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82 results on '"E.A. Perevedentsev"'

1. 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
Physics, QC1-999
Abstract

The cross section of the process e+e−→KS0KS0π+π− has been measured using a data sample of 56.7 pb−1 collected with the CMD-3 detector at the VEPP-2000 e+e− collider. 596±27 and 210±18 signal events have been selected with six and five detected tracks, respectively, in the center-of-mass energy range 1.6–2.0 GeV. The total systematic uncertainty of the cross section is about 10%. The study of the production dynamics confirms the dominance of the K⁎(892)+K⁎(892)− intermediate state.

Published
2020
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2. Search for direct production of the f1(1285) resonance in e+e− collisions

Author

M.N. Achasov, A.Yu. Barnyakov, K.I. Beloborodov, A.V. Berdyugin, D.E. Berkaev, A.G. Bogdanchikov, A.A. Botov, T.V. Dimova, V.P. Druzhinin, V.B. Golubev, L.V. Kardapoltsev, A.S. Kasaev, A.G. Kharlamov, I.A. Koop, A.A. Korol, D.P. Kovrizhin, S.V. Koshuba, A.S. Kupich, R.A. Litvinov, A.P. Lysenko, K.A. Martin, N.A. Melnikova, N.Yu. Muchnoi, A.E. Obrazovsky, E.V. Pakhtusova, E.A. Perevedentsev, K.V. Pugachev, S.I. Serednyakov, Z.K. Silagadze, P.Yu. Shatunov, Yu.M. Shatunov, D.A. Shtol, D.B. Shwartz, I.K. Surin, Yu.V. Usov, I.M. Zemlyansky, V.N. Zhabin, and V.V. Zhulanov

Subjects
Physics, QC1-999
Abstract

A search for direct production of the f1(1285) resonance in e+e− annihilation is performed with the SND detector at the VEPP-2000 e+e− collider. The analysis is based on data with an integrated luminosity of 15.1 pb−1 accumulated in the center-of-mass energy range 1.2–1.4 GeV. Two e+e−→f1(1285) candidate events are found at the peak of the resonance and zero events beyond the resonance. The significance of the e+e−→f1(1285) signal is 2.5σ. The cross section at the maximum of the resonance is found to be σ(e+e−→f1)=45−24+33 pb. The corresponding branching fraction B(f1(1285)→e+e−)=(5.1−2.7+3.7)×10−9. We consider this result as a first indication of the process e+e−→f1(1285). The measured branching fraction is consistent with the theoretical prediction.

Published
2020
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3. Study of the process e+e− → K+K−η with the CMD-3 detector at the VEPP-2000 collider

Author

V.L. Ivanov, G.V. Fedotovich, 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, S.E. Gayazov, A.A. Grebenuk, S.S. Gribanov, D.N. Grigoriev, F.V. Ignatov, 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, S.S. Tolmachev, A.I. Vorobiov, and Yu.V. Yudin

Subjects
Physics, QC1-999
Abstract

The process e+e−→K+K−η has been studied in the center-of-mass energy range from 1.59 to 2.007 GeV using the data sample of 59.5 pb−1, collected with the CMD-3 detector at the VEPP-2000 e+e− collider in 2011, 2012 and 2017. The K+K−η final state is found to be dominated by the contribution of the ϕ(1020)η intermediate state. The cross section of the process e+e−→ϕ(1020)η has been measured with a systematic uncertainty of 5.1% on the base of 3009 ± 67 selected events. The obtained cross section has been used to calculate the contribution to the anomalous magnetic moment of the muon: aμϕη(E

Published
2019
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4. Study of the process e+e−→K+K− in the center-of-mass energy range 1010–1060 MeV with the CMD-3 detector

Author

E.A. Kozyrev, E.P. Solodov, R.R. Akhmetshin, A.N. Amirkhanov, A.V. Anisenkov, V.M. Aulchenko, V.S. 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, A.S. Kasaev, V.F. Kazanin, A.A. Korobov, I.A. Koop, A.N. 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, Yu.A. Rogovsky, A.A. Ruban, N.M. Ryskulov, A.E. Ryzhenenkov, V.E. Shebalin, D.N. Shemyakin, B.A. Shwartz, D.B. Shwartz, A.L. Sibidanov, Yu.M. Shatunov, A.A. Talyshev, A.I. Vorobiov, and Yu.V. Yudin

Subjects
Physics, QC1-999
Abstract

The process e+e−→K+K− has been studied using 1.7×106 events from a data sample corresponding to an integrated luminosity of 5.7 pb−1 collected with the CMD-3 detector in the center-of-mass energy range 1010–1060 MeV. The cross section is measured with about 2% systematic uncertainty and is used to calculate the contribution to the anomalous magnetic moment of the muon aμK+K−=(19.33±0.40)×10−10, and to obtain the ϕ(1020) meson parameters. We consider the relationship between the e+e−→K+K− and e+e−→KS0KL0 cross sections and compare it to the theoretical prediction.

