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1. Measurement of the e+e − → ηπ + π − cross section with the CMD-3 detector at the VEPP-2000 collider

Author

CMD-3 collaboration, S. S. Gribanov, A. S. Popov, 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, D. N. Grigoriev, F. V. Ignatov, V. L. Ivanov, S. V. Karpov, V. F. Kazanin, A. N. Kirpotin, I. A. Koop, A. A. Korobov, O. A. Kovalenko, 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, G. P. Razuvaev, Yu. A. Rogovsky, A. A. Ruban, N. M. Ryskulov, A. E. Ryzhenenkov, A. V. Semenov, 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, S. S. Tolmachev, A. I. Vorobiov, I. M. Zemlyansky, and Yu. V. Yudin

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

Abstract The cross section of the process e + e − → ηπ + π − is measured using the data collected with the CMD-3 detector at the VEPP-2000 collider in the center-of-mass energy range from 1.1 to 2.0 GeV. The decay mode η → γγ is used for η meson reconstruction in the data sample corresponding to an integrated luminosity of 78.3 pb −1. The energy dependence of the e + e − → ηπ + π − cross section is fitted within the framework of vector meson dominance in order to extract the Γ(ρ(1450) → e + e − ) B $$ \mathcal{B} $$ (ρ(1450) → ηπ + π − ) and the Γ(ρ(1700) → e + e − ) B $$ \mathcal{B} $$ (ρ(1700) → ηπ + π − ) products. Based on conservation of vector current, the analyzed data are used to test the relationship between the e + e − → ηπ + π − cross section and the spectral function in τ − → ηπ − π 0 ντ decay. The e + e − → ηπ + π − cross section obtained with the CMD-3 detector is in good agreement with the previous measurements.

Published
2020
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2. 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

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. Production of four charged pions with the CMD-3 detector at the VEPP-2000 collider

Author

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

Subjects
Physics, Nuclear physics, Pion, law, Detector, Collider, VEPP-2000, law.invention
Published
2020

5. Measurement of the e+e−→ ηπ+π− cross section with the CMD-3 detector at the VEPP-2000 collider

Author

CMD-3 collaboration, S. S. Gribanov, A. S. Popov, 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, D. N. Grigoriev, F. V. Ignatov, V. L. Ivanov, S. V. Karpov, V. F. Kazanin, A. N. Kirpotin, I. A. Koop, A. A. Korobov, O. A. Kovalenko, 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, G. P. Razuvaev, Yu. A. Rogovsky, A. A. Ruban, N. M. Ryskulov, A. E. Ryzhenenkov, A. V. Semenov, 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, S. S. Tolmachev, A. I. Vorobiov, I. M. Zemlyansky, and Yu. V. Yudin

Subjects
Physics, Nuclear and High Energy Physics, e+-e- Experiments, Luminosity (scattering theory), Meson, 010308 nuclear & particles physics, Electron–positron annihilation, Vector meson dominance, 01 natural sciences, law.invention, Nuclear physics, Cross section (physics), law, 0103 physical sciences, lcsh:QC770-798, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, Vector meson, 010306 general physics, Collider, VEPP-2000
Abstract

The cross section of the process e + e − → ηπ + π − is measured using the data collected with the CMD-3 detector at the VEPP-2000 collider in the center-of-mass energy range from 1.1 to 2.0 GeV. The decay mode η → γγ is used for η meson reconstruction in the data sample corresponding to an integrated luminosity of 78.3 pb −1. The energy dependence of the e + e − → ηπ + π − cross section is fitted within the framework of vector meson dominance in order to extract the Γ(ρ(1450) → e + e − ) B $$ \mathcal{B} $$ (ρ(1450) → ηπ + π − ) and the Γ(ρ(1700) → e + e − ) B $$ \mathcal{B} $$ (ρ(1700) → ηπ + π − ) products. Based on conservation of vector current, the analyzed data are used to test the relationship between the e + e − → ηπ + π − cross section and the spectral function in τ − → ηπ − π 0 ντ decay. The e + e − → ηπ + π − cross section obtained with the CMD-3 detector is in good agreement with the previous measurements.

Published
2020

6. On the Possibility of Acceleration of Polarized Protons in the Synchrotron Nuclotron

Author

Yu. M. Shatunov, P. Yu. Shatunov, A. V. Otboev, I. A. Koop, and S. P. Mane

Subjects
Physics, Nuclear and High Energy Physics, Nuclotron, Radiation, Nuclear Theory, Proton Synchrotron, Atomic and Molecular Physics, and Optics, Synchrotron, law.invention, Nuclear physics, Acceleration, law, Physics::Accelerator Physics, Radiology, Nuclear Medicine and imaging, Nuclear Experiment, Spin-½
Abstract

One of the main tasks of the NICA project is to produce colliding beams of polarized protons. It is planned to accelerate polarized protons from the source to the maximum energy in the existing proton synchrotron. We consider all depolarizing spin resonances in the Nuclotron and propose methods to overcome them.

Published
2018

7. 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

8. 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

9. Status and perspectives of the VEPP-2000

Author

A. I. Senchenko, Ilya Zemlyansky, A. V. Otboev, E.A. Perevedentsev, A. P. Lysenko, Yu. M. Shatunov, Yu. M. Zharinov, P. Yu. Shatunov, A.N. Skrinsky, D.E. Berkaev, I. A. Koop, D.B. Shwartz, A.L. Romanov, Yu. A. Rogovsky, A. N. Kyrpotin, Vasiliy Prosvetov, and A. S. Kasaev

Subjects
Physics, High peak, Nuclear and High Energy Physics, Radiation, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Electron, 01 natural sciences, Atomic and Molecular Physics, and Optics, Nuclear physics, Positron, 0103 physical sciences, Physics::Accelerator Physics, High Energy Physics::Experiment, Radiology, Nuclear Medicine and imaging, 010306 general physics, VEPP-2000
Abstract

The electron-positron collider VEPP-2000 operates at BINP from 2010 year. The application of round colliding beams concept along with the accurate orbit and lattice correction yielded the high peak luminosity of 1.2 × 1031 cm−2 s−1 at 500MeV. The peak luminosity limited only by beam-beam effects, while average luminosity–by present lack of positrons in whole energy range of 160–1000 MeV. To perform high luminosity at high energies the top-up injection is needed. At present new electron and positron injection complex at BINP is commissioned and ready to feed VEPP-2000 collider with intensive beams with energy of 450MeV.

Published
2016

10. Acceleration of polarized electrons UPTO ultrahigh energies

Author

A. V. Otboev, Yu. M. Shatunov, Ivan Koop, S. R. Mane, and P. Shatunov

Subjects
Physics, Nuclear and High Energy Physics, Radiation, 010308 nuclear & particles physics, business.industry, Beam polarization, Electron, Polarization (waves), 01 natural sciences, Atomic and Molecular Physics, and Optics, Synchrotron, Cathode, law.invention, Nuclear physics, Optics, law, 0103 physical sciences, Radiative transfer, Physics::Accelerator Physics, Radiology, Nuclear Medicine and imaging, 010306 general physics, business
Abstract

A wide world discussion have been opened few years ago about future e + e − collider after the Higgsboson discovery. Besides utterly high luminosity this machine has to operate with polarized beams. We shall overview in this paper problems and practical possibilities to satisfy second requirements of the future collider. The radiative beam polarization at this 100 km machine will be very long procedure. On other side, at the present time there are developed intensive polarized electron sources based on ArGa photo cathodes with polarization about 90 percents. We show, that fast electron synchrotron equipped pair Siberian Snake is able to provide to accelerate polarized electrons up to the top energy of the collider.

