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1. Measurement of the branching fraction of J/ψ → ρπ at KEDR

Author

The KEDR collaboration, V. V. Anashin, O. V. Anchugov, A. V. Andrianov, K. V. Astrelina, V. M. Aulchenko, E. M. Baldin, G. N. Baranov, A. K. Barladyan, A. Yu. Barnyakov, M. Yu. Barnyakov, I. Yu. Basok, A. M. Batrakov, E. A. Bekhtenev, O. V. Belikov, D. E. Berkaev, A. E. Blinov, V. E. Blinov, M. F. Blinov, A. V. Bobrov, V. S. Bobrovnikov, A. V. Bogomyagkov, D. Yu. Bolkhovityanov, A. E. Bondar, A. R. Buzykaev, P. B. Cheblakov, V. L. Dorohov, F. A. Emanov, V. V. Gambaryan, D. N. Grigoriev, V. V. Kaminskiy, S. E. Karnaev, G. V. Karpov, S. V. Karpov, K. Yu. Karukina, D. P. Kashtankin, P. V. Kasyanenko, A. A. Katcin, T. A. Kharlamova, V. A. Kiselev, S. A. Kononov, A. A. Krasnov, E. A. Kravchenko, V. N. Kudryavtsev, V. F. Kulikov, I. A. Kuyanov, E. B. Levichev, P. V. Logachev, D. A. Maksimov, Yu. I. Maltseva, V. M. Malyshev, A. L. Maslennikov, O. I. Meshkov, S. I. Mishnev, I. A. Morozov, I. I. Morozov, D. A. Nikiforov, S. A. Nikitin, I. B. Nikolaev, I. N. Okunev, S. B. Oreshkin, A. A. Osipov, I. V. Ovtin, A. V. Pavlenko, S. V. Peleganchuk, P. A. Piminov, N. A. Podgornov, V. G. Prisekin, O. L. Rezanova, A. A. Ruban, G. A. Savinov, A. G. Shamov, L. I. Shekhtman, D. A. Shvedov, B. A. Shwartz, E. A. Simonov, S. V. Sinyatkin, A. N. Skrinsky, A. V. Sokolov, E. V. Starostina, 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, V. N. Zhilich, A. A. Zhukov, V. V. Zhulanov, and A. N. Zhuravlev

Subjects
e +-e − Experiments, Particle and Resonance Production, Quarkonium, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract We present the study of the decay J/ψ → ρπ. The results are based on of 5.2 million J/ψ events collected by the KEDR detector at the VEPP-4M collider. The branching fractions are measured to be B $$ \mathcal{B} $$ (J/ψ → ρπ) = (2.072 ± 0.017 ± 0.062) ∙ 10 −2 and B $$ \mathcal{B} $$ (J/ψ → π + π − π 0) = (1.878 ± 0.013 ± 0.051) ∙ 10 −2, where the first uncertainties are statistical and the second systematic. Our results are more precise than the previous relative measurements.

Published
2023
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2. Measurement of $$J/\psi $$ J / ψ decays into final states $$2(\pi ^{+}\pi ^{-})\pi ^{0},K^{+}K^{-}\pi ^{+}\pi ^{-}\pi ^{0},\,2(\pi ^{+}\pi ^{-})$$ 2 ( π + π - ) π 0 , K + K - π + π - π 0 , 2 ( π + π - ) and $$K^{+}K^{-}\pi ^{+}\pi ^{-}$$ K + K - π + π

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, S. A. Glukhov, D. N. Grigoriev, V. V. Kaminskiy, S. E. Karnaev, G. V. Karpov, S. V. Karpov, K. Yu. Karukina, D. P. Kashtankin, A. A. Katsin, 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, E. A. Kuper, 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, 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, P. A. Piminov, S. G. Pivovarov, V. G. Prisekin, O. L. Rezanova, A. A. Ruban, V. K. Sandyrev, G. A. Savinov, A. G. Shamov, D. N. Shatilov, L. I. Shekhtman, D. A. Shvedov, B. A. Shwartz, E. A. Simonov, S. V. Sinyatkin, A. N. Skrinsky, A. V. Sokolov, E. V. Starostina, 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, V. N. Zhilich, A. A. Zhukov, V. V. Zhulanov, and A. N. Zhuravlev

Subjects
Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract Using the 1.32 $$\hbox {pb}^{-1}$$ pb - 1 statistics collected at the $$J/\psi $$ J / ψ peak with the KEDR detector at the VEPP-4M $$e^{+}e^{-\, }$$ e + e - collider, we measured the branching fractions of $$J/\psi $$ J / ψ meson decays to the final states 2( $$\pi ^{+}\pi ^{-})\pi ^{0}$$ π + π - ) π 0 , $$K^{+}K^{-}\pi ^{+}\pi ^{-}\pi ^{0}$$ K + K - π + π - π 0 , 2( $$\pi ^{+}\pi ^{-})$$ π + π - ) and $$K^{+}K^{-}\pi ^{+}\pi ^{-}$$ K + K - π + π - . The results obtained for the decays $$J/\psi \rightarrow $$ J / ψ → 2( $$\pi ^{+}\pi ^{-})\pi ^{0}$$ π + π - ) π 0 , $$J/\psi \rightarrow K^{+}K^{-}\pi ^{+}\pi ^{-}\pi ^{0}$$ J / ψ → K + K - π + π - π 0 contradict the measurements performed by other groups in the last century, but agree well with recent results of BABAR and BESIII collaborations.