Published
2018
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5. Study of the process e+e−→π+π−π+π− in the c.m. energy range 920–1060 MeV 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, A.S. Kasaev, V.F. Kazanin, I.A. Koop, O.A. Kovalenko, A.A. Korobov, A.N. Kozyrev, E.A. Kozyrev, P.P. Krokovny, A.E. Kuzmenko, A.S. Kuzmin, I.B. Logashenko, A.P. Lysenko, P.A. Lukin, K.Yu. Mikhailov, V.S. Okhapkin, Yu.N. Pestov, E.A. Perevedentsev, A.S. Popov, G.P. Razuvaev, Yu.A. Rogovsky, A.A. Ruban, N.M. Ryskulov, A.E. Ryzhenenkov, V.E. Shebalin, D.N. Shemyakin, B.A. Shwartz, D.B. Shwartz, A.L. Sibidanov, Yu.M. Shatunov, E.P. Solodov, V.M. Titov, A.A. Talyshev, A.I. Vorobiov, and Yu.V. Yudin

Subjects
Physics, QC1-999
Abstract

A cross section of the process e+e−→π+π−π+π− has been measured using 6798±93 signal events from a data sample corresponding to an integrated luminosity of 9.8 pb−1 collected with the CMD-3 detector in the center-of-mass energy range 920–1060 MeV. The measured cross section exhibits a pattern of interference of the ϕ(1020)→π+π−π+π− decay with a non-resonant process e+e−→π+π−π+π−, from which we obtain the branching fraction of the doubly suppressed decays (by G-parity and OZI rule): B(ϕ→π+π−π+π−)=(6.5±2.7±1.6)×10−6.

Published
2017
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6. Measurement of the e+e−→K+K−π+π− cross section with the CMD-3 detector at the VEPP-2000 collider

Author

D.N. Shemyakin, G.V. Fedotovich, R.R. Akhmetshin, A.N. Amirkhanov, A.V. Anisenkov, V.M. Aulchenko, V.Sh. Banzarov, N.S. Bashtovoy, A.E. Bondar, A.V. Bragin, S.I. Eidelman, D.A. Epifanov, L.B. Epshteyn, A.L. Erofeev, 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.A. Korobov, O.A. Kovalenko, A.N. Kozyrev, E.A. Kozyrev, P.P. Krokovny, A.E. Kuzmenko, A.S. Kuzmin, I.B. Logashenko, A.P. Lysenko, P.A. Lukin, K.Yu. Mikhailov, V.S. Okhapkin, Yu.N. Pestov, E.A. Perevedentsev, A.S. Popov, G.P. Razuvaev, Yu.A. Rogovsky, A.A. Ruban, N.M. Ryskulov, A.E. Ryzhenenkov, V.E. Shebalin, B.A. Shwartz, D.B. Shwartz, A.L. Sibidanov, Yu.M. Shatunov, E.P. Solodov, V.M. Titov, A.A. Talyshev, A.I. Vorobiov, Yu.V. Yudin, and I.M. Zemlyansky

Subjects
Physics, QC1-999
Abstract

The process e+e−→K+K−π+π− has been studied in the center-of-mass energy range from 1500 to 2000 MeV using a data sample of 23 pb−1 collected with the CMD-3 detector at the VEPP-2000 e+e− collider. Using about 24 000 selected events, the e+e−→K+K−π+π− cross section has been measured with a systematic uncertainty decreasing from 11.7% at 1500–1600 MeV to 6.1% above 1800 MeV. A preliminary study of K+K−π+π− production dynamics has been performed.

