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13 results on '"E.A. Kozyrev"'

1. Recent results from the CMD-3 detector

Author

Yu. M. Shatunov, Alexey Talyshev, V.E. Shebalin, V. L. Ivanov, F.V. Ignatov, A. N. Kirpotin, E.A. Kozyrev, A.E. Bondar, A.N. Kozyrev, Sergei V. Karpov, V.Sh. Banzarov, N.M. Ryskulov, P. Yu. Shatunov, A.S. Kuzmin, Yu. A. Rogovsky, D.E. Berkaev, P. Krokovny, A. V. Semenov, S.I. Eidelman, A. V. Otboev, A.S. Popov, Alexey Anisenkov, P.A. Lukin, G.V. Fedotovich, K.Yu. Mikhailov, I. A. Koop, A. I. Senchenko, S.E. Gayazov, D.N. Shemyakin, V.M. Aulchenko, A.A. Ruban, Yu.V. Yudin, D.N. Grigoriev, D. B. Shwartz, I.B. Logashenko, A.L. Sibidanov, L.B. Epshtein, G.P. Razuvaev, N.S. Bashtovoy, A. I. Vorobiov, V.M. Titov, B.A. Shwartz, A.E. Ryzhenenkov, R.R. Akhmetshin, A.N. Amirkhanov, Yu.N. Pestov, A.V. Bragin, A.E. Kuzmenko, A.A. Grebenuk, D.A. Epifanov, Ilya Zemlyansky, S.S. Gribanov, A.L. Erofeev, E. P. Solodov, A.A. Korobov, Vassili Kazanin, and V.S. Okhapkin

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), 010308 nuclear & particles physics, Hadron, Detector, 01 natural sciences, law.invention, law, 0103 physical sciences, 010306 general physics, Collider, Energy (signal processing)
Abstract

This paper reports a current status of the measurements of the hadronic cross sections in the c.m. energy range from 0.32 to 2.0 GeV with the CMD-3 detector at the VEPP-2000 electron-positron collider. The overall size of the data, acquired by the CMD-3 in the runs of 2010–2013 and 2017–2018 years, is about 160 pb−1. The results of data analysis for various exclusive modes of e + e − → h a d r o n s are described.

Published
2020

2. Study of the process e+e−→KS0K±π∓π+π− in the c.m. energy range 1.6–2.0 GeV with the CMD-3 detector

Author

R.R. Akhmetshin, A.N. Amirkhanov, A.V. Anisenkov, V.M. Aulchenko, N.S. Bashtovoy, D.E. Berkaev, A.E. Bondar, A.V. Bragin, S.I. Eidelman, D.A. Epifanov, L.B. Epshteyn, A.L. Erofeev, G.V. Fedotovich, A.O. Gorkovenko, F.J. Grancagnolo, A.A. Grebenuk, S.S. Gribanov, D.N. Grigoriev, F.V. Ignatov, V.L. Ivanov, S.V. Karpov, V.F. Kazanin, A.N. Kirpotin, I.A. Koop, A.A. Korobov, A.N. Kozyrev, E.A. Kozyrev, P.P. Krokovny, A.S. Kuzmin, I.B. Logashenko, P.A. Lukin, K.Yu. Mikhailov, I.V. Obraztsov, V.S. Okhapkin, A.V. Otboev, Yu.N. Pestov, A.S. Popov, G.P. Razuvaev, Yu.A. Rogovsky, A.A. Ruban, N.M. Ryskulov, A.E. Ryzhenenkov, A.V. Semenov, A.I. Senchenko, P.Yu. Shatunov, Yu.M. Shatunov, V.E. Shebalin, D.N. Shemyakin, B.A. Shwartz, D.B. Shwartz, A.L. Sibidanov, E.P. Solodov, V.M. Titov, A.A. Talyshev, S.S. Tolmachev, A.I. Vorobiov, I.M. Zemlyansky, D.S. Zhadan, A.S. Zubakin, and Yu.V. Yudin