Published
2022
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3. Determination of technological parameters of rock freezing systems based on the condition of maintaining design thickness of ice wall

Author

M. A. Semin, A. V. Bogomyagkov, and L. Y. Levin

Subjects
construction, mine shaft, rocks, groundwater, freezing, ice wall, thermotechnical calculation, modeling, process parameters, freezing column, emergency mode, Mining engineering. Metallurgy, TN1-997
Abstract

Artificial freezing ensures the formation of a temporary ice wall around the shaft under construction, which prevents groundwater penetration into the shaft and increases the strength of rocks around the unsupported walls of the shaft until the permanent support is erected. The purpose of the study is to carry out thermotechnical calculation of ice wall with subsequent theoretical analysis of changing ice wall thickness with shifting to the passive freezing stage. The idea of the study is to determine these technological parameters based on the condition of maintaining the design ice wall thickness at the stage of passive freezing. The methodology and results of thermotechnical calculation of ice wall for the clay layer as applied to the case of the shafts under construction of a potash mine in the Republic of Belarus are presented. The thermal calculation of the ice wall was carried out numerically in the ANSYS software package using the finite element method. The findings of the numerical multiparameter modeling allowed theoretical analysis of ice wall thickness decrease with shifting to the passive freezing stage with higher brine temperature. The decrease in ice wall thickness was studied both during normal operation of the freezing station and at emergency operation mode caused by the failure of one of the freezing columns. Special attention in the analysis was paid to studying the influence of the duration of the active freezing stage and the distance between the columns on the decrease in the ice wall thickness. When analyzing changes in ice wall thickness at different distances between the freezing columns, it was found that the most common column spacing in the range from 1.1 to 1.3 m requires observing restrictions on the duration of active freezing to prevent a critical decrease in ice wall thickness during the passive freezing stage or decreasing the distance between the freezing columns. In this case, preservation of positive dynamics of ice wall thickness growth is ensured. For the clay layer considered in the study and the distance between the columns from 1.1 to 1.3 m, the minimum time of active freezing is also about 4.3 months. As a result of the analysis, the technological parameters of the freezing system (duration of the active freezing stage and the distance between the freezing columns) were determined, at which the ice wall thickness at the passive freezing stage did not become lower than the minimum permissible values calculated based on the strength and creep conditions.

Published
2021
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4. Addendum to: Measurement of Γee(J/ψ) with KEDR detector

Author

V. V. Anashin, V. M. Aulchenko, E. M. Baldin, A. K. Barladyan, A. Y. Barnyakov, M. Y. Barnyakov, S. E. Baru, I. V. Bedny, 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, Y. 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. Y. Kotov, E. A. Kravchenko, V. F. Kulikov, G. Y. 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. Y. 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, 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, Y. 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, Y. A. Tikhonov, K. Y. Todyshev, G. M. Tumaikin, Y. V. Usov, A. I. Vorobiov, A. N. Yushkov, V. N. Zhilich, V. V. Zhulanov, and A. N. Zhuravlev

Subjects
Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

The electronic width of the J/ψ meson and its product by the branching fractions of J/ψ meson decay to hadrons and electrons measured with the KEDR detector at the VEPP-4M e + e − collider have been reported in ref. [1].

Published
2020
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5. 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

7. Theoretical analysis of frozen wall dynamics during transition to ice holding stage

Author

Mikhail A. Semin, Lev Yu. Levin, and Aleksandr V. Bogomyagkov

Subjects
frozen wall, stefan problem, mathematical modeling, artificial rock freezing, technological parameters, freezing system, freezing column, Mining engineering. Metallurgy, TN1-997
Abstract

Series of calculations for the artificial freezing of the rock mass during construction of mineshafts for the conditions of a potash mine in development was carried out. Numerical solution was obtained through the finite element method using ANSYS software package. Numerical dependencies of frozen wall thickness on time in the ice growing stage and ice holding stage are obtained for two layers of the rock mass with different thermophysical properties. External and internal ice wall boundaries were calculated in two ways: by the actual freezing temperature of pore water and by the temperature of –8 °С, at which laboratory measurements of frozen rocks' strength were carried out. Normal operation mode of the freezing station, as well as the emergency mode, associated with the failure of one of the freezing columns, are considered. Dependence of a decrease in frozen wall thickness in the ice holding stage on the duration of the ice growing stage was studied. It was determined that in emergency operation mode of the freezing system, frozen wall thickness by the –8 °C isotherm can decrease by more than 1.5 m. In this case frozen wall thickness by the isotherm of actual freezing of water almost always maintains positive dynamics. It is shown that when analyzing frozen wall thickness using the isotherm of actual freezing of pore water, it is not possible to assess the danger of emergency situations associated with the failure of freezing columns.

Published
2020
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8. Determination of technological parameters of rock freezing systems based on the condition of maintaining design thickness of ice wall

Author

Lev Levin, M. A. Semin, and A. V. Bogomyagkov

Subjects
construction, ice wall, Materials science, Mining engineering. Metallurgy, Process Chemistry and Technology, process parameters, TN1-997, Geology, modeling, emergency mode, Geotechnical Engineering and Engineering Geology, freezing, rocks, Industrial and Manufacturing Engineering, thermotechnical calculation, freezing column, groundwater, Geotechnical engineering, mine shaft
Abstract

Artificial freezing ensures the formation of a temporary ice wall around the shaft under construction, which prevents groundwater penetration into the shaft and increases the strength of rocks around the unsupported walls of the shaft until the permanent support is erected. The purpose of the study is to carry out thermotechnical calculation of ice wall with subsequent theoretical analysis of changing ice wall thickness with shifting to the passive freezing stage. The idea of the study is to determine these technological parameters based on the condition of maintaining the design ice wall thickness at the stage of passive freezing. The methodology and results of thermotechnical calculation of ice wall for the clay layer as applied to the case of the shafts under construction of a potash mine in the Republic of Belarus are presented. The thermal calculation of the ice wall was carried out numerically in the ANSYS software package using the finite element method. The findings of the numerical multiparameter modeling allowed theoretical analysis of ice wall thickness decrease with shifting to the passive freezing stage with higher brine temperature. The decrease in ice wall thickness was studied both during normal operation of the freezing station and at emergency operation mode caused by the failure of one of the freezing columns. Special attention in the analysis was paid to studying the influence of the duration of the active freezing stage and the distance between the columns on the decrease in the ice wall thickness. When analyzing changes in ice wall thickness at different distances between the freezing columns, it was found that the most common column spacing in the range from 1.1 to 1.3 m requires observing restrictions on the duration of active freezing to prevent a critical decrease in ice wall thickness during the passive freezing stage or decreasing the distance between the freezing columns. In this case, preservation of positive dynamics of ice wall thickness growth is ensured. For the clay layer considered in the study and the distance between the columns from 1.1 to 1.3 m, the minimum time of active freezing is also about 4.3 months. As a result of the analysis, the technological parameters of the freezing system (duration of the active freezing stage and the distance between the freezing columns) were determined, at which the ice wall thickness at the passive freezing stage did not become lower than the minimum permissible values calculated based on the strength and creep conditions.