Published
2016
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7. Search for the process e+e−→η′(958) with the CMD-3 detector

Author

R.R. Akhmetshin, 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, D.N. Grigoriev, E.N. Gromov, F.V. Ignatov, S.V. Karpov, V.F. Kazanin, B.I. Khazin, I.A. Koop, 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, N.Yu. Muchnoi, V.S. Okhapkin, Yu.N. Pestov, E.A. Perevedentsev, A.S. Popov, G.P. Razuvaev, Yu.A. Rogovsky, A.L. Romanov, A.A. Ruban, N.M. Ryskulov, A.E. Ryzhenenkov, V.E. Shebalin, D.N. Shemyakin, B.A. Shwartz, D.B. Shwartz, A.L. Sibidanov, P.Yu. Shatunov, Yu.M. Shatunov, E.P. Solodov, V.M. Titov, A.A. Talyshev, A.I. Vorobiov, and Yu.V. Yudin

Subjects
Physics, QC1-999
Abstract

A search for the process e+e−→η′(958) in the π+π−η→π+π−γγ 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 Ec.m.=957.68 MeV we set an upper limit for the product of electronic width and branching fractions Γη′(958)→e+e−⋅Bη′(958)→π+π−η⋅Bη→γγ

Published
2015
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8. Status of Vepp-2000 BINP Electron–Positron Collider

Author

E.A. Perevedentsev, Maxim Timoshenko, Yu. M. Shatunov, A. P. Lysenko, A.S. Kasaev, Yu. M. Zharinov, Oleg Meshkov, P. Yu. Shatunov, G. V. Karpov, Ilya Zemlyansky, Yu. A. Rogovsky, Dmitry Shatilov, V. M. Borin, Vasiliy Prosvetov, D. B. Schwartz, A. N. Kirpotin, A. I. Senchenko, and I. A. Koop

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Radiation, Luminosity (scattering theory), Record value, Physics::Instrumentation and Detectors, Electron, Atomic and Molecular Physics, and Optics, law.invention, Nuclear physics, Positron, law, Physics::Accelerator Physics, High Energy Physics::Experiment, Radiology, Nuclear Medicine and imaging, Collider, VEPP-2000, Beam (structure)
Abstract

VEPP-2000 is the only electron–positron collider with round beams. This factor enables one to increase the beam–beam effect limit. During the 2018–2019 season, the experimental program was focused on the energy range of 550–990 MeV per beam. Data accumulation was performed using CMD-3 and SND detectors. The measured luminosity integral proved to have a record value of 68 pb–1 per detector. After connecting to the BINP injection complex in 2016, the luminosity of VEPP-2000 is limited by the beam–beam effects in the entire energy range.

Published
2020

9. Measurement of the e+e− → π+π− process cross section with the SND detector at the VEPP-2000 collider in the energy region 0.525 < $$ \sqrt{s} $$ < 0.883 GeV

Author

A. Yu. Barnyakov, E. V. Pakhtusova, K. A. Martin, N. Yu. Muchnoi, N. A. Melnikova, P. Yu. Shatunov, A. E. Obrazovsky, Aleksandr Korol, V. B. Golubev, D. A. Shtol, Yu. M. Shatunov, A. V. Berdyugin, A. A. Baykov, Yu. V. Usov, Alexander Bogdanchikov, A. P. Lysenko, D. B. Shwartz, A. A. Botov, A.S. Kupich, I. M. Zemlyansky, L. V. Kardapoltsev, E.A. Perevedentsev, M. N. Achasov, D.E. Berkaev, Alexey Kharlamov, Y. S. Savchenko, T. V. Dimova, Z. K. Silagadze, I. A. Koop, V. N. Zhabin, I. K. Surin, D. P. Kovrizhin, K. V. Pugachev, V. P. Druzhinin, Konstantin Beloborodov, and S. I. Serednyakov

Subjects
Systematic error, Physics, Nuclear and High Energy Physics, Luminosity (scattering theory), Meson, Detector, e +-e − Experiments, High Energy Physics - Experiment, law.invention, Cross section (geometry), Nuclear physics, law, lcsh:QC770-798, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, Collider, VEPP-2000, Energy (signal processing)
Abstract

The cross section of the process e+e− → π+π− has been measured in the Spherical Neutral Detector (SND) experiment at the VEPP-2000 e+e− collider VEPP-2000 in the energy region 525 <$$ \sqrt{s} $$ s < 883 MeV. The measurement is based on data with an integrated luminosity of about 4.6 pb−1. The systematic uncertainty of the cross section determination is 0.8% at $$ \sqrt{s} $$ s > 0.600 GeV. The ρ meson parameters are obtained as mρ = 775.3 ± 0.5 ± 0.6 MeV, Γρ = 145.6 ± 0.6 ± 0.8 MeV, Bρ→e+e− × Bρ→π+π− = (4.89 ± 0.02 ± 0.04) × 10−5, and the parameters of the e+e− → ω → π+π− process, suppressed by G-parity, as Bω→e+e− × Bω→π+π− = (1.32 ± 0.06 ± 0.02) × 10−6 and and ϕρω = 110.7 ± 1.5 ± 1.0 degrees.