Subjects
Nuclear and High Energy Physics
Published
2023

3. Observation of a fine structure in e+e− → hadrons production at the nucleon-antinucleon threshold

Author

Yu. M. Shatunov, N.M. Ryskulov, V.S. Okhapkin, D. B. Shwartz, A. N. Kirpotin, A. I. Senchenko, D.N. Shemyakin, A.L. Sibidanov, D.N. Grigoriev, P. Yu. Shatunov, F.V. Ignatov, V.E. Shebalin, A.I. Vorobiov, V. L. Ivanov, Yu.N. Pestov, Yu.V. Yudin, P.A. Lukin, A.V. Bragin, E. P. Solodov, N.S. Bashtovoy, A.A. Korobov, B.A. Shwartz, A.S. Popov, G.P. Razuvaev, G.V. Fedotovich, D.E. Berkaev, A.E. Ryzhenenkov, Alexey Talyshev, Vassili Kazanin, R.R. Akhmetshin, S.V. Karpov, E.A. Kozyrev, S.E. Gayazov, A.S. Kuzmin, V.Sh. Banzarov, D.A. Epifanov, K.Yu. Mikhailov, I. A. Koop, A.N. Amirkhanov, A.E. Bondar, A.A. Ruban, V.M. Titov, I.B. Logashenko, V.M. Aulchenko, A.E. Kuzmenko, L.B. Epshteyn, A.N. Kozyrev, S.I. Eidelman, A. V. Otboev, A.A. Grebenuk, S. S. Tolmachev, Ilya Zemlyansky, S.S. Gribanov, A.L. Erofeev, Alexey Anisenkov, and P. Krokovny

Subjects
Physics, Nuclear and High Energy Physics, Resonance amplitude, Annihilation, Electron–positron annihilation, Hadron, High Energy Physics::Experiment, Atomic physics, Nucleon, Nuclear Experiment, lcsh:Physics, lcsh:QC1-999, High Energy Physics - Experiment
Abstract

A study of hadron production at the nucleon-antinucleon threshold has been performed with the CMD-3 detector at the VEPP-2000 $e^+e^-$ collider. A very fast rise with about 1 MeV width has been observed in the $e^+e^- \to p\bar p$ cross section. A sharp drop in the $e^+e^- \to 3(\pi^+\pi^-)$ cross section has been confirmed and found to have a less than 2 MeV width, in agreement with the observed fast rise of the $e^+e^- \to p\bar p$ cross section. For the first time a similar sharp drop is demonstrated in the $e^+e^- \to K^+K^-\pi^+\pi^-$ cross section. The behavior of the $e^+e^- \to 3(\pi^+\pi^-),~ K^+K^-\pi^+\pi^-$ cross sections cannot be explained by an interference of any resonance amplitude with continuum, therefore this phenomenon cannot be due to a narrow near-threshold resonance. No such structure has been observed in the $e^+e^- \to 2(\pi^+\pi^-)$ cross section., Comment: 7 pages, 5 figures

Published
2019

4. Study of the process e+e− → 3(π+π−)π0 in the c.m. energy range 1.6–2.0 GeV with the CMD-3 detector

Author

R.R. Akhmetshin, A.N. Amirkhanov, A.V. Anisenkov, V.M. Aulchenko, V.Sh. Banzarov, N.S. Bashtovoy, D.E. Berkaev, A.E. Bondar, A.V. Bragin, S.I. Eidelman, D.A. Epifanov, L.B. Epshteyn, A.L. Erofeev, G.V. Fedotovich, S.E. Gayazov, A.A. Grebenuk, S.S. Gribanov, D.N. Grigoriev, F.V. Ignatov, V.L. Ivanov, S.V. Karpov, V.F. Kazanin, I.A. Koop, A.N. Kirpotin, A.A. Korobov, A.N. Kozyrev, E.A. Kozyrev, P.P. Krokovny, A.E. Kuzmenko, A.S. Kuzmin, I.B. Logashenko, P.A. Lukin, K.Yu. Mikhailov, V.S. Okhapkin, A.V. Otboev, Yu.N. Pestov, A.S. Popov, G.P. Razuvaev, Yu.A. Rogovsky, A.A. Ruban, N.M. Ryskulov, A.E. Ryzhenenkov, A.I. Senchenko, Yu.M. Shatunov, P.Yu. Shatunov, V.E. Shebalin, D.N. Shemyakin, B.A. Shwartz, D.B. Shwartz, A.L. Sibidanov, E.P. Solodov, V.M. Titov, A.A. Talyshev, A.I. Vorobiov, I.M. Zemlyansky, and Yu.V. Yudin