Published
2016

11. Experimental input from $e^+e^-$ machines to hadronic contribution to muon (g-2)

Author

A.A. Korobov, Vassili Kazanin, S.E. Gayazov, A.A. Ruban, K.V. Pugachev, V. B. Golubev, A.E. Kuzmenko, E. V. Pakhtusova, A. N. Kirpotin, A. I. Senchenko, D.N. Shemyakin, V.M. Aulchenko, R.A. Litvinov, F.V. Ignatov, B.A. Shwartz, A.N. Kozyrev, A.S. Kupich, S. I. Serednyakov, A.V. Bragin, A. E. Obrazovsky, A.E. Ryzhenenkov, Aleksandr Korol, R.R. Akhmetshin, Konstantin Beloborodov, Alexey Anisenkov, P. Krokovny, A.Yu. Barnyakov, D.E. Berkaev, V.S. Okhapkin, Alexander Bogdanchikov, S.S. Gribanov, A.L. Erofeev, A.S. Kuzmin, Semen Eidelman, N. A. Melnikova, A. V. Berdyugin, N.S. Bashtovoy, D. B. Shwartz, L. V. Kardapoltsev, A.L. Sibidanov, A.A. Grebenuk, I.B. Logashenko, Yu.N. Pestov, A. A. Botov, S.V. Koshuba, S. S. Tolmachev, V. P. Druzhinin, D.N. Grigoriev, A.S. Popov, M. N. Achasov, A.N. Amirkhanov, S.V. Karpov, L.B. Epshteyn, K. A. Martin, Ilya Zemlyansky, A. V. Otboev, K.Yu. Mikhailov, N.M. Ryskulov, Yu.V. Yudin, T. V. Dimova, A.E. Bondar, Yu. M. Shatunov, G.P. Razuvaev, D.A. Epifanov, D. A. Shtol, I. K. Surin, Alexey Talyshev, E.A. Kozyrev, V.Sh. Banzarov, D.P. Kovrizhin, Alexey Kharlamov, V.E. Shebalin, A.I. Vorobiov, V. L. Ivanov, P.A. Lukin, V.M. Titov, P. Yu. Shatunov, Z. K. Silagadze, G.V. Fedotovich, I. A. Koop, and E. P. Solodov

Subjects
Physics, Particle physics, Muon, 010308 nuclear & particles physics, QC1-999, Electron–positron annihilation, 0103 physical sciences, Hadron, High Energy Physics::Experiment, 010306 general physics, 01 natural sciences, Standard Model
Abstract

Precise study of the hadrons production in \bm{e^+e^-}𝐞+𝐞− annihilation at low energies provides important information about interactions of light quarks and spectroscopy of their bound states. These studies are especially important for theoretical calculations of the muon \bm{(g-2)}(𝐠−2) via the Standard Model because of the present difference between theoretical and experimental values exceeds three standard deviations. In this report we will discuss current status and recent results obtained by the CMD-3 experiment and will give a brief look to status of the BaBar and Belle II experiments.

Published
2019

12. Study of π+π−π+π− production with CMD-3 detector at the VEPP-2000 collider

Author

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

Subjects
Physics, Range (particle radiation), Luminosity (scattering theory), Muon, Anomalous magnetic dipole moment, QC1-999, Hadron, Electron, 01 natural sciences, 010305 fluids & plasmas, law.invention, Nuclear physics, law, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics, Collider, VEPP-2000
Abstract

The cross section of the process e+e−→ π+π−π+π− has been measured using an integrated luminosity of 17 pb−1 collected with the CMD-3 detector in the center-of-mass energy range 650-1000 MeV. High-precision measurements of various hadronic cross sections are of great interest in relation with the problem of the muon anomalous magnetic moment g-2. This measurement can be also used to test the relation between the cross section of e+e−→ π+ π−π+ π− and the spectral function for the τ−→ π−π0π0π0 decay predicted by the conservation of vector current (CVC).

Published
2019

13. Recent results of the hadronic cross section measurements with the CMD-3 detector at e+e− collider VEPP-2000

Author

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

Subjects
Physics, Luminosity (scattering theory), Meson, 010308 nuclear & particles physics, QC1-999, Hadron, Detector, Nuclear Theory, Form factor (quantum field theory), Dalitz plot, 01 natural sciences, law.invention, Nuclear physics, law, 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics, Collider, Nuclear Experiment, VEPP-2000
Abstract

A brief review of the recent results on the hadronic cross section measurements with the CMD-3 detector at the e+e− collider VEPP-2000 is given. Focus is made on the processes with charged kaons in multihadron events, which have a strong impact on strange meson spectroscopy and form factors that are important ingredients in the Dalitz plot analysis. Experimental data relevant to the topic are presented from the broad energy range covered by VEPP-2000 and compared to earlier measurements by the different collaborations. The analysis is based on the integrated luminosity of about 100 pb−1 collected in 2011, 2012 and 2017.

Published
2019

14. CMD-3 Overview

Author

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

Subjects
Physics, Range (particle radiation), Muon, 010308 nuclear & particles physics, Physics::Instrumentation and Detectors, QC1-999, Detector, Hadron, 01 natural sciences, law.invention, Calorimeter, Nuclear physics, Upgrade, law, 0103 physical sciences, Physics::Accelerator Physics, High Energy Physics::Experiment, 010306 general physics, Collider, Nuclear Experiment, Energy (signal processing)
Abstract

The CMD-3 detector is installed at the VEPP-2000 e+e− collider at BINP (Novosibirsk, Russia). It is a general-purpose detector, equipped with a tracking system, two crystal (CSI and BGO) calorimeters, liquid Xe calorimeter, TOF and muon systems. The main goal of experiments at CMD-3 is a study of exclusive modes of e+e−→ hadrons at energies $ \sqrt s \le $ GeV. In particular, these results provide an important input for calculation of the hadronic contribution to the muon anomalous magnetic moment. The first round of data taking was performed in 2011–2013, when about 60 1/pb were taken in the center-of-mass (c.m.) energy range from 0.32 to 2.0 GeV. Here we present a survey of results of data analysis. Between 2013 and 2016 the collider and the detector were upgraded. The data taking resumed by the end of 2016. In the first run after the upgrade about 50 1/pb were collected at the energy range between 1.28 and 2.007 GeV. We discuss the upgrade and the first preliminary results from the new data.

Published
2019

15. Study of the process e+e−→ K+K−π0 in the center-of-mass energy range 1.2–2 GeV with the CMD-3 detector

Author

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

Subjects
Physics, Nuclear physics, Range (particle radiation), law, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Electron–positron annihilation, QC1-999, Detector, Center of mass, Collider, Energy (signal processing), law.invention
Abstract

The process e+ e−→ K+ K−π0 has been studied in the center-of-mass energy range from 1.2 to 2 GeV using a 80.6 pb−1 data sample collected with the CMD-3 detector at the electron-positron collider VEPP-2000. Preliminary results of the cross-section measurement are presented.