Published
2021

9. Measurement of $$J/\psi $$ decays into final states $$2(\pi ^{+}\pi ^{-})\pi ^{0},K^{+}K^{-}\pi ^{+}\pi ^{-}\pi ^{0},\,2(\pi ^{+}\pi ^{-})$$ and $$K^{+}K^{-}\pi ^{+}\pi ^{-}$$

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, S. A. Glukhov, D. N. Grigoriev, V. V. Kaminskiy, S. E. Karnaev, G. V. Karpov, S. V. Karpov, K. Yu. Karukina, D. P. Kashtankin, A. A. Katsin, 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, E. A. Kuper, 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, 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, P. A. Piminov, S. G. Pivovarov, V. G. Prisekin, O. L. Rezanova, A. A. Ruban, V. K. Sandyrev, G. A. Savinov, A. G. Shamov, D. N. Shatilov, L. I. Shekhtman, D. A. Shvedov, B. A. Shwartz, E. A. Simonov, S. V. Sinyatkin, A. N. Skrinsky, A. V. Sokolov, E. V. Starostina, 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, V. N. Zhilich, A. A. Zhukov, V. V. Zhulanov, and A. N. Zhuravlev

Subjects
Physics and Astronomy (miscellaneous), Engineering (miscellaneous)
Abstract

Using the 1.32 $$\hbox {pb}^{-1}$$ pb - 1 statistics collected at the $$J/\psi $$ J / ψ peak with the KEDR detector at the VEPP-4M $$e^{+}e^{-\, }$$ e + e - collider, we measured the branching fractions of $$J/\psi $$ J / ψ meson decays to the final states 2($$\pi ^{+}\pi ^{-})\pi ^{0}$$ π + π - ) π 0 , $$K^{+}K^{-}\pi ^{+}\pi ^{-}\pi ^{0}$$ K + K - π + π - π 0 , 2($$\pi ^{+}\pi ^{-})$$ π + π - ) and $$K^{+}K^{-}\pi ^{+}\pi ^{-}$$ K + K - π + π - . The results obtained for the decays $$J/\psi \rightarrow $$ J / ψ → 2($$\pi ^{+}\pi ^{-})\pi ^{0}$$ π + π - ) π 0 , $$J/\psi \rightarrow K^{+}K^{-}\pi ^{+}\pi ^{-}\pi ^{0}$$ J / ψ → K + K - π + π - π 0 contradict the measurements performed by other groups in the last century, but agree well with recent results of BABAR and BESIII collaborations.

Published
2022

10. ON THE AMBIGUITY OF INTERPRETATION OF THE TEMPERATURE FIELD OF THE FROZEN ROCK MASS USING BOREHOLE THERMOMETRY

Author

Mikhail A. Semin, Lev Yu. Levin, Alexander V. Bogomyagkov, and Aleksey V. Pugin

Subjects
artificial freezing of rocks, control boreholes, thermal conductivity of rocks, mathematical modeling, TA703-712, inverse stefan problem, Engineering geology. Rock mechanics. Soil mechanics. Underground construction, frozen wall, Physics::Geophysics
Abstract

The relevance. Sinking vertical mine shafts using artificial ground freezing requires controlling the state of the frozen wall formed around the shaft under construction. The most widespread and informative method of experimental control of the frozen wall state is borehole thermometry. The borehole thermometry data is used to adjust the parameters of the model (thermophysical properties of rocks) to re-create the temperature field in the entire volume of the frozen rock mass by means of mathematical modeling. Adjustment of the model parameters under certain conditions can lead to ambiguity in determining the model parameters, the reason for which is currently not studied. The main aim is to study the conditions for ambiguity occurrence in the calculated thermophysical properties of the rock mass as a result of the adjusting the parameters of the model according to the measurement data in the control boreholes. The object of the research is a frozen water-saturated rock mass around two mine shafts of the potash mine of the Nezhinsky mining and processing complex under construction. Research methods included the collection and processing of borehole thermometry data, the formulation of a mathematical model of heat transfer in the frozen rock mass, the numerical solution of the direct and inverse Stefan problems and the theoretical interpretation of the mismatch between the measured and calculated temperatures of the rocks. Results. We studied the mismatch between the measured and numerically calculated temperatures in the control boreholes on the phase plane of the adjusted parameters of the model – the thermal conductivities of frozen and unfrozen rocks. It is shown that the minimum of the mismatch functional under certain conditions moves over time or is not unique. The analysis of the arising ambiguity is carried out on the basis of a simplified mathematical model of the heat balance at the boundary of the phase transition front. It was found that at the ice growing stage, an unreliable determination of thermal conductivity in the frozen rock is possible due to the high temperature gradient in the rock mass near the control boreholes and the error of borehole inclinometry. At the ice holding stage, an unreliable determination of both thermal conductivities is possible, since the solution of the problem depends mainly on their ratio.

Published
2021

11. Measurement of the tensor analyzing power component T20 for the incoherent neutral-pion photoproduction on a deuteron

Author

B. I. Vasilishin, A. I. Fix, V. V. Gauzshtein, E. M. Darwish, M. Ya. Kuzin, M. I. Levchuk, A. Yu. Loginov, D. M. Nikolenko, I. A. Rachek, Yu. V. Shestakov, D. K. Toporkov, A. V. Yurchenko, S. A. Zevakov, A. V. Bogomyagkov, A. N. Zhuravlev, S. E. Karnaev, V. A. Kiselev, E. B. Levichev, O. I. Meshkov, S. I. Mishnev, I. N. Okunev, P. A. Piminov, E. A. Simonov, S. V. Sinyatkin, and E. V. Starostina

Published
2022

12. THE APPLICA TION OF 'FROZEN WALL ' SOFTWARE IN SIMULA TION OF ARTIFICIAL GROUND FREEZING

Author

Lev Levin, O.S. Parshakov, A. V. Bogomyagkov, and M.A. Semin

Subjects
Ground freezing, Software, business.industry, Geotechnical engineering, business, computer, Geology, Simula, computer.programming_language
Abstract

The paper presents general information about the software application “Frozen Wall ”, which was designed to simulate frozen wall formation around constructed vertical shafts. The main feature of the developed application is the possibility of calibrating the mathematical model for the best fit with the experimental temperature measurements by numerical solution of the inverse Stefan problem. In addition, it takes into account a number of technological processes that affect the state of the frozen wall. Based on calculations performed in the application, it is possible to develop technical measures aimed at ensuring the efficiency of mine shafts construction in difficult hydrogeological conditions.