Published
2021

10. Measurement of the $$e^+e^- \rightarrow K^+ K^- \pi ^0$$ cross section with the SND detector

Author

V. B. Golubev, Yu. M. Shatunov, L. V. Kardapoltsev, M. N. Achasov, M.Yu. Barnyakov, D. A. Shtol, N. A. Melnikova, D. B. Shwartz, S. I. Serednyakov, A. A. Botov, E. V. Pakhtusova, V. N. Zhabin, V. V. Zhulanov, E. A. Kravchenko, N. Yu. Muchnoy, I. K. Surin, Z. K. Silagadze, A. P. Onuchin, Aleksandr Korol, A. A. Baykov, E.A. Perevedentsev, A. P. Lysenko, A. E. Obrazovsky, T. V. Dimova, K. V. Pugachev, Y. S. Savchenko, A.Yu. Barnyakov, Alexey Kharlamov, V. P. Druzhinin, Yu. V. Usov, Yu. A. Tikhonov, I. M. Zemlyansky, Konstantin Beloborodov, D.E. Berkaev, P. Yu. Shatunov, K. A. Martin, A. S. Kupich, A. V. Berdyugin, Alexander Bogdanchikov, D. P. Kovrizhin, and A. R. Buzykaev

Subjects
010302 applied physics, Physics, Particle physics, Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, BaBar experiment, 01 natural sciences, law.invention, Luminosity, Amplitude, law, 0103 physical sciences, Pi, Mass spectrum, Intermediate state, Collider, Engineering (miscellaneous), Energy (signal processing)
Abstract

The process $$e^+e^-\rightarrow K^+K^-\pi ^0$$ e + e - → K + K - π 0 is studied with the SND detector at the VEPP-2000 $$e^+e^-$$ e + e - collider. Basing on data with an integrated luminosity of 26.4 $$\hbox {pb}^{-1}$$ pb - 1 we measure the $$e^+e^-\rightarrow K^+K^-\pi ^0$$ e + e - → K + K - π 0 cross section in the center-of-mass energy range from 1.28 up to 2 GeV. The measured mass spectrum of the $$K\pi $$ K π system indicates that the dominant mechanism of this reaction is the transition through the $$K^{*}(892)K$$ K ∗ ( 892 ) K intermediate state. The cross section for the $$\phi \pi ^0$$ ϕ π 0 intermediate state is measured separately. The SND results are consistent with previous measurements in the BABAR experiment and have comparable accuracy. We study the effect of the interference between the $$\phi \pi ^0$$ ϕ π 0 and $$K^*K$$ K ∗ K amplitudes. It is found that the interference gives sizable contribution to the measured $$e^+e^- \rightarrow \phi \pi ^0\rightarrow K^+K^-\pi ^0$$ e + e - → ϕ π 0 → K + K - π 0 cross section below 1.7 GeV.

Published
2020

11. 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

12. Measurement of the e+e− → ηK+K− Cross Section by Means of the SND Detector

Author

Alexey Kharlamov, D. P. Kovrizhin, A. V. Surin, Yu. M. Shatunov, T. V. Dimova, A.V. Vasiljev, E. V. Pakhtusova, P. Yu. Shatunov, A.N. Skrinsky, Konstantin Beloborodov, A. P. Lysenko, Yu. A. Tikhonov, D. A. Shtol, S. I. Serednyakov, Y. Usov, Alexey Buzykaev, Aleksandr Korol, A.Yu. Barnyakov, A. P. Onuchin, Ilya Zemlyansky, A. E. Obrazovsky, V. P. Druzhinin, E.A. Perevedentsev, S.V. Koshuba, Z. K. Silagadze, V. B. Golubev, N. A. Melnikova, A. A. Botov, E. A. Kravchenko, Alexander Bogdanchikov, K. V. Pugachev, L. V. Kardapoltsev, M. N. Achasov, A. V. Berdyugin, K. A. Martin, A. S. Kupich, and M.Yu. Barnyakov