Published
2019

16. 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

17. 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

18. Study of the process e + e − → K S K ± π ∓ with CMD-3 detector

Author

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

Subjects
Nuclear physics, Physics, Detector, Process (computing), Condensed Matter Physics, Mathematical Physics, Atomic and Molecular Physics, and Optics
Published
2020

19. Measurement of the e+e−→KSKLπ0 cross section in the energy range s=1.3–2.0 GeV

Author

K. A. Martin, A. S. Kupich, A. V. Otboev, A. I. Senchenko, L. V. Kardapoltsev, V. M. Aulchenko, D. B. Shwartz, A. E. Obrazovsky, M. N. Achasov, A. S. Kasaev, Yu. V. Usov, I. K. Surin, N. A. Melnikova, V. B. Golubev, Alexey Kharlamov, Dmitry Berkaev, Yu. M. Shatunov, Alexander Bogdanchikov, K. V. Pugachev, T. V. Dimova, Konstantin Beloborodov, Ivan Koop, Dmitry Shtol, S. I. Serednyakov, A. N. Kirpotin, A. A. Botov, Yu. A. Rogovsky, A. Yu. Barnyakov, E. V. Pakhtusova, A. V. Vasiljev, Z. K. Silagadze, V. P. Druzhinin, D. P. Kovrizhin, L. A. Korneev, A. V. Berdyugin, S. V. Koshuba, and A. A. Korol

Subjects
Physics, Cross section (physics), Particle physics, Range (particle radiation), 010308 nuclear & particles physics, 0103 physical sciences, 010306 general physics, 01 natural sciences, Energy (signal processing), Luminosity
Abstract

The ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}}$ cross section is measured in the center-of-mass energy range 1.05--2.00 GeV at the SND detector. The measurement is based on data with an integrated luminosity of $35\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$ collected at the VEPP-2000 ${e}^{+}{e}^{\ensuremath{-}}$-collider. The obtained results are consistent with the previous most accurate data obtained in the BABAR experiment and have a comparable accuracy.

Published
2018

20. Study of the e+e- -> hadrons reactions with CMD-3 detector at VEPP-2000 collider

Author

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

Subjects
Physics, Muon, Luminosity (scattering theory), Anomalous magnetic dipole moment, Electron–positron annihilation, Hadron, law.invention, Nuclear physics, Pion, law, High Energy Physics::Experiment, Nuclear Experiment, Collider, VEPP-2000
Abstract

The CMD-3 detector is taking data at the VEPP-2000 $e^+e^-$ collider (Budker INP, Novosibirsk, Russia). The main goal of experiments with CMD-3 is the measurement of the cross-sections and dynamics of the exclusive modes of $e^+e^- \to hadrons$ reactions. In particular, these results provide important input for calculation of the hadronic contribution to the muon anomalous magnetic moment. First round of data taking with the CMD-3 detector was performed in 2011-2013 with about 60 1/pb integrated luminosity in the energy range from 0.32 to 2.0 GeV in center-of-mass. Amount of collected data exceeds all previous experiments. Here we present the survey of results of data taken in 2011-2013, including precise measurement of $e^+e^-\to \pi^+\pi^-$ reaction, as well as other hadron final states with up to 6 pions or states include 2 kaons. At the end of 2016 the VEPP-2000 collider resumed operations after upgrade of the injection system, and performance approaching to the project luminosity of $10^{32}\ cm^{-2}s^{-1}$ at 2 GeV has been demonstrated. First preliminary results of new 2017 run are also presented.

Published
2017

21. Current status of luminosity measurement with the CMD-3 detector at the VEPP-2000 collider

Author

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

Subjects
Physics, Range (particle radiation), Photon, Luminosity (scattering theory), 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, QC1-999, Detector, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, law.invention, Nuclear physics, law, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics, Collider, VEPP-2000, Astrophysics::Galaxy Astrophysics, Energy (signal processing)
Abstract

The CMD-3 detector started data taking at the electron-positron collider VEPP-2000 [1] in December 2010. The collected data sample corresponds to an integrated luminosity of 87 pb−1 in the c.m. energy range from 1.06 up to 2 GeV and 91 pb−1 from 0.32 to 1.06 GeV. The integrated luminosity was measured by counting e+e−→ e+e− and e+e−→ γγ events, allowing additional photons in the final state. Preliminary results of the luminosity measurement are presented for various energy ranges and its accuracy is estimated to be 1%.

Published
2019

22. Search for the process e+e−→D*(2007) with the CMD-3 detector

Author

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

Subjects
Physics, 010308 nuclear & particles physics, QC1-999, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Electron–positron annihilation, 0103 physical sciences, Detector, Analytical chemistry, 010306 general physics, 01 natural sciences, Luminosity
Abstract

A search for the process e+e−→ D*0(2007) has been performed with the CMD-3 detector at the VEPP-2000 e+e−-collider. Two main decay modes of the D*0(2007) decay, D0π0 and D0γ, followed by D0 → K+π−π+π−are used in this analysis. With an integrated luminosity of 3.7 pb−1 collected at the center-of-mass energy Ec.m. =2006.62 MeV our preliminary upper limit is BD*0→e+ e− −6 at 90%C.L.

Published
2019

23. First results of spherical neutral detector (SND) experiments at VEPP-2000

Author

Yu. M. Shatunov, A. V. Otboev, K. Yu. Skovpen, Konstantin Beloborodov, D.E. Berkaev, K.I. Grevtsov, D.A. Bukin, V. P. Druzhinin, D. B. Shwartz, K. A. Martin, Sergey Serednyakov, A. E. Obrazovsky, A.V. Vasiljev, I. A. Koop, V. B. Golubev, L.V. Kardapoltsev, Alexander Bogdanchikov, Z. K. Silagadze, I.K. Surin, E. V. Pakhtusova, Yu. M. Zharinov, D. P. Kovrizhin, A.N. Skrinsky, A.G. Kharlamov, Yu. A. Tikhonov, P. Yu. Shatunov, S. V. Koshuba, A. V. Berdyugin, M. N. Achasov, T. V. Dimova, A. Yu. Barnyakov, Aleksandr Korol, Dmitry Shtol, A. A. Botov, E. A. Kravchenko, and A. L. Romanov

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Range (particle radiation), Annihilation, Luminosity (scattering theory), law, Detector, Center of mass, Atomic physics, Collider, VEPP-2000, law.invention
Abstract

Preliminary results of the first experiments at the new VEPP-2000 e + e − collider are presented. The experiments have been carried out in the center of mass energy range 1–2 GeV with instant luminosity 10 30 – 10 31 cm − 2 s − 1 and total integrated luminosity of about 10 pb − 1 . The main e + e − annihilation cross sections, π + π − π 0 π 0 , π + π − π 0 , π 0 π 0 γ , a n d π + π − η , have been measured. The cross section of nucleon–antinucleon production is also presented.

Published
2012

24. Search for the ϕ → π+π−γγ and ϕ → π+π−η decays with the CMD-2 detector

Author

P. A. Lukin, B. Sh. Banzarov, P. P. Krokovny, Yu.V. Yudin, F. V. Ignatov, V. S. Okhapkin, K.Yu. Mikhailov, V. M. Aulchenko, A. S. Popov, D. N. Grigor’ev, B. I. Khazin, S. I. Redin, Yu. M. Shatunov, L. M. Barkov, A. E. Bondar, A. A. Grebenyuk, A. S. Kuzmin, A. V. Bragin, B.A. Shvarts, A. S. Zaitsev, R. R. Akhmetshin, N. M. Ryskulov, Sergei V. Karpov, Vladimir Smakhtin, E. A. Perevedentsev, N. S. Bashtovoi, I. Logashenko, E. P. Solodov, A. L. Sibidanov, I. Nesterenko, D. A. Epifanov, I. G. Snopkov, A. V. Otboev, Semen Eidelman, A. A. Ruban, V. F. Kazanin, G. V. Fedotovich, and I. A. Koop

Subjects
Physics, Nuclear physics, Physics and Astronomy (miscellaneous), Solid-state physics, Detector, Branching (polymer chemistry)
Abstract

The ϕ → π+π−γγ and ϕ → π+π−η decays are sought in the experimental data obtained with the CMD-2 detector in the region of the ϕ-meson resonance. Upper limits ℛ(ϕ → ππγγ)< 1.2 × 10−4 and ℛ(ϕ → ππη) < 6.1 × 10−5 (both at a C.L. of 90%) are determined for the branching ratios of these decays.