Subjects
Nuclear and High Energy Physics, lcsh:Physics, lcsh:QC1-999, High Energy Physics - Experiment
Abstract

The cross section of the process $e^+e^- \to 3(\pi^+\pi^-)\pi^0$ has been measured for the first time using a data sample of 56.7 pb$^{-1}$ collected with the CMD-3 detector at the VEPP-2000 $e^+e^-$ collider. 632$\pm$32 signal events have been selected in the center-of-mass energy range 1.6 -- 2.0 GeV. A study of dynamics of seven-pion production allows one to extract contributions of the dominated $2(\pi^+\pi^-)\omega$ and $2(\pi^+\pi^-)\eta$ intermediate states., Comment: 13 pages, 5 figures

Published
2019

5. Hadronic cross sections with the CMD-3 detector at the VEPP-2000

Author

A. N. Kirpotin, A. I. Senchenko, I.B. Logashenko, D.N. Shemyakin, L.B. Epshteyn, S.E. Gayazov, A.A. Ruban, A.E. Kuzmenko, I. A. Koop, D. B. Shwartz, A.L. Sibidanov, G.P. Razuvaev, S.S. Gribanov, P.A. Lukin, A.L. Erofeev, P. Krokovny, Yu.V. Yudin, Yu.N. Pestov, Alexey Talyshev, A.N. Amirkhanov, V.Sh. Banzarov, D. Epifanov, F.V. Ignatov, N.M. Ryskulov, D.E. Berkaev, Yu. A. Rogovsky, E.A. Kozyrev, Ilya Zemlyansky, Alexey Anisenkov, B.A. Shwartz, A.E. Ryzhenenkov, V.M. Titov, R.R. Akhmetshin, N.S. Bashtovoy, V.S. Okhapkin, A.A. Grebenuk, A.V. Bragin, A.S. Kuzmin, A.E. Bondar, S.V. Karpov, P. Yu. Shatunov, E. P. Solodov, A.A. Korobov, V.M. Aulchenko, A.N. Kozyrev, V.E. Shebalin, A.I. Vorobiov, V. L. Ivanov, G.V. Fedotovich, Vassili Kazanin, Yu. M. Shatunov, Semen Eidelman, A.S. Popov, K.Yu. Mikhailov, A. V. Otboev, and D.N. Grigoriev

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Luminosity (scattering theory), 010308 nuclear & particles physics, Electron–positron annihilation, Hadron, Detector, 01 natural sciences, law.invention, law, 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics, Collider, VEPP-2000
Abstract

This paper reports measurements of the hadronic cross sections with the CMD-3 detector at the VEPP-2000 electron-positron collider. The overall size of the data sample analyzed is about 60 pb-1, collected by the CMD- 3 running since December 2010 up to June 2013 in the c.m. energy range from 0.32 to 2.0 GeV. The preliminary results of data analysis for various modes of e + e − → hadrons are discussed.