Published
2019

13. Concept of an Electron–Positron Collider for Production and Study of the (μ+μ–) Bound State

Author

Sergey Sinyatkin, V. P. Druzhinin, Evgeny Levichev, A. V. Bogomyagkov, and A. I. Mil’shtein

Subjects
Physics, Nuclear and High Energy Physics, Radiation, Meson, 010308 nuclear & particles physics, Electron, 01 natural sciences, Atomic and Molecular Physics, and Optics, law.invention, Nuclear physics, Positron, law, 0103 physical sciences, Atom, Bound state, Physics::Accelerator Physics, High Energy Physics::Experiment, Radiology, Nuclear Medicine and imaging, 010306 general physics, Collider
Abstract

The possibility of producing and studying thus far unobserved dimuonium atoms (μ+μ−) using low-energy colliding е+е− beams is considered. Possible collider implementations are discussed, processes affecting its efficiency are investigated, and its parameters are estimated. The collider can probably also be used for high-luminosity experiments on the study of π± and η mesons.

Published
2018

14. 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

15. Manufacture of Wear-Resistant Cast-Iron Grinding Balls without Shrinkage Defects

Author

E. V. Matygullina, K. V. Sharov, Timur Rizovich Ablyaz, D. O. Pustovalov, and A. V. Bogomyagkov

Subjects
Manufacturing technology, Materials science, Casting (metalworking), Mechanical Engineering, Metallurgy, engineering, Numerical modeling, Wear resistant, Cast iron, engineering.material, Industrial and Manufacturing Engineering, Grinding, Shrinkage
Abstract

A manufacturing technology has been developed for wear-resistant cast-iron grinding balls without shrinkage defects. In this method, the balls are cast in single-use sand–clay molds. A new approach to designing the casting system is developed. By numerical modeling, the time dependence of solidification is derived. As a trial, grinding balls are produced by the proposed technology.

Published
2019

16. Multitier Straight-Sprue Casting System

Author

A. A. Shumkov, K. V. Sharov, D. O. Pustovalov, A. V. Bogomyagkov, Timur Rizovich Ablyaz, and V. I. Vasenin

Subjects
Materials science, business.industry, Mechanical Engineering, Nozzle, Mechanical engineering, Industrial and Manufacturing Engineering, Volumetric flow rate, Sprue, Metal flow, Software, Casting (metalworking), Component (UML), Engineering design process, business
Abstract

A method is proposed for calculating the geometric characteristics of a multitier straight-sprue casting system. In the system, the flow rate is adjusted by means of a nozzle in the upper part of the sprue. As an example, the casting system for the production of a specific component (a housing) is calculated. ProCAST software is used for modeling. multitier casting system, sprue, feeder, metal flow rate

Published
2019

17. Predicting Metallic Defects in Casting BrA9ZhZL Alloy Tool Electrodes

Author

K. V. Sharov, Timur Rizovich Ablyaz, E. V. Matygullina, A. A. Shumkov, D. O. Pustovalov, Nikita Vladimirovich Trapeznikov, A. V. Bogomyagkov, and Karim Ravilevich Muratov

Subjects
Materials science, Mechanical Engineering, Alloy, chemistry.chemical_element, Fusible alloy, engineering.material, medicine.disease_cause, Copper, Industrial and Manufacturing Engineering, chemistry, Casting (metalworking), Mold, visual_art, Electrode, engineering, medicine, visual_art.visual_art_medium, Ceramic, Composite material, Shrinkage
Abstract

A method is proposed for modeling the lost-wax casting of tool electrodes by means of fusible BrA9ZhZL copper-based alloy. The functionality of the casting system is analyzed. The heating and cooling of a ceramic mold is taken into account in visualizing the temperature fields. Sections where shrinkage pores may form in the casting are identified.

Published
2019

18. Investigation of the work of the P‑shaped gating system

Author

V. I. Vasenin and A. V. Bogomyagkov

Subjects
Microbiology (medical), Work (thermodynamics), Materials science, Immunology, Fluid dynamics, Immunology and Allergy, Mechanical engineering, Flow coefficient, Geotechnical engineering, Resistance coefficient, Gating
Published
2017

19. Investigation of the operation of a ring-shaped gating system

Author

A. V. Bogomyagkov and V. I. Vasenin

Subjects
Microbiology (medical), Materials science, Control theory, Immunology, Immunology and Allergy, Flow coefficient, Zero-point energy, Resistance coefficient, Mechanics, Gating, Ring (chemistry)
Published
2016

20. Projects for ultra-high-energy circular colliders at CERN

Author

Sergey Sinyatkin, Pavel Piminov, A. V. Bogomyagkov, Katsunobu Oide, Ivan Koop, M. Benedict, Dmitry Shatilov, Evgeny Levichev, and Frank Zimmermann

Subjects
Nuclear and High Energy Physics, High energy, Particle physics, Physics::Instrumentation and Detectors, Hadron, 01 natural sciences, Future Circular Collider, law.invention, Nuclear physics, Condensed Matter::Materials Science, law, 0103 physical sciences, Physics::Atomic and Molecular Clusters, Radiology, Nuclear Medicine and imaging, 010306 general physics, Collider, Physics, Radiation, Luminosity (scattering theory), Large Hadron Collider, 010308 nuclear & particles physics, Atomic and Molecular Physics, and Optics, Design study, Physics::Accelerator Physics, High Energy Physics::Experiment, Lepton
Abstract

Within the Future Circular Collider (FCC) design study launched at CERN in 2014, it is envisaged to construct hadron (FCC-hh) and lepton (FCC-ee) ultra-high-energy machines aimed to replace the LHC upon the conclusion of its research program. The Budker Institute of Nuclear Physics is actively involved in the development of the FCC-ee electron–positron collider. The Crab Waist (CR) scheme of the collision region that has been proposed by INP and will be implemented at FCC-ee is expected to provide high luminosity over a broad energy range. The status and development of the FCC project are described, and its parameters and limitations are discussed for the lepton collider in particular.