Published
2008

25. Search for theη′→e+e−decay with the SND detector

Author

V. B. Golubev, Yu. M. Shatunov, Dmitry Berkaev, A. Yu. Barnyakov, A. V. Vasiljev, A. A. Korol, A. N. Kirpotin, N. Yu. Muchnoi, Alexey Kharlamov, Ivan Koop, D. P. Kovrizhin, S. V. Koshuba, L. V. Kardapoltsev, D. B. Shwartz, M. N. Achasov, A. S. Kasaev, Yu. A. Tikhonov, S. I. Serednyakov, T. V. Dimova, Konstantin Beloborodov, Ilya Zemlyansky, A. E. Obrazovsky, Dmitry Shtol, Yu. V. Usov, A. V. Berdyugin, A. I. Senchenko, E. V. Pakhtusova, Z. K. Silagadze, K. A. Martin, A. S. Kupich, A. V. Otboev, V. P. Druzhinin, A. A. Botov, I. K. Surin, Alexander Bogdanchikov, V. M. Aulchenko, and P. Yu. Shatunov

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Meson, law, High Energy Physics::Experiment, Nuclear Experiment, Collider, Energy (signal processing), Luminosity, law.invention
Abstract

A search for the process $e^+e^- \to \eta^\prime$ has been performed with the SND detector at the VEPP-2000 $e^+e^-$ collider. The data were accumulated at the center-of-mass energy of $957.78\pm 0.06$ MeV with an integrated luminosity of about 2.9 pb$^{-1}$. For reconstruction of the $\eta^\prime$ meson five decay chains have been used: $\eta^{\prime}\to\eta\pi^+\pi^-$ followed by the $\eta$ decays to $\gamma\gamma$ and $3\pi^0 $, and $\eta^{\prime} \to \eta\pi^0\pi^0$ followed by the $\eta$ decays to $\pi^+\pi^-\pi^0$, $\gamma\gamma$, and $3\pi^0$. As a result, the upper limit has been set on the $\eta^\prime$ electronic width: $\Gamma_{\eta^{\prime}\to e^+e^-} < 0.0020$ eV at the 90\% confidence level.

Published
2015

26. Study of ϕ→π+π−π0 with CMD-2 detector

Author

N.I. Root, D.A. Gorbachev, A. Bondar, Yu. M. Shatunov, D. V. Bondarev, K.Yu. Mikhailov, Igor Nesterenko, A.S. Zaitsev, A. P. Lysenko, R.R. Akhmetshin, E. P. Solodov, S.I. Eidelman, A. V. Otboev, G.V. Fedotovich, S.V. Karpov, A.V. Bragin, V.A. Sidorov, P. Krokovny, A.A. Ruban, N.M. Ryskulov, B.A. Shwartz, Fedor Ignatov, S.I. Redin, Vassili Kazanin, D. Epifanov, Yu.V. Yudin, I. Logashenko, S.G. Zverev, B.I. Khazin, A.S. Kuzmin, E.A. Perevedentsev, V.S. Okhapkin, I.G. Snopkov, L.M. Barkov, N.S. Bashtovoy, M.A. Nikulin, D.N. Grigoriev, I. A. Koop, V.M. Aulchenko, A.N. Skrinsky, A.A. Grebeniuk, P.A. Lukin, N. Gabyshev, V.Sh. Banzarov, A. I. Milstein, Vladimir Smakhtin, A.S. Popov, and A.L. Sibidanov

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Electron–positron annihilation, Detector, Dalitz plot, law.invention, Nuclear physics, Cross section (physics), Amplitude, law, Atomic physics, Collider, Positron annihilation
Abstract

The cross section of the process e+e−→π+π−π0 has been measured in the c.m. energy range 984–1060 MeV with the CMD-2 detector at the VEPP-2M collider. The obtained value of Br(ϕ→e+e−)Br(ϕ→π+π−π0)=(4.51±0.16±0.11)×10−5 is in good agreement with the previous measurements and has the best accuracy. Analysis of the Dalitz plot was performed. The contributions of the dominant ϕ→ρπ mechanism as well as of a small direct ϕ→3π amplitude were determined.

Published
2006

27. Experimental study of the reaction e + e − → K S K L in the energy range √S = 1.04−1.38 GeV

Author

A. V. Otboev, V. P. Druzhinin, Konstantin Beloborodov, D.A. Bukin, E. V. Pakhtusova, A.N. Skrinsky, A. V. Berdyugin, V. B. Golubev, Yu. M. Shatunov, S. V. Koshuba, Z. K. Silagadze, A. P. Lysenko, Ivan Koop, Vladimir A. Sidorov, A. A. Korol, A. V. Bozhenok, M. N. Achasov, S. I. Serednyakov, A. V. Vasiliev, and T. V. Dimova

Subjects
Physics, Range (particle radiation), Particle physics, Meson, General Physics and Astronomy, High Energy Physics::Experiment, Vector meson dominance, Nuclear Experiment, Omega, Energy (signal processing)
Abstract

We present a measurement of the $e^+e^-\to K_SK_L$ cross section in the energy range $\sqrt{s}=1.04 \div 1.38$ GeV. For the energy $\sqrt{s}\geq 1.2$ GeV the cross section exceeds vector meson dominance model predictions with only $\rho(770)$, $\omega(783)$, and $\phi(1020)$ mesons taken into account. Measured cross section agrees well with previous measurements.

Published
2006

28. Study of the process e + e − → π+π− in the energy region $$400 < \sqrt s < 1000 MeV^\P $$

Author

M. N. Achasov, K. I. Beloborodov, A. V. Berdyugin, A. G. Bogdanchikov, A. V. Bozhenok, A. D. Bukin, D. A. Bukin, T. V. Dimova, V. P. Druzhinin, V. B. Golubev, I. A. Koop, A. A. Korol, S. V. Koshuba, A. P. Lysenko, A. V. Otboev, E. V. Pakhtusova, S. I. Serednyakov, Yu. M. Shatunov, V. A. Sidorov, Z. K. Silagadze, A. N. Skrinsky, Yu. A. Tikhonov, and A. V. Vasiljev

Subjects
Physics, Systematic error, Particle physics, Degree (graph theory), Pi, General Physics and Astronomy, Omega, Energy (signal processing)
Abstract

The cross section of the process e^+e^-\to \pi^+\pi^- was measured in the SND experiment at the VEPP-2M collider in the energy region 400

Published
2005

29. Measurement of the pion form factor in the range 1.04–1.38 GeV with the CMD-2 detector

Author

V. M. Aul’chenko, R. R. Akhmetshin, V. Sh. Banzarov, L. M. Barkov, N. S. Bashtovoi, D. V. Bondarev, A. E. Bondar’, A. V. Bragin, A. A. Valishev, N. I. Gabyshev, D. A. Gorbachev, A. A. Grebenyuk, D. N. Grigor’ev, S. K. Dhawan, D. A. Epifanov, A. S. Zaitsev, S. G. Zverev, F. V. Ignatov, V. F. Kazanin, S. V. Karpov, I. A. Koop, P. P. Krokovny, A. S. Kuz’min, I. B. Logashenko, P. A. Lukin, A. P. Lysenko, A. I. Mil’shtein, K. Yu. Mikhailov, I. N. Nesterenko, M. A. Nikulin, A. V. Otboev, V. S. Okhapkin, E. A. Perevedentsev, A. A. Polunin, A. S. Popov, S. I. Redin, B. L. Roberts, N. I. Root, A. A. Ruban, N. M. Ryskulov, A. L. Sibidanov, V. A. Sidorov, A. N. Skrinsky, V. P. Smakhtin, I. G. Snopkov, E. P. Solodov, J. A. Thompson, G. V. Fedotovich, B. I. Khazin, V. W. Hughes, A. G. Shamov, Yu. M. Shatunov, B. A. Shwartz, S. I. Éidel’man, and Yu. V. Yudin