Published
2018

6. Charged particle identification with the liquid xenon calorimeter of the CMD-3 detector

Author

S. Eidelman, E. P. Solodov, A. A. Grebenuk, A.N. Kozyrev, Yu.N. Pestov, L.B. Epshteyn, D.N. Grigoriev, A.A. Korobov, A.E. Kuzmenko, Yu.V. Yudin, Alexey Anisenkov, V. L. Ivanov, N.M. Ryskulov, A.L. Erofeev, P.A. Lukin, Vassili Kazanin, A.N. Amirkhanov, D.N. Shemyakin, D.A. Epifanov, G.P. Razuvaev, V. M. Aulchenko, S.S. Tolmachev, Alexei Talyshev, P. Krokovny, S.E. Gayazov, S.S. Gribanov, A.S. Popov, A.V. Semenov, A. A. Uskov, E.A. Kozyrev, V.S. Okhapkin, A.S. Kuzmin, K.Yu. Mikhailov, F.V. Ignatov, Sergei V. Karpov, A.E. Bondar, A.V. Bragin, I.B. Logashenko, A. I. Vorobiov, A.E. Ryzhenenkov, B. Shwartz, V.E. Shebalin, A.A. Ruban, G.V. Fedotovich, V.M. Titov, N.S. Bashtovoy, and R.R. Akhmetshin

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Muon, Calorimeter (particle physics), Physics::Instrumentation and Detectors, chemistry.chemical_element, Particle identification, Charged particle, law.invention, Nuclear physics, Xenon, Pion, chemistry, law, High Energy Physics::Experiment, Collider, Instrumentation
Abstract

The paper describes a method of the charged particle identification, developed for the CMD-3 detector, installed at the VEPP-2000 e + e − collider. The method is based on application of boosted decision trees classifiers, trained for the optimal separation of electrons, muons , pions and kaons in the momentum range from 100 to 1200 MeV / c . The input variables for the classifiers are linear combinations of the energy depositions of charged particles in 12 layers of the liquid xenon calorimeter of the CMD-3. The event samples for training of the classifiers are taken from the simulation. Various issues of the calorimeter strip channels response simulation and their calibration are considered. Application of the method is illustrated by the examples of separation of the e + e − ( γ ) and π + π − ( γ ) final states and of selection of the K + K − final state at high energies.

Published
2021

7. Study of the process e + e − → π + π − π 0 η in the c.m. energy range 1394–2005 MeV with the CMD-3 detector

Author

L.B. Epshteyn, A.E. Bondar, S. Eidelman, A.N. Kozyrev, Yu. A. Rogovsky, I.B. Logashenko, A.A. Ruban, G.P. Razuvaev, A. V. Otboev, Alexey Anisenkov, A.S. Kuzmin, A.S. Popov, Alexei Talyshev, A.L. Erofeev, D.N. Grigoriev, V. L. Ivanov, A. N. Kirpotin, R.R. Akhmetshin, B. Shwartz, E.A. Kozyrev, D.A. Epifanov, K.Yu. Mikhailov, F.V. Ignatov, Yu. M. Shatunov, A.E. Ryzhenenkov, V.S. Okhapkin, P. Krokovny, Ivan Koop, D. E. Berkaev, A.A. Korobov, V. M. Aulchenko, A.V. Bragin, Vassili Kazanin, N.S. Bashtovoy, D. B. Shwartz, V.M. Titov, V.E. Shebalin, P. Yu. Shatunov, A. I. Vorobiov, G.V. Fedotovich, P.A. Lukin, Yu.V. Yudin, A. I. Senchenko, S.E. Gayazov, S.S. Gribanov, D.N. Shemyakin, V.Sh. Banzarov, A.N. Amirkhanov, A.L. Sibidanov, N.M. Ryskulov, Sergei V. Karpov, E. P. Solodov, A. A. Grebenuk, Yu.N. Pestov, A.E. Kuzmenko, and Ilya Zemlyansky

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), 010308 nuclear & particles physics, Electron–positron annihilation, Detector, Analytical chemistry, 01 natural sciences, lcsh:QC1-999, Lower energy, High Energy Physics - Experiment, law.invention, law, 0103 physical sciences, Pi, Intermediate state, High Energy Physics::Experiment, 010306 general physics, Collider, lcsh:Physics, Energy (signal processing)
Abstract