Subjects
Physics, Nuclear and High Energy Physics, Meson, Mass distribution, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Hadron, Detector, Elementary particle, 01 natural sciences, Atomic and Molecular Physics, and Optics, law.invention, Nuclear physics, law, 0103 physical sciences, Intermediate state, High Energy Physics::Experiment, 010306 general physics, Collider, Boson
Abstract

The cross section for the process e+e− → ηK+K− wasmeasured at c.m. energies in the range between 1.56 and 2.00 GeV in an experiment with the SND detector at the VEPP-2000 e+e− collider. The invariant-mass distribution of kaon pairs is consistent with the hypothesis that the transition through the ηφ intermediate state makes a dominant contribution to the transition in question.

Published
2018

13. Cross sections of hadronic reactions e + e − → K + K − nπ (n =1,2,3) measured with the CMD3 detector at the VEPP-2000 electron–positron collider

Author

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

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

We analyze the data on e + e − collisions at c.m.s. energies between 0.32 and 2 GeV collected in 2011–2013 with the CMD3 detector operating at the VEPP-3 e + e − collider of the Budker Institute of Nuclear Physics. The data correspond to an integrated luminosity of nearly 60 pb-1. Preliminary results e + e − → K + K − nπ (n = 1, 2, 3) on the reactions with two charged kaons in the final state are presented, and the procedure for estimating the integrated luminosity for each energy setting is described.

Published
2017

14. 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

15. Search for direct production of the $f_1(1285)$ resonance in $e^+e^-$ collisions

Author

T. V. Dimova, K. V. Pugachev, L. V. Kardapoltsev, S. I. Serednyakov, Alexey Kharlamov, A. E. Obrazovsky, A.Yu. Barnyakov, V. B. Golubev, M. N. Achasov, I. A. Koop, Y. Usov, V. P. Druzhinin, E. V. Pakhtusova, A.S. Kasaev, V. V. Zhulanov, P. Yu. Shatunov, N. A. Melnikova, I. K. Surin, A. P. Lysenko, R. A. Litvinov, I. M. Zemlyansky, D. P. Kovrizhin, Z. K. Silagadze, D.E. Berkaev, V. N. Zhabin, Konstantin Beloborodov, E.A. Perevedentsev, A. V. Berdyugin, Yu. M. Shatunov, A.S. Kupich, Dmitry Shtol, A. A. Botov, Alexander Bogdanchikov, K. A. Martin, N. Yu. Muchnoi, Aleksandr Korol, D. B. Shwartz, and S.V. Koshuba

Subjects
Physics, Nuclear and High Energy Physics, Annihilation, 010308 nuclear & particles physics, Branching fraction, Analytical chemistry, Zero (complex analysis), FOS: Physical sciences, Resonance, 01 natural sciences, lcsh:QC1-999, Luminosity, law.invention, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Direct production, law, 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics, Collider, lcsh:Physics
Abstract

A search for direct production of the $f_1(1285)$ resonance in $e^+e^-$ annihilation is performed with the SND detector at the VEPP-2000 $e^+e^-$ collider. The analysis is based on data with an integrated luminosity of 15.1 pb$^{-1}$ accumulated in the center-of-mass energy range 1.2--1.4 GeV. Two $e^+e^-\to f_1(1285)$ candidate events are found at the peak of the resonance and zero events beyond the resonance. The significance of the $e^+e^-\to f_1(1285)$ signal is $2.5\sigma$. The cross section at the maximum of the resonance is found to be $\sigma(e^+e^-\to f_1)=45^{+33}_{-24}$ pb. The corresponding branching fraction $B(f_1(1285)\to e^+e^-)=(5.1^{+3.7}_{-2.7})\times 10^{-9}$. We consider this result as a first indication of the process $e^+e^-\to f_1(1285)$. The measured branching fraction is consistent with the theoretical prediction., Comment: 11 pages, 4 figures

Published
2019

16. Study of the processes e+e-→ K+K− + nπ (n = 1,2,3) with the CMD-3 detector at the VEPP-2000 electron-positron collider