Subjects
Physics, Particle physics, Range (particle radiation), Pion, Physics and Astronomy (miscellaneous), Detector, Form factor (quantum field theory), Energy (signal processing), High Energy Physics - Experiment
Abstract

The cross section for the process $e^+e^-\to\pi^+\pi^-$ is measured in the c.m. energy range 1.04-1.38 GeV from 995 000 selected collinear events including 860000 $e^+e^-$ events, 82000 $\mu^+\mu^-$ events, and 33000 $\pi^+\pi^-$ events. The systematic and statistical errors of measuring the pion form factor are equal to 1.2-4.2 and 5-13%, respectively., Comment: 5 pages, 2 figures

Published
2005

30. Study of the processes e+e−→ηγ, π0γ→3γ in the c.m. energy range 600–1380 MeV at CMD-2

Author

S.I. Eidelman, E.P. Solodov, V.A. Sidorov, K.Yu. Mikhailov, A.S. Popov, D.N. Grigoriev, S.G. Zverev, I.N. Nesterenko, F.V. Ignatov, A.A. Grebeniuk, D.V. Bondarev, A. Baratt, B.A. Shwartz, A.N. Skrinsky, A.S. Zaitsev, Yu.E. Lischenko, N.M. Ryskulov, A.G. Shamov, I.A. Koop, I.G. Snopkov, A.A. Ruban, A.E. Bondar, Yu.V. Yudin, D.A. Gorbachev, N.I. Gabyshev, L.M. Barkov, B.L. Roberts, V.S. Okhapkin, R.R. Akhmetshin, G.V. Fedotovitch, P.A. Lukin, Yu. M. Shatunov, B.I. Khazin, P.P. Krokovny, A.S. Kuzmin, S.V. Karpov, A.V. Bragin, D.A. Epifanov, S. I. Redin, A. A. Valishev, A.I. Milstein, V.F. Kazanin, V.Sh. Banzarov, J.A. Thompson, A.L. Sibidanov, N.S. Bashtovoy, V.M. Aulchenko, I.B. Logashenko, N.I. Root, and A. V. Otboev

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Branching fraction, Electron–positron annihilation, 0103 physical sciences, Analytical chemistry, Dalitz plot, Atomic physics, 010306 general physics, 01 natural sciences, Positron annihilation
Abstract

The processes e + e − → η γ , π 0 γ → 3 γ have been studied in the c.m. energy range 600–1380 MeV with the CMD-2 detector. The following branching ratios have been determined: B ( ρ 0 → η γ ) = ( 3.21 ± 1.39 ± 0.20 ) × 10 −4 , B ( ω → η γ ) = ( 4.44 −1.83 +2.59 ± 0.28 ) × 10 −4 , B ( ϕ → η γ ) = ( 1.373 ± 0.014 ± 0.085 ) × 10 −2 , B ( ρ 0 → π 0 γ ) = ( 6.21 −1.18 +1.28 ± 0.39 ) × 10 −4 , B ( ω → π 0 γ ) = ( 9.06 ± 0.20 ± 0.57 ) × 10 −2 , B ( ϕ → π 0 γ ) = ( 1.258 ± 0.037 ± 0.077 ) × 10 −3 .

Published
2005

31. Self-polarizing electron ring for eRHIC project

Author

A. V. Otboev, Yu. M. Shatunov, and Vadim Ptitsyn

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Luminosity (scattering theory), Scattering, Electron, Inelastic scattering, Deep inelastic scattering, Polarization (waves), Nuclear physics, Radiative transfer, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment, Instrumentation
Abstract

We present the electron storage ring for an arrangement of electron–proton and electron–ion collisions at RHIC. High degree of radiative electron polarization will be achieved at the beam energy range 5–10 GeV with characteristic time about 10 min. Required luminosity of polarized e–p collisions for studies of deep inelastic scattering is 1×1033 cm−2 s−1 in the SCM energy range 15–100 GeV.

Published
2005

32. Measurement of the relative probability of the decay φ → η′γ in the channel η′ → ηπ0π0, η → γγ

Author

V. B. Golubev, Yu. M. Shatunov, Alexander Bogdanchikov, Ivan Koop, A. V. Bozhenok, A. V. Vasil’ev, V. P. Druzhinin, A. V. Otboev, Z. K. Silagadze, A. P. Lysenko, V.A. Sidorov, V. N. Ivanchenko, S. I. Serednyakov, M. N. Achasov, A. D. Bukin, T.V. Dimova, S.V. Koshuba, A. A. Salnikov, V. M. Aulchenko, E. V. Pakhtusova, S.E. Baru, Konstantin Beloborodov, D.A. Bukin, V. V. Shary, A. V. Berdyugin, and A. A. Korol

Subjects
Nuclear physics, Physics, Particle decay, Antiparticle, Annihilation, Pion, Meson, Antimatter, Hadron, General Physics and Astronomy, Lepton
Abstract

The process e + e − → η′γ, η′ → η π0π0, η → γγ is investigated by an SND detector in experiment on a VEPP-2M equipment with colliding electron-positron beams. The analysis of experimental data yields a value of B(ϕ → η′γ)=(6.7 −4.2 +5.0 ±1.5)×10−5 for the decay probability. Taking into account a previous measurement of this quantity by an SND detector in the decay channel η′ → π+π−η, one finally obtains B(ϕ→η ′γ)=(6.7 −2.4 +2.8 ±0.8)×10−5.

Published
2003

33. Search for the radiative decay η→π0γγ in the SND experiment at VEPP-2M

Author

A. V. Otboev, M. N. Achasov, Vladimir A. Sidorov, S. V. Koshuba, Z. K. Silagadze, T.V. Dimova, Alexander Bogdanchikov, Sergey Serednyakov, Yu. S. Velikzhanin, V. N. Ivanchenko, Yu. M. Shatunov, E. V. Pakhtusova, Sergey Burdin, Konstantin Beloborodov, A. V. Berdyugin, D.A. Bukin, A. A. Salnikov, A. A. Korol, V. V. Shary, A.A. Drozdetsky, A. V. Bozhenok, A. V. Vasiljev, Ivan Koop, A. G. Skripkin, V. B. Golubev, V. P. Druzhinin, Alexander Valishev, and D. I. Ganyushin

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Future studies, Spectrometer, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Radiative decay, Gamma gamma, law.invention, law, High Energy Physics::Experiment, Limit (mathematics), Nuclear Experiment, Collider
Abstract

The $\eta \to \pi^0 \gamma \gamma$ decay was investigated by the SND detector at VEPP-2M $e^+e^-$ collider in the reaction $e^+e^-\to\phi\to \eta\gamma$. Here we present the results and some details of this study. We report an upper limit (90% c.l.) $Br(\eta \to \pi^0 \gamma \gamma)