The cross section of the process $e^+e^- \to \pi^+\pi^-\pi^0\eta$ has been measured using a data sample of 21.8 pb$^{-1}$ collected with the CMD-3 detector at the VEPP-2000 $e^+e^-$ collider. 2769$\pm$95 signal events have been selected in the center-of-mass energy range 1394--2005 MeV. The production dynamics is dominated by the $\omega(782)\eta$ and $\phi(1020)\eta$ intermediate states in the lower energy range, and by the $a_0(980)\rho(770)$ intermediate state at higher energies., Comment: 20 pages, 11 figures, 2 tables

Published
2017

8. Study of the processe+e−→KS0KL0in the center-of-mass energy range 1004–1060 MeV with the CMD-3 detector at the VEPP-2000 e + e − collider

Author

Yu. M. Shatunov, Alexey Anisenkov, N.M. Ryskulov, E. P. Solodov, A.V. Bragin, A.A. Korobov, Yu.N. Pestov, P.A. Lukin, Fedor Ignatov, N.S. Bashtovoy, Vassili Kazanin, A.L. Erofeev, V.M. Titov, A.S. Kasaev, A.N. Kozyrev, A.S. Popov, D.E. Berkaev, S.S. Gribanov, A.N. Amirkhanov, V.M. Aulchenko, B.A. Shwartz, K.Yu. Mikhailov, A.E. Bondar, V.S. Okhapkin, A.E. Ryzhenenkov, S.V. Karpov, A. N. Kirpotin, L.B. Epshteyn, D. Epifanov, Yu.V. Yudin, A. I. Senchenko, I. A. Koop, A.A. Grebenuk, D.N. Shemyakin, I.B. Logashenko, P. Yu. Shatunov, S.I. Eidelman, A. V. Otboev, D.N. Grigoriev, G.V. Fedotovich, V. S. Banzarov, A.L. Sibidanov, G.P. Razuvaev, S.E. Gayazov, Alexey Talyshev, A.A. Ruban, A.S. Kuzmin, A.E. Kuzmenko, E.A. Kozyrev, P. Krokovny, V.E. Shebalin, A.I. Vorobiov, V. L. Ivanov, D.B. Shwartz, and O.A. Kovalenko

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Particle physics, 010308 nuclear & particles physics, Detector, 01 natural sciences, law.invention, Nuclear physics, law, 0103 physical sciences, Center of mass, 010306 general physics, Collider, VEPP-2000, Energy (signal processing)
Abstract

This work is supported in part by the Russian Education and by the Russian Foundation for Basic RFBR 14-02-00580-a, RFBR 14-02-91332, RFBR 15-02-05674-a and RFBR 16-02-00160-a.

Published
2016

9. Study of the process e+e−→pp¯ in the c.m. energy range from threshold to 2 GeV with the CMD-3 detector

Author

Fedor Ignatov, A.V. Bragin, D. Epifanov, Yu.V. Yudin, G.P. Razuvaev, A.L. Sibidanov, S.G. Pivovarov, B.I. Khazin, S.I. Eidelman, A. V. Otboev, N.M. Ryskulov, B.A. Shwartz, A.E. Ryzhenenkov, R.R. Akhmetshin, S.S. Gribanov, D.E. Berkaev, A.L. Erofeev, I.B. Logashenko, S.E. Gayazov, P. Krokovny, A.E. Bondar, A.A. Grebenuk, Yu.N. Pestov, A.E. Kuzmenko, O.A. Kovalenko, S.V. Karpov, I. A. Koop, Alexey Talyshev, D. B. Shwartz, E.A. Kozyrev, Yu. M. Shatunov, Alexey Anisenkov, V.S. Okhapkin, V.M. Aulchenko, A.S. Kasaev, A.N. Kozyrev, A.L. Romanov, L.B. Epshteyn, D.N. Grigoriev, A.N. Amirkhanov, A. N. Kirpotin, D.N. Shemyakin, A.A. Ruban, V.Sh. Banzarov, A.S. Popov, K.Yu. Mikhailov, V.M. Titov, Yu. M. Zharinov, P. Yu. Shatunov, G.V. Fedotovich, E.M. Gromov, E. P. Solodov, Vassili Kazanin, A.S. Kuzmin, V.E. Shebalin, A.I. Vorobiov, V. L. Ivanov, P.A. Lukin, and N.S. Bashtovoy

