the latter is related to the nonresonant part of the energy-dependent form factor F D . The vector dominance approach and several empirical parameterizations have been tried for the nonresonant F D N R ( s ) . Our results for the mass and total width of ψ ( 3770 ) are M = 3779.2 − 1.7 + 1.8 − 0.7 + 0.5 − 0.3 + 0.3 MeV , Γ = 24.9 − 4.0 + 4.6 − 0.6 + 0.5 − 0.9 + 0.2 MeV , where the first, second and third uncertainties are statistical, systematic and model, respectively. For the electron partial width two possible solutions have been found: ( 1 ) Γ e e = 154 − 58 + 79 − 9 + 17 − 25 + 13 eV , ( 2 ) Γ e e = 414 − 80 + 72 − 26 + 24 − 10 + 90 eV . Our statistics are insufficient to prefer one solution to another. The Solution (2) mitigates the problem of non- D D ¯ decays but is disfavored by potential models. It is shown that taking into account the resonance–continuum interference in the near-threshold region affects resonance parameters, thus the results presented cannot be directly compared with the corresponding PDG values obtained ignoring this effect.

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28. Recent results from the KEDR detector

Author

A.E. Bondar, E.A. Kuper, N. Yu. Muchnoi, Evgenii Baldin, E. A. Simonov, S.A. Nikitin, V. A. Kiselev, V.V. Kolmogorov, D.A. Maksimov, Alexey Talyshev, I. B. Nikolaev, I.N. Okunev, M.Yu. Barnyakov, Yu. A. Tikhonov, V. V. Petrov, S.A. Kononov, A.K. Barladyan, Alexey Maslennikov, S.V. Karpov, D.N. Grigoriev, V.V. Anashin, V.N. Zhilich, A. N. Yushkov, I.O. Orlov, G.A. Savinov, Sergey Karnaev, Sergey Sinyatkin, G.M. Tumaikin, Yu.M. Glukhovchenko, Oleg Meshkov, V.G. Prisekin, Valery I. Telnov, V.K. Sandyrev, A.N. Zhuravlev, I.I. Morozov, V.M. Aulchenko, Victor Smaluk, Pavel Piminov, A. E. Blinov, V.A. Tayursky, E. A. Kravchenko, B.A. Shwartz, Dmitry Shatilov, S.G. Pivovarov, Vladimir Zhulanov, G.V. Karpov, Yu. V. Usov, Victor Bobrovnikov, V. E. Blinov, A.I. Vorobiov, A. Yu. Barnyakov, A.G. Shamov, A.M. Sukharev, A.A. Osipov, S. I. Mishnev, A. P. Onuchin, A.N. Skrinsky, S.B. Oreshkin, Anton Poluektov, V.V. Gulevich, A.V. Bogomyagkov, A.A. Ruban, A.S. Medvedko, K. Yu. Todyshev, I.Yu. Basok, G.Ya. Kurkin, Tatyana Kharlamova, A. R. Buzykaev, V. Kudryavtsev, D. V. Gusev, Sergey Peleganchuk, Evgeny Levichev, S.E. Baru, A. Bobrov, V. M. Malyshev, E.V. Starostina, V.F. Kulikov, V.V. Neufeld, Andrey Sokolov, Semen Eidelman, K.Yu. Kotov, and O. L. Beloborodova

Subjects
Physics, Annihilation, Physics::Instrumentation and Detectors, QC1-999, Detector, Resonance, Engineering physics, law.invention, Nuclear physics, law, Physics::Accelerator Physics, High Energy Physics::Experiment, Collider
Abstract

We describe recent results from the KEDR detector at the VEPP-4Mcollider. They include: a search for narrow resonances between 1.85 and 3.1 GeV, a test of leptonic universality by comparing partial widths of the J/ψ resonance into electron and muon pairs, a determination of the main parameters of the ψ(2S) and a measurement of ψ(3770) parameters.

29. Recent results from the KEDR detector

Author

G.Ya. Kurkin, E. A. Kravchenko, I.N. Okunev, D. A. Maksimov, Alexey Talyshev, K. Yu. Todyshev, S.B. Oreshkin, E. A. Simonov, E. B. Levichev, M. Yu. Barnyakov, A. A. Osipov, V. F. Kulikov, S.A. Nikitin, A.A. Ruban, Evgenii Baldin, A. Sokolov, A. N. Yushkov, Alexey Buzykaev, V. A. Kiselev, A. Bobrov, Semen Eidelman, D. N. Shatilov, S.I. Mishnev, Anton Poluektov, Yu. A. Tikhonov, I. B. Nikolaev, V.N. Zhilich, Oleg Meshkov, E.V. Starostina, V. V. Gulevich, Victor Smaluk, A.K. Barladyan, V. V. Zhulanov, V. V. Petrov, V.S. Bobrovnikov, S.V. Karpov, V. V. Anashin, D. V. Gusev, K.Yu. Kotov, Yu. V. Usov, Vladimir Blinov, A. I. Vorobiov, S. V. Sinyatkin, O. L. Beloborodova, I. N. Popkov, A. E. Bondar, Alexey Maslennikov, V.K. Sandyrev, S.E. Baru, Sergey Karnaev, V. M. Malyshev, I. I. Morozov, G. M. Tumaikin, A.V. Bogomyagkov, I. Bedny, E.A. Kuper, A. Yu. Barnyakov, P. A. Piminov, G.A. Savinov, S.A. Kononov, A.N. Skrinsky, V. V. Neufeld, N. Yu. Muchnoi, A.M. Sukharev, Valery I. Telnov, Sergey Peleganchuk, A. P. Onuchin, A. N. Zhuravlev, V. M. Aulchenko, V.G. Prisekin, V. A. Tayursky, A. E. Blinov, Yu.M. Glukhovchenko, S.G. Pivovarov, A. S. Medvedko, Yu I. Skovpen, A.G. Shamov, B.A. Shwartz, I. O. Orlov, and Tatyana Kharlamova

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Meson, Physics::Instrumentation and Detectors, Detector, Resonance, FOS: Physical sciences, Astronomy and Astrophysics, law.invention, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), law, High Energy Physics::Experiment, Collider, Instrumentation
Abstract

We report results of experiments performed with the KEDR detector at the VEPP-4M e+e- collider. They include precise measurement of the D0 and D+- meson masses, determination of the psi(3770) resonance parameters, and a search for narrow resonances in e+e- annihilation at center-of-mass energies between 1.85 and 3.1 GeV., Comment: To be published in Proceedings of the PhiPsi09, Oct. 13-16, 2009, Beijing, China

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