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Start Over Author "E. A. Simonov" Topic nuclear and high energy physics
29 results on '"E. A. Simonov"'

1. Experiments with the KEDR Detector at the $${{e}^{ + }}{{e}^{ - }}$$ Collider VEPP-4M in the Energy Range $$\sqrt s $$ = 1.84–3.88 GeV

Author

V. V. Anashin, O. V. Anchugov, V. M. Aulchenko, S. A. Balashov, E. M. Baldin, G. N. Baranov, A. K. Barladyan, A. Yu. Barnyakov, M. Yu. Barnyakov, S. E. Baru, I. Yu. Basok, A. M. Batrakov, I. V. Bedny, E. A. Bekhtenev, A. E. Blinov, V. E. Blinov, A. V. Bobrov, V. S. Bobrovnikov, A. V. Bogomyagkov, A. E. Bondar, D. V. Bondarev, A. R. Buzykaev, P. B. Cheblakov, V. P. Cherepanov, V. L. Dorohov, S. I. Eidelman, S. A. Glukhov, Yu. M. Gluchovchenko, D. N. Grigoriev, V. R. Groshev, V. V. Gulevich, D. V. Gusev, V. V. Kaminskiy, S. E. Karnaev, G. V. Karpov, S. V. Karpov, K. Yu. Karyukina, D. P. Kashtankin, P. V. Kasyanenko, A. A. Katcin, T. A. Kharlamova, V. A. Kiselev, V. V. Kolmogorov, S. A. Kononov, K. A. Kotov, 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, A. S. Medvedko, O. I. Meshkov, S. I. Mishnev, I. A. Morozov, I. I. Morozov, N. Yu. Muchnoi, A. I. Naumenkov, V. V. Neufeld, S. A. Nikitin, I. B. Nikolaev, I. N. Okunev, A. P. Onuchin, S. B. Oreshkin, I. O. Orlov, A. A. Osipov, I. V. Ovtin, Yu. A. Pakhotin, S. V. Peleganchuk, S. S. Petrosyan, V. V. Petrov, P. A. Piminov, S. G. Pivovarov, N. A. Podgornov, A. O. Poluektov, A. A. Polunin, I. N. Popkov, G. E. Pospelov, I. Ya. Protopopov, V. G. Prisekin, O. L. Rezanova, A. A. Ruban, V. K. Sandyrev, G. A. Savinov, A. G. Shamov, D. N. Shatilov, L. I. Shekhtman, E. I. Shubin, D. A. Shvedov, B. A. Shwartz, V. A. Sidorov, E. A. Simonov, S. V. Sinyatkin, A. N. Skrinsky, V. V. Smaluk, A. V. Sokolov, E. V. Starostina, M. V. Struchalin, D. P. Sukhanov, A. M. Sukharev, 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, A. V. Zatsepin, V. N. Zhilich, A. A. Zhukov, V. V. Zhulanov, A. N. Zhuravlev, and A. N. Yushkov

Subjects
Nuclear and High Energy Physics
Published
2023

2. Measurement of the tensor analyzing power $$T_{20}$$ for the reaction $$\gamma d \rightarrow d\pi ^0$$

Author

E. V. Starostina, Eed M. Darwish, M. Ya. Kuzin, Yu. V. Shestakov, A. Yu. Loginov, D. M. Nikolenko, S. A. Zevakov, B. I. Vasilishin, R. Sh. Sadykov, A. V. Bogomyagkov, E. A. Simonov, V. A. Kiselev, Oleg Meshkov, M.I. Levchuk, V. V. Gauzshtein, Sergey Karnaev, Evgeny Levichev, Sergey Sinyatkin, Pavel Piminov, S. I. Mishnev, I. N. Okunev, A. N. Zhuravlev, D. K. Toporkov, and I. A. Rachek

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Nuclear Theory, Hadron, Photon energy, 01 natural sciences, Nuclear physics, Pion, Deuterium, 0103 physical sciences, Nuclear fusion, Tensor, Polar coordinate system, Nuclear Experiment, 010306 general physics, Storage ring
Abstract

We present the first accurate results of measurements of the tensor analyzing power component $$T_{20}$$ for the coherent neutral pion photoproduction on the deuteron. The measurements were performed at the Budker Institute of Nuclear Physics at VEPP-3 storage ring using the internal tensor polarized deuterium target. The measurements cover the region of photon energy from 200 to 450 MeV and the region of the center-of-mass pion polar angle from 100 to 140 degrees. The results obtained are compared with predictions of several theoretical models.