Published
2001

34. The process e + e − → ωπ0 near the Φ resonance

Author

A. A. Salnikov, A. G. Bogdanchikov, D. A. Bukin, M. N. Achasov, A. N. Skrinsky, V. V. Shary, E. V. Pakhtusova, A.V. Vasiljev, Yu. M. Shatunov, T.V. Dimova, S. I. Serednyakov, A. V. Bozhenok, Konstantin Beloborodov, V. A. Sidorov, P.M. Ivanov, S. V. Koshuba, I. A. Gaponenko, A. D. Bukin, A. A. Drozdetsky, V. B. Golubev, A. V. Berdyugin, A. P. Lysenko, Aleksandr Korol, V. M. Aulchenko, I. A. Koop, S. V. Burdin, G.A Kukartsev, V. P. Druzhinin, M. S. Dubrovin, Vladimir Ivanchenko, Z. K. Silagadze, and A. V. Otboev

Subjects
Cross section (geometry), Physics, Nuclear physics, Solid-state physics, Meson, law, General Physics and Astronomy, Resonance, Interference wave, Atomic physics, Collider, law.invention
Abstract

The reaction e + e −→ωπ0 near a Φ resonance was studied with a spherical neutral detector at VEPP-2M e + e − collider. Both main modes of decay of a ω meson were investigated: ω→π+π−π0 and ω→π 0γ. The probability of decay Φ→ωπ0 was obtained from the magnitude of the interference wave in the cross section for the reaction e + e −→ωπ0→ π+π−π0π0: B(Φ→ωπ0) = (5.5 −1.4 +1.6 ±0.3) ×10−5. The ratio of the partial widths of the ω meson was obtained from the ratio of the cross sections for the two modes: Γ(ω→π0γ )/Γ(ω→π+π−π0) = 0.0994 ± 0.0036 ± 0.0038.

Published
2000

35. Measurement of the relative probability of φ →ηγ decay in the η → π +π−π0 channel

Author

A. A. Salnikov, V.A. Sidorov, A. V. Otboev, V. V. Sharyi, V. B. Golubev, Yu. M. Shatunov, D.A. Bukin, I.A. Gaponenko, A. V. Berdyugin, M. S. Dubrovin, S. I. Serednyakov, Vladimir Ivanchenko, D. I. Ganyushin, G. A. Kukhartsev, E.V. Pakhtusova, S.V. Burdin, Konstantin Beloborodov, A. S. Zakharov, T.V. Dimova, Z. K. Silagadze, S.V. Koshuba, A. V. Vasil’ev, A. D. Bukin, A. A. Mamutkin, Aleksandr Korol, P.M. Ivanov, S. I. Dolinskii, A. V. Bozhenok, V. P. Druzhinin, and M. N. Achasov

Subjects
Physics, Solid-state physics, Detector, General Physics and Astronomy, High Energy Physics::Experiment, Elementary particle, Field theory (psychology), Relative probability, Atomic physics, Quantum field theory, Spectroscopy, Storage ring
Abstract

The relative decay probability B(φ → ηγ) = (1.259 ± 0.030 ± 0.059)% in the decay channel η → π+π−π0 has been measured in an experiment using a spherical neutral detector in the VEPP-2M electron-positron storage ring. The result agrees with the tabulated value and with measurements of this probability using the spherical neutral detector in other η-meson decay channels.

Published
2000

36. Recent results from SND experiment at VEPP-2000 collider

Author

A. Yu. Barnyakov, D. P. Kovrizhin, Yu. A. Tikhonov, I.K. Surin, K. Yu. Skovpen, D.E. Berkaev, E. V. Pakhtusova, V. P. Druzhinin, A. S. Kasaev, A.G. Kharlamov, Yu. M. Shatunov, V. B. Golubev, S. V. Koshuba, L.V. Kardapoltsev, Z. K. Silagadze, A. V. Berdyugin, A.V. Vasiljev, Dmitry Shtol, Aleksandr Korol, Sergey Serednyakov, A. N. Kirpotin, K.I. Grevtsov, Konstantin Beloborodov, A. A. Botov, Yu. A. Rogovsky, D.A. Bukin, Yu. V. Usov, M. N. Achasov, A.A. Borisov, V. M. Aulchenko, I. A. Koop, E. A. Kravchenko, A.N. Skrinsky, D. B. Shwartz, A. E. Obrazovsky, A. P. Onuchin, T. V. Dimova, A. V. Otboev, Alexander Bogdanchikov, and K. A. Martin

Subjects
Nuclear physics, Physics, law, QC1-999, Collider, VEPP-2000, law.invention, Luminosity
Abstract

Preliminary results of the SND experiment at the VEPP-2000 e+e− collider are presented. Data corresponding to about 40 pb−1 of integrated luminosity were collected in the e+e− c.m. energy range from 1.05 to 2.00 GeV. The cross sections for e+e− → ωπ0, π+π−4π0, pp¯${m{par p}}$, nn¯${m{nar n}}$ have been measured.

Published
2012

37. High Energy Polarized e+e− Beams

Author

Yu. M. Shatunov, Ivan Koop, S. R. Mane, and A. V. Otboev

Subjects
Physics, Pair production, Wiggler, Radiative transfer, Higgs boson, Time constant, Physics::Accelerator Physics, Degree of polarization, Electron, Atomic physics, Polarization (waves)
Abstract

Recently, the wide discussion about Higgs-factory design again returns to problem of high energy polarized electrons and positrons. It’s good known the radiative beam polarization at LEP-collider. It was obtained after spin resonance suppression at [Formula: see text] pick, but didn’t appear at energies above 70 GeV due to an enhancement of unavoidable depolarization effects. We examine in this paper various ideas for radiative polarization at TLEP/FCC-ee and formulate some estimates for the polarization buildup time and the asymptotic polarization. Using wigglers, a useful degree of polarization (for energy calibration), with a time constant of about 1 h, may be possible up to the threshold of W pair production. At higher energies such as the threshold of Higgs production, attaining a useful level of polarization may be difficult in a planar ring. With Siberian Snakes, wigglers and some imagination, polarization of reasonable magnitude, with a reasonable time constant (of not more than about 1 h), may be achievable at very high energies.

Published
2016

38. Measurement of the ϕ → π0 e + e − decay probability

Author

Z. K. Silagadze, A. V. Vasil’ev, D. A. Bukin, E. V. Pakhtusova, S. I. Serednyakov, Konstantin Beloborodov, S. V. Koshuba, A. A. Mamutkin, Alexander Bogdanchikov, V. P. Druzhinin, A. V. Berdyugin, Aleksandr Korol, V. A. Sidorov, V. V. Sharyi, A. A. Valishev, S. V. Burdin, A. G. Skripkin, Yu. M. Shatunov, M. N. Achasov, Tatyana Dimova, Vladimir Ivanchenko, A. A. Salnikov, A. V. Bozhenok, P.M. Ivanov, A. V. Otboev, V. B. Golubev, A. D. Bukin, and A.N. Skrinskii

Subjects
Physics, Nuclear physics, Particle physics, Physics and Astronomy (miscellaneous), Solid-state physics, law, Detector, Value (computer science), Collider, law.invention
Abstract

The measurement of the ϕ → π0 e + e − conversion decay probability on the SND detector at the VEPP-2M e + e − collider gave the value Br(ϕ → π 0 e + e −) = (1.01 ± 0.28 ± 0.29) × 10−5.