Published
2016

21. Beam optics and dynamics in electron storage rings with ultralow emittance

Author

K. Yu. Karyukina, A. V. Bogomyagkov, G.N. Baranov, Sergey Sinyatkin, Pavel Piminov, and Evgeny Levichev

Subjects
Physics, Diffraction, Nuclear and High Energy Physics, Radiation, Magnetic structure, 010308 nuclear & particles physics, business.industry, Synchrotron radiation, 01 natural sciences, Atomic and Molecular Physics, and Optics, Dynamic aperture, Wavelength, Optics, 0103 physical sciences, Physics::Accelerator Physics, Radiology, Nuclear Medicine and imaging, Thermal emittance, 010306 general physics, business, Energy (signal processing)
Abstract

Due to recent advances in the physics and technology of relativistic circular colliders, it is now possible to design storage rings whose emittance is close to the diffraction threshold of synchrotron radiation (e ~ 10 pm for the radiation critical wavelength of λ c ~ 1A). Methods for minimizing emittance by optimizing the magnetic structure without reducing the dynamic aperture and the energy acceptance, as well as possible implementations of these methods, are discussed in this paper.

Published
2016

22. Dynamic aperture limitation in e+e− colliders due to synchrotron radiation in quadrupoles

Author

A. V. Bogomyagkov, S. Glukhov, Sergey Sinyatkin, and Evgeny Levichev

Subjects
Physics, Nuclear and High Energy Physics, Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, Oscillation, Synchrotron radiation, Resonance, Surfaces and Interfaces, Betatron, 01 natural sciences, Dynamic aperture, Radiation damping, Quantum electrodynamics, 0103 physical sciences, Physics::Accelerator Physics, Parametric oscillator, 010306 general physics, Storage ring
Abstract

In a lepton storage ring of very high energy (e.g., in the e+e- Higgs factory) synchrotron radiation from quadrupoles constrains transverse dynamic aperture even in the absence of any magnetic nonlinearities. This was observed in tracking for LEP and the Future Circular e+e- Collider (FCC-ee). Here we describe a new mechanism of instability created by modulation of the particle energy at the double betatron frequency by synchrotron radiation in the quadrupoles. Energy modulation varies transverse focusing strength at the same frequency and creates a parametric resonance of the betatron oscillations with unusual properties. It occurs at arbitrary betatron frequency (the resonant detuning is always zero) and the magnitude of the parameter modulation of the betatron oscillation (strength of the resonance driving term) depends on the oscillation amplitude. Equilibrium between the radiation damping and the resonant excitation gives the boundary of the stable motion. Starting from 6d equations of motion we derive and solve the relevant differential equation describing the resonance, and show good agreement between analytical results and numerical simulation.

Published
2019

23. Dynamic Aperture of the NICA Collider Optimized with a Genetic Algorithm

Author

N. Carmignani, S. M. Liuzzo, O. S. Kozlov, S. Glukhov, A. V. Bogomyagkov, K. Iu. Kariukina, Evgeny Levichev, Sergey Kostromin, and European Synchrotron Radiation Facility (ESRF)

Subjects
Nuclear and High Energy Physics, magnet: design, Field (physics), [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], 01 natural sciences, law.invention, Nuclear physics, law, NICA, 0103 physical sciences, Radiology, Nuclear Medicine and imaging, 010306 general physics, Collider, Nuclear Experiment, numerical calculations, magnet: multipole, Physics, Nuclotron, Radiation, 010308 nuclear & particles physics, Mathematics::Operator Algebras, beam: width, Atomic and Molecular Physics, and Optics, quadrupole lens, Dynamic aperture, Nonlinear system, Transverse plane, Quadrupole, Physics::Accelerator Physics, final focus, Multipole expansion
Abstract

International audience; NICA (Nuclotron-based Ion Collider fAcility) [1] is a heavy-ion collider for studying the properties of hot and dense baryonic matter to be constructed at JINR (Dubna). A major restricting factor on the NICA’s transverse dynamic aperture is the nonlinear fringe field of final-focus quadrupole lenses. We propose to enhance the NICA dynamic aperture with a set of multipole lenses whose characteristics and configuration are optimized using a genetic algorithm.

Published
2019

24. Reduction of the beam emittance in the charged-particle storage rings with the help of periodic magnetic wigglers

Author

K. Yu. Karyukina, E. B. Levichev, and A. V. Bogomyagkov

Subjects
Physics, Physics and Astronomy (miscellaneous), Field (physics), 010308 nuclear & particles physics, business.industry, Wiggler, 01 natural sciences, Charged particle, 030218 nuclear medicine & medical imaging, 03 medical and health sciences, 0302 clinical medicine, Optics, 0103 physical sciences, Physics::Accelerator Physics, Thermal emittance, Beam emittance, business, Excitation, Storage ring, Beam (structure)
Abstract

Periodic magnetic structures (wigglers) have been successfully used for a long time for controlling beam parameters in charged-particle storage rings for various purposes (including the reduction of emittance). In this work, we optimize the optical functions of the storage ring gap into which a wiggler is installed for a more effective reduction of the emittance. Optimal solutions are obtained for the first time for FODOtype and theoretical minimum emittance (TME) structures. An original method is proposed for suppressing the contribution of the wiggler fields to the radiation excitation of the phase volume of the beam by modulating the field period along the wiggler axis.

Published
2016

25. Synchrotron Radiation Research and Application at VEPP-4

Author

P.D. Vobly, Sergey Sinyatkin, Pavel Piminov, V. A. Kiselev, Oleg Meshkov, S.A. Nikitin, Evgeny Levichev, I. B. Nikolaev, G.N. Baranov, V. M. Borin, Victor Dorokhov, K.V. Zolotarev, A. N. Zhuravlev, Sergey Karnaev, S. I. Mishnev, A. V. Bogomyagkov, and Dmitry Berkaev

Subjects
Physics, Accelerator physics, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Wiggler, Synchrotron radiation, Particle accelerator, Physics and Astronomy(all), 01 natural sciences, law.invention, Nuclear physics, Beamline, law, 0103 physical sciences, Physics::Accelerator Physics, High Energy Physics::Experiment, 010306 general physics, Storage ring, Beam (structure)
Abstract

VEPP-4 is a multipurpose storage ring facility at Budker Institute of Nuclear Physics (Novosibirsk, Russia) with several research programs including high energy physics in colliding beam mode, nuclear physics, synchrotron radiation, accelerator physics study, etc. The paper discusses VEPP-4 activities relating to generation and application of synchrotron radiation not only for SR user community but for beam diagnostics in storage ring as well.