Published
2020

3. 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

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

Author

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

Subjects
Physics, Systematic error, Particle physics, Nuclear and High Energy 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
Abstract

Using the KEDR detector at the VEPP-4M e + e − e + e − collider, we have measured the values of R uds R uds 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% 3.3 % at most of energy points with a systematic uncertainty of about 2.1% 2.1 % . At the moment it is the most accurate measurement of R(s) R ( s ) in this energy range.

Published
2016

5. Measurements of the tensor analyzing power T20 of the reaction γd → dπ0

Author

Yu. V. Shestakov, R. Sh. Sadykov, E. V. Starostina, E. A. Simonov, M.I. Levchuk, A. V. Bogomyagkov, D. M. Nikolenko, Evgeny Levichev, V. V. Gauzshtein, D. K. Toporkov, A. N. Zhuravlev, Sergey Sinyatkin, Pavel Piminov, I. N. Okunev, A. Yu. Loginov, V. A. Tryasuchev, Oleg Meshkov, S. A. Zevakov, S. I. Mishnev, Sergey Karnaev, I. A. Rachek, B. I. Vasilishin, and V. A. Kiselev

Subjects
Physics, Nuclear and High Energy Physics, Photon, 010308 nuclear & particles physics, Nuclear Theory, General Physics and Astronomy, Power component, 01 natural sciences, Power (physics), Nuclear physics, Pion, Deuterium, 0103 physical sciences, Tensor, Nuclear Experiment, 010306 general physics, Nucleon
Abstract

The paper presents the results of measurements of the tensor analyzing power component [Formula: see text] for the coherent neutral pion photoproduction on the deuteron. The measurements were performed in the Budker Institute of Nuclear Physics using the internal tensor polarized deuterium target at VEPP-3 storage ring. The measurements covered the region of the photon energy 240 — 420[Formula: see text]MeV and the region of the center-of-mass pion polar angle 100–140[Formula: see text]. The results of measurements were compared with the calculations performed within frameworks of several theoretical models.

Published
2020

6. 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

7. 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

8. 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

9. 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

10. 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

11. 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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12. 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

13. 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

14. 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

15. Measurement of J/ψ → η c γ 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. V Bedny, O. L Beloborodova, 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, A. I Milstein, 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, 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. 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, Nuclear and High Energy Physics, Particle physics, Branching fraction, High Energy Physics::Phenomenology, Radiative decay, Astronomy and Astrophysics, Photon spectra, Measure (mathematics), law.invention, law, High Energy Physics::Experiment, Collider, Instrumentation
Abstract

We present a study of the inclusive photon spectra from 5.9 million J/psi decays collected with the KEDR detector at the VEPP-4M e+e- collider. We measure the branching fraction of radiative decay J/psi to eta_c gamma, eta_c width and mass. Our preliminary results are: M(eta_c) = 2979.4+-1.5+-1.9 MeV, G(eta_c) = 27.8+-5.1+-3.3 MeV, B(J/psi to eta_c gamma) = (2.34+-0.15+-0.40)%.

Published
2010

16. 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

17. 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

18. Absolute calibration of particle energy at VEPP-4M

Author

A. V. Bogomyagkov, V. G. Popov, Oleg Meshkov, V. E. Blinov, A.A. Polunin, Dmitry Shatilov, E. A. Simonov, Yu. A. Tikhonov, V. A. Kiselev, G.M. Tumaikin, S. I. Mishnev, S.A. Nikitin, I. Ya. Protopopov, B.V. Levichev, Evgeny Levichev, Sergey Karnaev, A. I. Naumenkov, and I. B. Nikolaev

Subjects
Physics, Nuclear and High Energy Physics, Meson, Physics::Instrumentation and Detectors, Hadron, Elementary particle, Fermion, Quarkonium, Resonance (particle physics), law.invention, Nuclear physics, law, Calibration, Physics::Accelerator Physics, High Energy Physics::Experiment, Collider, Instrumentation
Abstract

We have started a new series of experiments on a precise measurement of J/Ψ-, Ψ′- mesons and τ-lepton masses at VEPP-4M collider with KEDR detector. Features of the method used for an absolute particle energy calibration based on the resonance depolarization are described.