Published
2002

39. Measurement of the e+e- -> pi+pi- cross section with the CMD-2 detector in the 370-520 MeV c.m. energy range

Author

V. M. Aul’chenko, R. R. Akhmetshin, V. Sh. Banzarov, L. M. Barkov, N. S. Bashtovoĭ, D. V. Bondarev, A. E. Bondar’, A. V. Bragin, N. I. Gabyshev, D. A. Gorbachev, A. A. Grebenyuk, D. N. Grigor’ev, S. K. Dhawan, D. A. Epifanov, A. S. Zaĭtsev, S. G. Zverev, F. V. Ignatov, V. F. Kazanin, S. V. Karpov, I. A. Koop, P. P. Krokovny, A. S. Kuz’min, I. B. Logashenko, P. A. Lukin, A. P. Lysenko, A. I. Mil’shteĭn, K. Yu. Mikhaĭlov, I. N. Nesterenko, M. A. Nikulin, A. V. Otboev, V. S. Okhapkin, E. A. Perevedentsev, A. S. Popov, S. I. Redin, B. L. Roberts, N. I. Root, A. A. Ruban, N. M. Ryskulov, A. L. Sibidanov, V. A. Sidorov, A. N. Skrinsky, V. P. Smakhtin, I. G. Snopkov, E. P. Solodov, J. A. Thompson, G. V. Fedotovich, B. I. Khazin, V. W. Hughes, A. G. Shamov, Yu. M. Shatunov, B. A. Shvarts, S. I. Éĭdel’man, and Yu. V. Yudin

Subjects
Physics, Range (particle radiation), Particle physics, Muon, Physics and Astronomy (miscellaneous), Detector, Nuclear Theory, Form factor (quantum field theory), Radius, High Energy Physics - Experiment, Nuclear physics, Cross section (physics), Pion, Pair production, High Energy Physics::Experiment, Nuclear Experiment
Abstract

The cross section of the process e+e- -> pi+pi- has been measured at the CMD-2 detector in the 370-520 MeV center-of-mass (c.m.) energy range. A systematic uncertainty of the measurement is 0.7 %. Using all CMD-2 data on the pion form factor, the pion electromagnetic radius was calculated. The cross section of muon pair production was also determined., Comment: 11 pages, 4 figures

Published
2006

40. Study of thee+e−→ηγprocess with Spherical Neutral Detector at the VEPP-2Me+e−collider

Author

M. N. Achasov, A. V. Otboev, Alexander Bogdanchikov, V. P. Druzhinin, Z. K. Silagadze, E. V. Pakhtusova, S. V. Koshuba, T. V. Dimova, V. B. Golubev, Yu. M. Shatunov, S. I. Serednyakov, A.N. Skrinsky, A. V. Berdyugin, Vladimir A. Sidorov, A. A. Korol, A. V. Bozhenok, A. V. Vasiljev, V. M. Aulchenko, Konstantin Beloborodov, and D.A. Bukin

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Luminosity (scattering theory), Astrophysics::High Energy Astrophysical Phenomena, Electron–positron annihilation, Detector, Vector meson dominance, Omega, law.invention, Nuclear physics, law, High Energy Physics::Experiment, Nuclear Experiment, Collider, Energy (signal processing)
Abstract

In experiment with the SND detector at VEPP-2M $e^+e^-$ collider the $e^+e^-\to\eta\gamma$ cross section was measured in the energy range $E$=0.60--1.38 GeV with the integrated luminosity of 27.8 pb$^{-1}$. The measured cross section is well described by the vector meson dominance model with contributions from the $\rho(770)$, $\omega(783)$, $\phi(1020)$, $\rho^{\prime}(1465)$ resonances and agrees with results of previous measurements. The decay probabilities $\BR(\phi\to\eta\gamma)$, $\BR(\omega\to\eta\gamma)$ and $\BR(\rho\to\eta\gamma)$ were measured with the accuracies better than or comparable to the world averages.

Published
2006

42. Proposal of partial Siberian snake based on helical magnets for AGS

Author

Yu. M. Shatunov, P. Yu. Shatunov, Ivan Koop, A. V. Otboev, and Evgeny Perevedentsev

Subjects
Nuclear physics, Physics, Amplitude, Proton, Magnet, Proton spin crisis, Physics::Accelerator Physics, Atomic physics, One pass, Nuclear Experiment, Polarization (waves), Magnetic analysis, Magnetic field
Abstract

A scheme of partial Siberian snake is considered for polarized proton acceleration at AGS. The snake consists of four identical helical magnets with the field amplitude about 4.0 T on axis and provides proton spin rotation by about 32 degrees per one pass at the injection energy 2.5 GeV. Orbit distortions do not exceed 2 cm inside the insertion. The influences of the snake fields' nonlinearities on the beam dynamics are discussed.

Published
2004

43. Electron-ion collisions at RHIC using a high intensity self-polarizing electron ring

Author

Yu. M. Shatunov, Vadim Ptitsyn, Brett Parker, Ivan Koop, J.B. van der Laan, Steve Peggs, J. Kewisch, Dmitry Berkaev, C. Tschalaer, D. Barber, Dejan Trbojevic, F. Wang, and A. V. Otboev

Subjects
Nuclear physics, Physics, Lattice (order), Magnet, Cathode ray, Physics::Accelerator Physics, Synchrotron radiation, Electron, Atomic physics, Nuclear Experiment, Beam (structure), Linear particle accelerator, Ion
Abstract

We consider the design of an electron-ion collider realized by adding a self-polarizing electron ring to the existing RHIC collider. It would provide polarized electron-proton and unpolarized electron-ion beam collisions in the center of mass energy range of 30-100 GeV and at luminosities up to 10/sup 33/ cm/sup -2/s/sup -1/ for e-p and 10/sup 31/ cm/sup -2/s/sup -1/ for e-Au collisions. An electron storage ring lattice has been developed which provides a short polarization time for an electron beam in the 5-10 GeV energy range and which satisfies the luminosity goals. We describe the modifications to the RHIC interaction region layout required for both efficient beam separation and also for longitudinal electron and proton beam polarization at the collision point.

Published
2004

44. Status of the e-Ring Design for EIC

Author

F. Wang, D. Barber, Ross Milner, C. Tschalaer, Yu. M. Shatunov, Dmitry Berkaev, A. V. Otboev, Vadim Ptitsyn, and Brett Parker

Subjects
Physics, Particle properties, Optics, business.industry, Magnet, Electron optics, Electrical engineering, Electron, Polarization (waves), business, Lepton
Abstract

The layout and main parameters of the e‐ring for EIC project are presented. Optics properties to fulfil so‐called spin‐transparency conditions to obtain sufficient polarization degree at IP are given. The possibility of using super‐bend magnets for polarization time in a wide energy range to decrease is also discussed.

Published
2003

45. Concept for a polarized electron-proton collider with 15-30 GeV c.m. energy and 10/sup 33/ cm/sup -2/ s/sup -1/ luminosity

Author

Igor Nesterenko, F. Wang, A. V. Otboev, A.N. Skrinsky, M. S. Korostelev, Yu. M. Shatunov, K. D. Jacobs, G. T. Zwart, R. G. Milner, Vladimir Reva, Ivan Koop, C. Tschalaer, Dmitry Shatilov, Vasilii V. Parkhomchuk, Evgeny Perevedentsev, A. Zolfaghari, P. Yu. Shatunov, and V.G. Shamovsky

Subjects
Physics, Nuclear physics, Particle physics, Proton, Physics::Accelerator Physics, High Energy Physics::Experiment, Electron, Nuclear Experiment, Polarization (waves), Storage ring
Abstract

This report presents preliminary results of the feasibility study for a polarized electron-proton beam collider with a center of mass energy range of 15-30 GeV.