Published
2016

26. Теоретический анализ динамики ледопородного ограждения при переходе на пассивный режим замораживания

Author

Mikhail A. Semin, Lev Yu. Levin, and Aleksandr V. Bogomyagkov

Subjects
lcsh:TN1-997, задача стефана, система замораживания, замораживающая колонка, технологические параметры, ледопородное ограждение, искусственное замораживание пород, lcsh:Mining engineering. Metallurgy, математическое моделирование
Abstract

В работе проведена серия расчетов искусственного замораживания породного массива при проходке шахтных стволов для условий строящегося калийного рудника. Численное решение получено посредством метода конечных элементов с помощью программного комплекса ANSYS. Получены численные зависимости толщины ледопородного ограждения от времени в фазах активного и пассивного замораживания для двух слоев породного массива с различными теплофизическими свойствами. Внешняя и внутренняя границы ледопородного ограждения рассчитывались двумя способами: по температуре фактического замерзания поровой воды и по температуре –8 °С, при которой проводились лабораторные измерения прочности замораживаемых горных пород. Рассмотрен нормальный режим работы замораживающей станции, а также аварийный режим, заключающийся в выходе из строя одной из замораживающих колонок. Исследовалась зависимость уменьшения толщины ледопородного ограждения в фазе пассивного замораживания от длительности фазы активного замораживания. Определено, что в аварийном режиме работы системы замораживания толщина ледопородного ограждения по изотерме –8 °С может уменьшаться на величину более 1,5 м. При этом толщина ледопородного ограждения по изотерме фактического замерзания воды практически всегда сохраняет положительную динамику. Показано, что при анализе толщины ледопородного ограждения по изотерме фактического замерзания поровой воды не представляется возможным оценить опасность аварийных ситуаций, связанных с выходом из строя замораживающих колонок.

Published
2020

27. 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

28. Design of beam optics for the future circular collider e+e− collider rings

Author

M. Benedikt, Frank Zimmermann, Sergey Sinyatkin, Pavel Piminov, L. Medina, MJ Sullivan, Ivan Koop, Sandra Aumon, Manuela Boscolo, A. V. Bogomyagkov, Bernhard Holzer, Kazuhito Ohmi, Eugene Levichev, Jorg Wenninger, Michael Koratzinos, B. Haerer, Yannis Papaphilippou, Helmut Burkhardt, Masamitsu Aiba, Katsunobu Oide, A. Doblhammer, Demin Zhou, Yunhai Cai, J. M. Jowett, Dmitry Shatilov, Alain Blondel, and U. Wienands

Subjects
Physics, Nuclear and High Energy Physics, Photon, Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, business.industry, Synchrotron radiation, Surfaces and Interfaces, 01 natural sciences, Future Circular Collider, law.invention, Dynamic aperture, Momentum, Optics, Beamline, law, 0103 physical sciences, Physics::Accelerator Physics, 010306 general physics, Collider, business, Beam (structure)
Abstract

A beam optics scheme has been designed for the Future Circular Collider-e+e- (FCC-ee). The main characteristics of the design are: beam energy 45 to 175 GeV, 100 km circumference with two interaction points (IPs) per ring, horizontal crossing angle of 30 mrad at the IP and the crab-waist scheme [1] with local chromaticity correction. The crab-waist scheme is implemented within the local chromaticity correction system without additional sextupoles, by reducing the strength of one of the two sextupoles for vertical chromatic correction at each side of the IP. So-called "tapering" of the magnets is applied, which scales all fields of the magnets according to the local beam energy to compensate for the effect of synchrotron radiation (SR) loss along the ring. An asymmetric layout near the interaction region reduces the critical energy of SR photons on the incoming side of the IP to values below 100 keV, while matching the geometry to the beam line of the FCC proton collider (FCC-hh) [2] as closely as possible. Sufficient transverse/longitudinal dynamic aperture (DA) has been obtained, including major dynamical effects, to assure an adequate beam lifetime in the presence of beamstrahlung and top-up injection. In particular, a momentum acceptance larger than +/-2% has been obtained, which is better than the momentum acceptance of typical collider rings by about a factor of 2. The effects of the detector solenoids including their compensation elements are taken into account as well as synchrotron radiation in all magnets. The optics presented in this paper is a step toward a full conceptual design for the collider. A number of issues have been identified for further study.

Published
2016

29. 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

30. 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

31. 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

32. Experiments on the physics of charged particle beams at the VEPP-4M electron-positron collider

Author

P. A. Piminov, Victor Smaluk, S.A. Nikitin, Yu. A. Tikhonov, D. A. Shvedov, G. V. Karpov, D. N. Shatilov, V. E. Blinov, S. I. Mishnev, V. A. Kiselev, E. I. Shubin, I. B. Nikolaev, N. Yu. Muchnoi, G. M. Tumaikin, O. V. Anchugov, V. V. Petrov, A. G. Shamov, S. E. Karnaev, Oleg Meshkov, E. A. Simonov, G. Ya. Kurkin, S. V. Sinyatkin, A. N. Zhuravlev, A. V. Bogomyagkov, E. B. Levichev, and A. N. Skrinsky

Subjects
Physics, General Physics and Astronomy, Particle accelerator, Electron, Betatron, law.invention, Nuclear physics, Positron, law, Physics::Accelerator Physics, High Energy Physics::Experiment, Collider, Particle beam, Charged particle beam, Storage ring
Abstract

The VEPP-4M accelerator facility with a universal KEDR detector is designed to conduct experiments with colliding electron-positron beams. High-energy physics, nuclear physics, and studies using synchrotron radiation are the main directions of research with this facility. In addition, experiments on poorly explored issues in the physics of beams in the electron-positron storage ring and methodological studies to prepare an experiment aimed at testing corollaries of the CPT theorem for an electron and a positron are regularly conducted at the VEPP-4 facility. A number of works performed in recent years are described: studies to increase the accuracy of comparing the electron and positron spin precession frequencies by the resonant depolarization method; measurements of the count rate of Touschek electrons as a function of the beam energy in a wide range; comparison of the methods for measuring the beam energy spread; a study of the electron beam dynamics when a nonlinear betatron resonance is crossed.