Published
2002

19. A detailed test of the CsI(Tℓ) calorimeter for BELLE with photon beams of energy between 20 MeV and 5.4 GeV

Author

B.A. Shwartz, N.I. Root, Moo Hyun Lee, D. N. Shatilov, N. Yu. Muchnoi, C. S. Park, K. Kazui, I. Ya. Protopopov, A.S. Kuzmin, Yu.A Pogorelov, G.Ya. Kezerashvili, B.S. Ahn, A. Bondar, H. Hayashii, A. I. Naumenkov, Yu. V. Usov, E. A. Simonov, Hee Joung Kim, K. Kaneyuki, A. Satpathy, V.M. Aulchenko, H. Ikeda, Y. Watanabe, Hiroyuki Sagawa, S. Noguchi, T. Tsukamoto, K. Tamai, K. Miyabayashi, L.V Romanov, H.K. Jang, V. N. Zhilich, Byung Gu Cheon, E. V. Kremyanskaya, V. G. Popov, M. Fukushima, T. H. Chu, A. Sidorov, and A. Yu Garmash

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Range (particle radiation), Photon, Calorimeter (particle physics), Measuring instrument, Photon energy, Nuclear Experiment, Instrumentation, Particle detector, Noise (radio), Semiconductor detector
Abstract

The results of a beam test of a prototype of the BELLE CsI(Tl) calorimeter are reported. The test used beams of photons with energies spanning the range from 20 MeV to 5.4 GeV, produced at ROKK-1M facility of the Budker Institute of Nuclear Physics. The single-counter energy-equivalent noise was measured to be ∼200 keV. The design goals for the energy resolution, e.g. 4% at 20 MeV and 1.7% at 5.4 GeV, were achieved using the sum of energy deposits in a 5×5 crystal matrices with a single crystal energy threshold of 0.5 MeV; the summed energy deposit measured in the array corresponds to 97±2% of the incident photon energy over the entire energy range. The average position resolution for 470 MeV energy photons was measured to be 8 mm.

Published
2000

20. Photofission of27Al nucleus in the quasi-deuteron region of photonuclear absorption

Author

R. Ya. Kezerashvili, N. Yu. Muchnoi, A. I. Naumenkov, E. A. Simonov, M L Terranova, O. A. P. Tavares, I. Ya. Protopopov, E de Paiva, and G.Ya. Kezerashvili

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, Fission, Nuclear Theory, Photofission, Fission product yield, Photon energy, Charged particle, Nuclear physics, Semi-empirical mass formula, Yield (chemistry), Physics::Accelerator Physics, Atomic physics, Nuclear Experiment
Abstract

Quasi-monochromatic photon beams of 108 MeV Compton-edge energy produced in the ROKK-1M facility at the storage ring VEPP-4M (BINP, Novosibirsk) and makrofol sheets as fission track detectors were used to measure the photofission yield of 27 Al. The fission yield was found to be .160 55 /b. From this result and previously measured 27 Al photofission yield at79 MeV end-point energy with the LADON apparatus, the trends of fission cross section and fissility have been obtained in the incident photon energy range 40-110 MeV. The present results and data for other intermediate-mass nuclei obtained with the same methodology indicate an increase of fissility with decreasing Z 2 =A as predicted by the liquid drop model for fissioning

Published
1999

21. 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

22. Study of characteristics of the BELLE CsI calorimeter prototype with a BINP tagged photon beam

Author

H. S. Ahn, H. Ikeda, A. Bondar, M.A Shubin, K. Kaneyuki, S. E. Karnaev, A. I. Naumenkov, D. Y. Kim, A. M. Milov, I. Ya. Protopopov, A. S. Dvoretsky, Yu. V. Usov, G.Ya. Kezerashvili, M. Fukushima, T.A. Purlatz, Y. Watanabe, E. A. Simonov, Hiroyuki Sagawa, L.V Romanov, H. Hayashii, Byung Gu Cheon, B. Schwartz, T. W. Park, A. Satpathy, T. Tsukamoto, A. Yu Garmash, K. Miyabayashi, V. N. Zhilich, N. Yu. Muchnoi, A.S. Kuzmin, K. Tamai, N.I. Root, S. Noguchi, A. Watanabe, Moo Hyun Lee, V.M. Aulchenko, and Y. Ohshima

Subjects
Physics, Nuclear and High Energy Physics, Photon, Calorimeter (particle physics), Physics::Instrumentation and Detectors, Preamplifier, Monte Carlo method, Noise (electronics), law.invention, Nuclear physics, law, Calibration, Physics::Accelerator Physics, High Energy Physics::Experiment, Nuclear Experiment, Collider, Instrumentation, Image resolution
Abstract

Results of the test of the BELLE barrel calorimeter prototype using a tagged photon beam are presented. The prototype consisted of 36 CsI(Tl) counters with the same preamplifiers and shapers as in the BELLE calorimeter. The measurements were carried out at the VEPP-4M collider with the tagged photon beam provided by the ROKK-1M facility. The energy resolution for photons was measured in the energy range 40–800 MeV. The achieved energy resolution was 3% for 40 MeV and 1.5% for 800 MeV photons. The results are consistent with the Monte Carlo simulation taking into account effects of the electronics noise.