Subjects
Physics, Systematic error, Nuclear and High Energy Physics, Range (particle radiation), 010308 nuclear & particles physics, Electron–positron annihilation, Detector, 01 natural sciences, law.invention, Nuclear physics, Angular distribution, law, 0103 physical sciences, 010306 general physics, Nucleon, Collider, Energy (signal processing)
Abstract

Using a data sample of 7.7 pb − 1 collected with the CMD-3 detector at the VEPP-2000 e + e − collider we select about 2900 events of the process e + e − → p p ¯ and measure its cross section at 12 energy points with about 6% systematic uncertainty. From the angular distribution of produced nucleons we obtain the ratio G E / G M .

Published
2016

10. Performance and Characterization of CsI:Tl thin Films for X-ray Imaging Application

Author

E.A. Kozyrev, K. E. Kuper, A.V. Petrozhitskiy, A. G. Lemzyakov, and A.S. Popov

Subjects
Photon, Yield (engineering), Materials science, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, business.industry, Resolution (electron density), X-ray, Physics and Astronomy(all), Scintillator, 01 natural sciences, Characterization (materials science), 010309 optics, Optics, 0103 physical sciences, Thin film, business, Image resolution
Abstract

High spatial resolution thin CsI:Tl scintillator films was prepared by thermal deposition method for X-ray imaging applications. We fabricated CsI:Tl scintillators ranging from 2 μm to 14 μm in thickness. We measured spacial resolution and light yield as a function of input photons energy (5-40 keV) and film thickness. To improve spatial resolution of films carbon post-deposition treatments was performed.

Published
2016

11. Study of the process e+e−→KS0KS0π+π− in the c.m. energy range 1.6–2.0 GeV with the CMD-3 detector

Author

R.R. Akhmetshin, A.N. Amirkhanov, A.V. Anisenkov, V.M. Aulchenko, V.Sh. Banzarov, N.S. Bashtovoy, D.E. Berkaev, A.E. Bondar, A.V. Bragin, S.I. Eidelman, D.A. Epifanov, L.B. Epshteyn, A.L. Erofeev, G.V. Fedotovich, S.E. Gayazov, F.J. Grancagnolo, A.A. Grebenuk, S.S. Gribanov, D.N. Grigoriev, F.V. Ignatov, V.L. Ivanov, S.V. Karpov, A.S. Kasaev, V.F. Kazanin, I.A. Koop, A.A. Korobov, A.N. Kozyrev, E.A. Kozyrev, P.P. Krokovny, A.E. Kuzmenko, A.S. Kuzmin, I.B. Logashenko, P.A. Lukin, A.P. Lysenko, K.Yu. Mikhailov, V.S. Okhapkin, E.A. Perevedentsev, Yu.N. Pestov, A.S. Popov, G.P. Razuvaev, A.A. Ruban, N.M. Ryskulov, A.E. Ryzhenenkov, A.V. Semenov, Yu.M. Shatunov, V.E. Shebalin, D.N. Shemyakin, B.A. Shwartz, D.B. Shwartz, A.L. Sibidanov, E.P. Solodov, M.V. Timoshenko, V.M. Titov, A.A. Talyshev, A.I. Vorobiov, I.M. Zemlyansky, and Yu.V. Yudin