Published
2009

33. Energy determination at BEPC-II

Author

E. E. Pyata, V. E. Blinov, N. Yu. Muchnoi, A. V. Bogomyagkov, Huamin Qu, G. S. Varner, S.A. Nikitin, I. B. Nikolaev, F. A. Harris, V.V. Kaminsky, Xiao-Hu Mo, Yifang Wang, C.D. Fu, Qing Qin, C. P. Shen, V.N. Zhilich, S.L. Olsen, M. N. Achasov, Qian Liu, Jinqiang Xu, and A.G. Shamov

Subjects
Physics, Nuclear and High Energy Physics, Astrophysics::High Energy Astrophysical Phenomena, Positron beam, Electron, Compton backscattering, Atomic and Molecular Physics, and Optics, law.invention, Nuclear physics, law, Calibration, Physics::Accelerator Physics, High Energy Physics::Experiment, Collider, Beam energy, Energy (signal processing)
Abstract

The BEPC-II collider beam energy calibration system is discussed. The system is based on the Compton backscattering method. The expected precision of the electron and positron beam energy e determination is δ e / e ≈ 3 ⋅ 10 − 5 .

Published
2009

34. Review of beam energy measurements at VEPP-4M collider

Author

N. Yu. Muchnoi, V. N. Zhilich, A.G. Shamov, A. V. Bogomyagkov, I. B. Nikolaev, S.A. Nikitin, and V. E. Blinov

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Photon, Physics::Instrumentation and Detectors, Detector, Compton scattering, law.invention, Nuclear physics, law, Physics::Accelerator Physics, High Energy Physics::Experiment, Atomic physics, Collider, Instrumentation, Beam (structure), Energy (signal processing), Lepton
Abstract

An accurate knowledge of the colliding beam energies is essential for the current experiments with the KEDR detector at the VEPP-4M collider. Now the experimental activity is focused on the measurements of τ lepton mass and parameters of narrow resonances of the ψ -family in the c.m.energy range of 3.0–4.0 GeV. Two complementary approaches are used for the beam energy measurements. The resonant spin depolarization technique (RD) provides an accuracy about 1–3 keV for the instantaneous beam energy value, but requires a special regime of the collider. Between calibrations the interpolation procedure is used providing the accuracy of 6–10 keV for the J / ψ , ψ ( 2 s ) and 15–30 keV for the τ lepton mass determination experiments. Another approach allows to calculate beam energy via the maximum energy of backscattering laser photons. The Compton BackScattering (CBS) monitor allows continuous on-line monitoring of the beam energy with accuracy about 150 keV, which is critical during the τ lepton mass measurement. The statistical error for a 1 h period is about 100 keV, the present systematic error is 50–70 keV.

Published
2009

35. Measurement of the τ lepton mass at the KEDR detector

Author

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

Subjects
Nuclear physics, Physics, Particle physics, Physics and Astronomy (miscellaneous), law, Detector, Collider, Mass measurement, Lepton, law.invention
Abstract

A precise τ lepton mass measurement performed 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 result based on 6.7 pb−1 of data is m τ = 1776.81 −0.23 +0.25 ± 0.15 MeV. Using 0.8 pb−1 of data collected at the ψ′ peak, we have also determined that Γ ee B ττ(ψ′) = 9.0 ± 2.6 eV.

Published
2007

36. 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

37. Analysis of errors and estimation of accuracy in the experiment on precise mass measurement of J/ψ, ψ′ mesons and τ-lepton on the VEPP-4M collider

Author

S.A. Nikitin, G.M. Tumaikin, A. V. Bogomyagkov, I. Ya. Protopopov, V. A. Kiselev, K. Yu Todyshev, and V. E. Blinov

Subjects
Larmor precession, Physics, Nuclear and High Energy Physics, Particle physics, Meson, Mass measurement, law.invention, Nuclear physics, law, Calibration, Physics::Accelerator Physics, High Energy Physics::Experiment, Collider, Instrumentation, Lepton, Spin-½
Abstract

The goal of this work is an evaluation of utmost precision and analysis of any possible errors and corrections in planned experiment of new mass measurement of J/ψ and ψ′ mesons on VEPP-4M collider with absolute energy calibration by the spin precession frequency measurements.

Published
2002

38. [Untitled]

Author

D. S. Gurov, A. N. Skrinskii, Pavel Piminov, A. V. Bogomyagkov, Oleg Meshkov, V. V. Petrov, V. A. Kiselev, I. B. Nikolaev, Sergey Karnaev, E. V. Kremyanskaya, E. A. Simonov, S.A. Nikitin, Dmitry Shatilov, G.M. Tumaikin, S. I. Mishnev, Evgeny Levichev, A. I. Naumenkov, I. Ya. Protopopov, and Vladimir Blinov

Subjects
Physics, Nuclear physics, Nuclear Energy and Engineering, Detector, Physics::Accelerator Physics, High Energy Physics::Experiment, Depolarization, Atomic physics, Polarization (waves), Quantum fluctuation, Absolute calibration, Lepton
Abstract

An experiment, using the new detector Kedr, on the precise measurement of the τ-lepton mass is being readied on the VEPP-4M. The resonance depolarization method is used for absolute calibration of the particle energy. The main difficulty in using a polarized beam at the τ-lepton production threshold (1777 MeV) is the closeness of an integral spin resonance (1763 MeV). Experiments observing the polarization of particles in VEPP-4M after injection of the polarized beam from the VEPP-3 storage booster with different detunings from resonance have been performed. For comparison, the depolarization time of a beam due to quantum fluctuations in the presence of characteristic disturbances of the guiding field is calculated. The temporal stability of the energy indications is studied.

Published
2002

39. Beam-beam effects investigation and parameters optimization for a circulare+e−collider at very high energies

Author

Evgeny Levichev, Dmitry Shatilov, and A. V. Bogomyagkov

Subjects
Electromagnetic field, Physics, Nuclear and High Energy Physics, Luminosity (scattering theory), Large Hadron Collider, Physics and Astronomy (miscellaneous), High Energy Physics::Phenomenology, Electroweak interaction, Synchrotron radiation, Surfaces and Interfaces, law.invention, Nuclear physics, law, Higgs boson, Physics::Accelerator Physics, High Energy Physics::Experiment, Collider, Beam (structure)
Abstract

Several proposals exist for future circular electron-positron colliders designed for precise measurements of the Higgs boson characteristics and electroweak processes. At very high energies, synchrotron radiation of the particles in a strong electromagnetic field of the oncoming bunch (beamstrahlung) becomes extremely important, because of degradation of the beam lifetime and luminosity. We present theoretical calculations of beamstrahlung (including the beam lifetime reduction and the energy spread increase) which are benchmarked against quasi-strong-strong computer simulations. Calculation results are used to optimize TLEP (triple LEP) project (CERN).