Published
1998

23. The test of the LKr calorimeter prototype at the tagged photon beam

Author

E. A. Simonov, P. L. Frabetti, V. Speziali, A. Bondar, Francesco Lanni, Yu. A. Tikhonov, Yu.A Pogorelov, P.F. Manfredi, L.A. Leontiev, I. Ya. Protopopov, F. Palombo, A. M. Milov, L. Stagni, A. Sala, S.F. Ganzhur, G.Ya. Kezerashvili, D. N. Shatilov, G. E. Pospelov, S.G. Klimenko, Alexey Maslennikov, B. Maggi, P. Cantoni, V. S. Panin, A. P. Onuchin, V.M Malyshev, Sergey Peleganchuk, N. Yu. Muchnoi, A. G. Shamov, Valerio Re, and V.M. Aulchenko

Subjects
Physics, Nuclear and High Energy Physics, Photon, Physics::Instrumentation and Detectors, Resolution (electron density), Krypton, Bremsstrahlung, chemistry.chemical_element, Particle detector, Calorimeter, law.invention, Nuclear physics, chemistry, law, Physics::Accelerator Physics, High Energy Physics::Experiment, Collider, Instrumentation, Image resolution
Abstract

The experiment with the prototype of liquid krypton electromagnetic calorimeter for the KEDR detector is described. The experiment was carried out at the VEPP-4M collider at the tagged photon beam. The tagged photons were obtained in the energy region 50–625 MeV using the ROKK-1M facility. The edges of the bremsstrahlung spectra were used for the energy resolution measurement in the high-energy region up to 4500 MeV. The energy resolution comparable with the resolution of the best crystal calorimeters and the excellent spatial resolution (∼1 mm) have been obtained. The results are in good agreement with the Monte-Carlo simulation.

Published
1997

24. Study of the BELLE CsI calorimeter prototype with the BINP tagged photon beam

Author

E. A. Simonov, A. I. Naumenkov, N.I. Root, G.Ya. Kezerashvili, B.A. Shwartz, Hiroyuki Sagawa, M. Fukushima, S.G. Klimenko, I. Ya. Protopopov, A. M. Milov, I.I Ivanov, A. Yu Garmash, H. Hayashii, N. Yu. Muchnoi, Yu. V. Usov, L.V Romanov, A.S. Kuzmin, M.A Shubin, K Miayabayashi, T.A. Purlatz, A. Bondar, K. Kaneyuki, Y Oshima, S. E. Karnaev, V. N. Zhilich, H. Ikeda, V.M. Aulchenko, K. Tamai, and Moo Hyun Lee

Subjects
Physics, Nuclear and High Energy Physics, Photon, Physics::Instrumentation and Detectors, Particle detector, law.invention, Calorimeter, Nuclear physics, law, Scintillation counter, Measuring instrument, Physics::Accelerator Physics, High Energy Physics::Experiment, Photon beam, Collider, Gamma detection, Instrumentation
Abstract

The results of the BELLE barrel calorimeter prototype test with the tagged photon beam are presented. The prototype consisted of 36 CsI(Tl) counters with the same readout system as the BELLE calorimeter. The measurements were carried out at the VEPP-4 collider with the tagged photon beam provided by the ROKK-1M facility. The energy resolution for photons was measured in the energy range 40–800 MeV. The results are in good agreement with the Monte-Carlo simulation.