Published
2002

46. Study of theππmass spectra in the processe+e−→π+π−π0ats≃1020MeV

Author

V. B. Golubev, Yu. M. Shatunov, M. S. Korostelev, A. V. Bozhenok, Sergey Burdin, Evgeny Perevedentsev, A. V. Vasiljev, V. M. Aulchenko, V. P. Druzhinin, Alexander Bogdanchikov, Yu. S. Velikzhanin, V. N. Ivanchenko, Z. K. Silagadze, A. V. Berdyugin, M. N. Achasov, Vladimir A. Sidorov, T. V. Dimova, Konstantin Beloborodov, D.A. Bukin, S. I. Serednyakov, V. V. Shary, A. D. Bukin, A. A. Salnikov, E. V. Pakhtusova, P.M. Ivanov, S. V. Koshuba, A. A. Korol, and A. V. Otboev

Subjects
Physics, Nuclear and High Energy Physics, Particle decay, Meson, Branching fraction, Electron–positron annihilation, Hadron, Elementary particle, Atomic physics, Omega, Energy (signal processing)
Abstract

The invariant mass spectra of the ${\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ and ${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\pi}}^{0}$ pairs in the process ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$ were studied in the Spherical Neutral Detector experiment at the VEPP-2M collider in the energy region $\sqrt{s}\ensuremath{\simeq}1020$ MeV. These studies were based on about $0.5\ifmmode\times\else\texttimes\fi{}{10}^{6}$ events. The spectra were analyzed in the framework of the vector meson dominance model. It was found that the experimental data can be described assuming the ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\rho}\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\pi}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$ transition only. An upper limit on the branching ratio of the $\ensuremath{\varphi}(1020)\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$ decay through intermediate states different from $\ensuremath{\rho}\ensuremath{\pi}$ was obtained at the $90%$ confidence level: $B(\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\varphi}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0})l6\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}.$ The \ensuremath{\rho}-meson mass and width which follow from the spectra analysis are ${m}_{\ensuremath{\rho}}=775.0\ifmmode\pm\else\textpm\fi{}1.3$ MeV, ${\ensuremath{\Gamma}}_{\ensuremath{\rho}}=150.4\ifmmode\pm\else\textpm\fi{}3.0$ MeV. The mass difference of the neutral and charged $\ensuremath{\rho}$ mesons was found to equal ${m}_{{\ensuremath{\rho}}^{\ifmmode\pm\else\textpm\fi{}}}\ensuremath{-}{m}_{{\ensuremath{\rho}}^{0}}=\ensuremath{-}1.3\ifmmode\pm\else\textpm\fi{}2.3$ MeV. In the ${\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ mass spectrum the $\ensuremath{\rho}\ensuremath{-}\ensuremath{\omega}$ interference was seen at a two standard deviation level.

Published
2002

47. Study of the process e+e− → ηγ → 7γ in the energy region s < 1.4 GeV

Author

V. B. Golubev, Ivan Koop, A. V. Bozhenok, V. V. Shary, Evgeny Perevedentsev, A. A. Korol, A. V. Vasiljev, Alexander Bogdanchikov, V. P. Druzhinin, S. I. Serednyakov, Vladimir A. Sidorov, A. D. Bukin, A. G. Skripkin, E. V. Pakhtusova, Sergey Burdin, S.E. Baru, P.M. Ivanov, Z. K. Silagadze, Konstantin Beloborodov, M. S. Korostelev, Yu. M. Shatunov, V. N. Ivanchenko, D.A. Bukin, A. A. Drozdetski, A. V. Berdyugin, A. A. Salnikov, A. V. Otboev, M. N. Achasov, S. V. Koshuba, and T. V. Dimova

Subjects
Physics, Nuclear physics, Particle physics, Particle decay, Meson, Hadron, Resonance, Elementary particle, Quarkonium, Particle identification, Boson
Abstract

We present results of studies e+e− → ηγ cross section in the energy region s

Published
2002

48. Precise measurement hadronic cross sections with CMD-2 detector at VEPP-2M

Author

S. Eidelman, L.M. Kurdadze, P.Yu. Stepanov, Alexander Valishev, Sergei V. Karpov, Yu. M. Shatunov, D.N. Grigoriev, V. M. Aulchenko, V. W. Hughes, A.S. Kuzmin, Igor Nesterenko, A.I. Sukhanov, A.A. Polunin, N.S. Bashtovoy, Ivan Koop, N.I. Root, E. P. Solodov, A.A. Grebeniuk, B. Shwartz, A.G. Shamov, A.S. Popov, R.R. Akhmetshin, A.N. Skrinsky, A.A. Ruban, K.Yu. Mikhailov, I. G. Snopkov, A. V. Otboev, A.L. Sibidanov, Vassili Kazanin, P. Krokovny, M. S. Korostelev, N.M. Ryskulov, A. P. Lysenko, A.E. Bondar, S.E. Baru, G.V. Fedotovitch, P.M. Ivanov, J. A. Thompson, A.V. Bragin, A.I. Shekhtman, V.S. Okhapkin, D.V. Chernyak, I.B. Logashenko, Evgeny Perevedentsev, S.G. Zverev, Yu.V. Yudin, V.Sh. Banzarov, P.A. Lukin, V.M. Titov, T.A. Purlatz, N. Gabyshev, B. I. Khazin, D.V. Bondarev, Vladimir Smakhtin, E.V. Anashkin, Vladimir A. Sidorov, and L. M. Barkov

Subjects
Physics, Nuclear physics, Particle decay, Particle physics, Rho meson, Luminosity (scattering theory), Pion, Annihilation, Meson, High Energy Physics::Experiment, Nuclear Experiment, Quarkonium, Particle identification
Abstract

The Cryogenic Magnetic Detector (CMD‐2) and main it’s parameters are shortly described. The results for the cross sections of e+e− annihilation into hadrons are presented in the c.m. energy range from 0.37 to 1.39 GeV. The total integrated luminosity of about 31 pb−1 has been collected. The new results for the ρ and ω meson parameters were obtained. The pion form factor was determinated with a 0.6% systematic uncertainty. The major decay modes of the φ meson as well as multihadron final states have been studied in a broad energy range.

Published
2002

49. Conceptual design study of the electron-proton storage ring collider with polarized beams

Author

Ross Milner, Evgeny Perevedentsev, Igor Nesterenko, C. Tschalaer, Yu. M. Shatunov, A.N. Skrinsky, Ivan Koop, D. N. Satilov, M. S. Lorestelev, P. Yu. Shatunov, V. G. Sahmovsky, A. V. Otboev, V. V. Parkhomchuk, and Vladimir Reva

Subjects
Physics, Particle physics, Range (particle radiation), Proton, Nuclear Theory, Electron, Linear particle accelerator, law.invention, Nuclear physics, Conceptual design, law, Physics::Accelerator Physics, High Energy Physics::Experiment, Nuclear Experiment, Collider, Storage ring
Abstract

This report presents a preliminary feasibility study of the electron-proton collider with polarized electron and proton beams with c.m. energy in the range of 15 to 30 GeV.

Published
2001

50. First experience with SND calorimeter at VEPP-2000 collider

Author

A. A. Korol, P. Yu. Shatunov, D.A. Bukin, Yu. M. Shatunov, A. V. Otboev, M. N. Achasov, Evgeny Perevedentsev, A.L. Romanov, I. A. Koop, S.V. Koshuba, A.A. Valkovich, D. P. Kovrizhin, Alexander Bogdanchikov, Dmitry Berkaev, D.B. Shwartz, Yu. A. Rogovsky, and Ilya Zemlyansky

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Luminosity (scattering theory), Calorimeter (particle physics), Physics::Instrumentation and Detectors, Detector, law.invention, Nuclear physics, law, Physics::Accelerator Physics, High Energy Physics::Experiment, Collider, Instrumentation, VEPP-2000, Beam (structure)
Abstract

The luminosity measurement of the new VEPP-2000 collider based on the Round Colliding Beam concept using SND detector calorimeter is described.

Published
2009

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