Published
2014

40. 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

41. Longitudinally polarized electrons in Novosibirsk c-tau factory

Author

A V Otboev, I A Koop, and A V Bogomyagkov

Subjects
Physics, History, Cathode ray, Physics::Accelerator Physics, Synchrotron radiation, Electron, Atomic physics, Polarization (waves), Storage ring, Quantum fluctuation, Computer Science Applications, Education
Abstract

We consider a scenario for achieving and preserving the longitudinal polarization of the electron beam in the Novosibirsk tau-charm factory. The storage ring for electrons will be equipped with 5 spin rotators ? the so-called Siberian Snakes. These Snakes strongly reduce the spin-orbit coupling and, thus, suppress the depolarization of the electron beam caused by quantum fluctuations of the synchrotron radiation. The proposed scheme provides a high polarization degree up to 80% ? 90% in the full energy range.

Published
2011

42. New fast beam profile monitor for electron-positron colliders

Author

N. Yu. Muchnoi, A. N. Selivanov, V. A. Kiselev, Oleg Meshkov, A. V. Bogomyagkov, A. N. Zhuravlev, Aleksandr Khilchenko, V. F. Gurko, Victor Smaluk, and P. V. Zubarev

Subjects
Physics, Photomultiplier, Physics::Instrumentation and Detectors, business.industry, Dynamic range, Particle accelerator, Electron, STRIPS, law.invention, Nuclear physics, Optics, law, Measuring instrument, Physics::Accelerator Physics, business, Collider, Instrumentation, Beam (structure)
Abstract

A new fast beam profile monitor has been developed at the Budker Institute of Nuclear Physics. This monitor is based on the Hamamatsu multianode photomultiplier with 16 anode strips and provides turn-by-turn measurement of the transverse beam profile. The device is equipped with an internal memory, which has enough capacity to store 131,072 samples of the beam profile. The dynamic range of the beam profile monitor allows us to study turn-by-turn beam dynamics within the bunch charge range from 1 pC up to 10 nC. Using this instrument, we have investigated at the VEPP-4M electron-positron collider a number of beam dynamics effects which cannot be observed by other beam diagnostics tools.

Published
2007

43. IMPROVEMENT OF THE MATHEMATICAL MODEL OF HEAT AND MASS TRANSFER IN FROZEN SOILS IMPLEMENTED IN THE FROZENWALL PROGRAM

Author

Alexander V. Bogomyagkov and Aleksey V. Pugin

Subjects
artificial ground freezing, frozen wall, mine shaft, potash mine, mathematical modeling, software, Engineering geology. Rock mechanics. Soil mechanics. Underground construction, TA703-712
Abstract

The relevance of formulation and numerical implementation of heat and mass transfer model in frozen soils considering mine shaft construction is caused by a number of technological factors and features of artificial ground freezing procedure. Correct calculation of artificial ground freezing for specific practical cases is impossible without taking into account such factors as variable mode of operation of the freeze pipes, presence of two freezing contours, different lengths of the supply pipes of the freeze pipes, heat exchange with the space of the mine shaft of variable depth, formation of cavities in the volume of frozen soils due to soil fallout, heat generation from hardening cement mortar, pore water filtration. These factors are taken into account in the heat and mass transfer model implemented in the specialized program FrozenWall, designed for thermotechnical calculation of artificial ground freezing and developed with the participation of the authors of the paper. The main aim of this work is to describe the improvements made to the algorithms of the FrozenWall software in the course of monitoring the state of the frozen wall on the vertical shafts of potash mines under construction. The objects of study are frozen soils around the potash mine shafts under construction. Methods included experimental temperature measurement in thermal control boreholes, data processing, mathematical modeling of artificial freezing of soils, parameterization of the heat transfer model in soils according to field observations by solving the inverse Stefan problem. Results. In the course of the modernization in the FrozenWall program, the algorithms were added that take into account such technological factors as unstable operation of freeze pipes, presence of two freezing contours, different lengths of the supply pipes inside the freeze pipes, heat exchange with the shaft space, formation of cavities in the volume of frozen soils due to rock outbursts, heat release from hardening cement mortar in the shaft under construction, filtration of pore water. Taking into account these factors, it becomes possible to develop new technical measures aimed at ensuring the efficiency of the construction of mine shafts in difficult hydrogeological conditions and possible emergency situations.

Published
2023
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44. Measurement of Γee(J/ψ) with KEDR detector

Author

V. V Anashin, V. M Aulchenko, E. M Baldin, A. K Barladyan, A. Y Barnyakov, M. Y Barnyakov, S. E Baru, I. V Bedny, 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, Y. 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. Y Kotov, E. A Kravchenko, V. F Kulikov, G. Y 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. Y 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, 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, Y. 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, Y. A Tikhonov, K. Y Todyshev, G. M Tumaikin, Y. V Usov, A. I Vorobiov, A. N Yushkov, V. N Zhilich, V. V Zhulanov, and A. N Zhuravlev

Subjects
e+-e- Experiments, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

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 ΓeeJ/ψ=5.550±0.056±0.089keV,ΓeeJ/ψ·ℬhadronsJ/ψ=4.884±0.048±0.078keV,ΓeeJ/ψ·ℬeeJ/ψ=0.3331±0.0066±0.0040keV. $$ \begin{array}{c}\hfill {\Gamma}_{ee}\left(J/\psi \right)=5.550\pm 0.056\pm 0.089\kern0.5em \mathrm{keV},\hfill \\ {}\hfill {\Gamma}_{ee}\left(J/\psi \right)\cdotp {\mathrm{\mathcal{B}}}_{\mathrm{hadrons}}\left(J/\psi \right)=4.884\pm 0.048\pm 0.078\kern0.5em \mathrm{keV},\hfill \\ {}\hfill {\Gamma}_{ee}\left(J/\psi \right)\cdotp {\mathrm{\mathcal{B}}}_{ee}\left(J/\psi \right)=0.3331\pm 0.0066\pm 0.0040\kern0.5em \mathrm{keV}.\hfill \end{array} $$ 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: Γ=92.94±1.83keV. $$ \Gamma =92.94\pm 1.83\kern0.5em \mathrm{keV}. $$ These results are consistent with the previous experiments.

Published
2018
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