Published
1996

25. Fissility of Bi, Pb, Au, Pt, W, Ta, V and Ti nuclei measured with 100 MeV Compton backscattered photons

Author

V. V. Petrov, N. Yu. Muchnoi, A. I. Naumenkov, G.Ya. Kezerashvili, E de Paiva, E. A. Simonov, A. M. Milov, O A P Tavares, V. A. Kiselev, M L Terranova, E L Moreira, and I. Ya. Protopopov

Subjects
Nuclear reaction, Nuclear physics, Physics, Elastic scattering, Nuclear and High Energy Physics, Fissility, Photon, Fission, Photofission, Compton scattering, Atomic physics, Photon energy, Nuclear Experiment
Abstract

Photofission cross sections of and nuclei have been measured at an incident photon energy of 100 MeV using monochromatic photons produced by Compton backscattering at the ROKK-1M facility (BINP, Novosibirsk). Detection of fission fragments has been performed by means of Makrofol track-etch detectors in close contact with metallic foils of the target elements. The values of fissility at 100 MeV deduced for the targets under investigation are found to range between and . The present results show consistency with the fissility trends calculated for 69 and 600 MeV monoenergetic photons using a formalism based on the current two-step model for intermediate-energy photofission reactions.

Published
1996

26. New precision measurement of the J/ψ- and ψʹ-meson masses

Author

Evgenii Baldin, D.V. Bondarev, S.E. Baru, Yu. A. Pakhotin, Evgeny Levichev, S. A. Balashov, I. B. Nikolaev, V.R. Groshev, Alexey Maslennikov, A. V. Zatsepin, V.N. Zhilich, Oleg Meshkov, V. V. Petrov, Valery I. Telnov, Sergey Peleganchuk, A. P. Onuchin, A. I. Naumenkov, A. R. Buzykaev, A. I. Shusharo, A. Bondar, S. S. Petrosyan, V.M. Aulchenko, N. Yu. Muchnoi, S.A. Kononov, K. Yu Todyshev, S. E. Mishnev, V.A. Tayursky, Sergey Karnaev, I. Bedny, K. A. Kotov, Olga Beloborodova, E. V. Kremyanskaya, A.G. Shamov, V.A. Sidorov, V. E. Blinov, A.A. Polunin, M.Yu. Barnyakov, A.I. Vorobiov, S.I. Eidelman, Andrey Soukharev, G.M. Tumaikin, A. V. Bogomyagkov, A.N. Skrinsky, Yu. V. Usov, V. A. Kiselev, E. A. Kravchenko, A. N. Yushkov, G.A. Savinov, A. E. Blinov, V. M. Malyshev, S.B. Oreshkin, E. A. Simonov, S.A. Nikitin, Yu. A. Tikhonov, Dmitry Shatilov, G. E. Pospelov, Alexey Talyshev, Yu I. Skovpen, Anton Poluektov, I. Ya. Protopopov, and B.A. Shwartz

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Accuracy and precision, Observational error, Meson, Electron–positron annihilation, Detector, Mass measurement, Absolute calibration, High Energy Physics - Experiment, law.invention, Nuclear physics, Error analysis, law, Calibration, Physics::Accelerator Physics, High Energy Physics::Experiment, Collider, Beam energy
Abstract

A new high precision measurement of the $J/\psi$- and $\psi'$-meson masses has been performed at the VEPP-4M collider using the KEDR detector. The resonant depolarization method has been employed for the absolute calibration of the beam energy. The following mass values have been obtained: $M_{J/\psi} = 3096.917 \pm 0.010 \pm 0.007$ MeV, $M_{\psi'} = 3686.111 \pm 0.025 \pm 0.009$ MeV. The relative measurement accuracy has reached $4. 10^{-6}$ for $J/\psi$ and $7. 10^{-6}$ for $\psi'$, approximately 3 times better than in the previous precise experiments., Comment: 12 pages, 4 tables, 10 figures

Published
2004

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. Delbrück scattering at energies of 140-450 MeV

Author

E. A. Simonov, Dmitry Shatilov, Yu. A. Tikhonov, V. S. Panin, Sh. Zh. Akhmadaliev, A. I. Milstein, V. G. Popov, A.G. Shamov, A. M. Milov, G. E. Pospelov, S.G. Klimenko, I. Ya. Protopopov, G.Ya. Kezerashvili, V. M. Malyshev, Sergey Peleganchuk, A. I. Naumenkov, Alexey Maslennikov, L.V Romanov, and N. Yu. Muchnoi

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Delbrück scattering, High Energy Physics::Experiment, High Energy Physics - Experiment
Abstract

The differential cross section of Delbr\"{u}ck scattering is measured on a bismuth germanate $Bi_4Ge_3O_{12}$ target at photon energies $140 - 450 MeV$ and scattering angles $2.6 - 16.6 mrad$. A good agreement with the theoretical results, obtained exactly in a Coulomb field, is found., Comment: 6 pages, revtex, 12 figures, 2 tables

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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