Subjects
Nuclear and High Energy Physics
Published
2020

12. Search for the processe+e−→η′(958)with the CMD-3 detector

Author

N.M. Ryskulov, N. Yu. Muchnoi, A.L. Erofeev, V.S. Okhapkin, B.A. Shwartz, D.N. Grigoriev, D.E. Berkaev, A.E. Ryzhenenkov, S.E. Gayazov, L.B. Epshteyn, R.R. Akhmetshin, E. P. Solodov, V.M. Titov, P. Yu. Shatunov, P. Krokovny, A.A. Ruban, A.V. Bragin, I.B. Logashenko, A.S. Kuzmin, G.V. Fedotovich, A.E. Kuzmenko, V.E. Shebalin, A.I. Vorobiov, S.I. Eidelman, O.A. Kovalenko, A.L. Sibidanov, Yu.V. Yudin, Yu.N. Pestov, I. A. Koop, B.I. Khazin, N.S. Bashtovoy, Yu. A. Rogovsky, E.A. Perevedentsev, F.V. Ignatov, G.P. Razuvaev, Alexey Anisenkov, Alexey Talyshev, E.A. Kozyrev, V.M. Aulchenko, A.N. Kozyrev, D. A. Epifanov, A.L. Romanov, A.E. Bondar, S.V. Karpov, E.N. Gromov, Yu. M. Shatunov, A.S. Popov, P.A. Lukin, K.Yu. Mikhailov, Vassili Kazanin, D.B. Shwartz, D.N. Shemyakin, V.Sh. Banzarov, and A.A. Grebenuk

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Electron–positron annihilation, Detector, Physical chemistry
Abstract

A search for the process e + e − → η ′ ( 958 ) in the π + π − η → π + π − γ γ final state has been performed with the CMD-3 detector at the VEPP-2000 e + e − collider. Using an integrated luminosity of 2.69 pb − 1 collected at the center-of-mass energy E c.m. = 957.68 MeV we set an upper limit for the product of electronic width and branching fractions Γ η ′ ( 958 ) → e + e − ⋅ B η ′ ( 958 ) → π + π − η ⋅ B η → γ γ 0.00041 eV at 90% C.L.

Published
2015

13. Study of the process e+e−→3(π+π−) in the c.m. energy range 1.5–2.0 GeV with the CMD-3 detector

Author

E.A. Perevedentsev, A.S. Kasaev, V.Sh. Banzarov, S.S. Gribanov, A.N. Amirkhanov, A.L. Erofeev, P.A. Lukin, S.V. Karpov, Yu.V. Yudin, I.B. Logashenko, D. Epifanov, A.E. Bondar, A.S. Kuzmin, G.P. Razuvaev, A. V. Semenov, F.V. Ignatov, E. P. Solodov, D.N. Shemyakin, A.A. Korobov, S.I. Eidelman, Ilya Zemlyansky, Alexey Talyshev, V.M. Aulchenko, M.V. Timoshenko, D.E. Berkaev, E.A. Kozyrev, Vassili Kazanin, A.A. Grebenuk, Alexey Anisenkov, A.N. Kozyrev, L.B. Epshteyn, D. B. Shwartz, P. Krokovny, A.L. Sibidanov, B.A. Shwartz, A.E. Ryzhenenkov, A.V. Bragin, R.R. Akhmetshin, V.S. Okhapkin, D.N. Grigoriev, F. Grancagnolo, A. P. Lysenko, I. A. Koop, N.S. Bashtovoy, V.M. Titov, G.V. Fedotovich, V.E. Shebalin, A.I. Vorobiov, V. L. Ivanov, A.S. Popov, K.Yu. Mikhailov, Yu. M. Shatunov, S.E. Gayazov, A.A. Ruban, A.E. Kuzmenko, Yu.N. Pestov, and N.M. Ryskulov

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Range (particle radiation), law, Electron–positron annihilation, Detector, Intermediate state, Atomic physics, Collider, Energy (signal processing), law.invention
Abstract

The cross section of the process e + e − → 3 ( π + π − ) π 0 has been measured for the first time using a data sample of 56.7 pb−1 collected with the CMD-3 detector at the VEPP-2000 e + e − collider. 632±32 signal events have been selected in the center-of-mass energy range 1.6–2.0 GeV. A study of dynamics of seven-pion production allows one to extract contributions of the dominated 2 ( π + π − ) ω and 2 ( π + π − ) η intermediate states.

Published
2013

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