Author

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

Subjects
Physics, Luminosity (scattering theory), 010308 nuclear & particles physics, QC1-999, Detector, Electron, 01 natural sciences, law.invention, Nuclear physics, Positron, law, 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics, Collider, VEPP-2000, Energy (signal processing)
Abstract

The data sample collected in 2011-2013 at the c.m.s. energies between 0.32-2 GeV with the CMD-3 detector operating at the VEPP-2000 e+e− collider is analzed. The collected data corresponds to an integrated luminosity about ∼ 60pb−1. The techniques for determination of the integrated luminosity for each energy setting is described. Some preliminary results of the study of the processes e+e−→ K+ K− + nπ (n = 1,2,3) with two charged kaons in the final state are presented. These processes have several intermediate states, which are important to correctly descript the angular distributions of final particles and the cross sections dependence on the energy.

Published
2019

17. 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

18. BINP electron-positron facilities

Author

Dmitry Berkaev, Vasiliy Prosvetov, D. Bolkhovitianov, N. Lebedev, V. Balakin, Pavel Piminov, V. Muslivets, Ilya Zemlyansky, Kseniya Astrelina, A. P. Lysenko, Yu. M. Shatunov, Anatoly Murasev, Oleg Meshkov, O. V. Belikov, A. V. Otboyev, P. Martishkin, Yu. A. Rogovsky, Evgeny Levichev, A. I. Senchenko, Sergey Motygin, E.A. Perevedentsev, Anatoliy Frolov, F. A. Emanov, A.S. Kasaev, A. M. Semenov, I. A. Koop, Sergey Vasiliev, A.M. Batrakov, P. Shatunov, A. N. Zhuravlev, Yu. M. Zharinov, A.A. Krasnov, Yu. I. Maltseva, A. N. Kirpotin, D. B. Shwartz, Maxim Timoshenko, and K. M. Gorchakov

Subjects
Nuclear physics, Physics, Positron, 010308 nuclear & particles physics, Physics::Instrumentation and Detectors, QC1-999, 0103 physical sciences, Physics::Accelerator Physics, High Energy Physics::Experiment, Electron, 010306 general physics, 01 natural sciences
Abstract

The present status of two operating BINP electron-positron colliders VEPP-2000 and VEPP-4M is given.

Published
2019

19. 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

20. Preliminary results of the cross-section measurement of e+e− → φ(1020)η process with the CMD-3 detector at VEPP-2000 collider

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), Luminosity (scattering theory), 010308 nuclear & particles physics, Electron–positron annihilation, Detector, 01 natural sciences, Atomic and Molecular Physics, and Optics, law.invention, Nuclear physics, Cross section (physics), law, 0103 physical sciences, 010306 general physics, Collider, VEPP-2000, Energy (signal processing)
Abstract

We report preliminary results on the cross section of the process e+e− → φ(1020)η measured at 30 center-of-mass energy points in the range from 1.59 up to 2.0 GeV. Data analysis is based on the integrated luminosity of 22 pb−1 collected with the CMD-3 detector in 2011–2012. The obtained cross section agrees with the BaBar measurement and has better statistical accuracy.

Published
2016

21. Measurement of the e + e − → π+π−π0 cross section with the CMD-3 detector

Author

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

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Cross section (physics), Range (particle radiation), 010308 nuclear & particles physics, Electron–positron annihilation, 0103 physical sciences, Detector, Atomic physics, 010306 general physics, 01 natural sciences, Energy (signal processing)
Abstract

The preliminary results of measurement of the e + e − → π+π−π0 cross section in the 1.05–2 GeV center-of-mass energy range with 30 pb–1 of experimental data collected using the CMD-3 detector are presented. The parameters of resonant states ω(1420) and ω(1650) are obtained.

Published
2017

22. Study of the process e + e − → K + K − in the center-of-mass energy range 1010–1060 MeV with the CMD-3 detector

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Muon, Anomalous magnetic dipole moment, Meson, 010308 nuclear & particles physics, Detector, Analytical chemistry, FOS: Physical sciences, 01 natural sciences, lcsh:QC1-999, Luminosity, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, Center of mass, 010306 general physics, Energy (signal processing), lcsh:Physics
Abstract

The process e + e − → K + K − has been studied using 1.7 × 10 6 events from a data sample corresponding to an integrated luminosity of 5.7 pb −1 collected with the CMD-3 detector in the center-of-mass energy range 1010–1060 MeV. The cross section is measured with about 2% systematic uncertainty and is used to calculate the contribution to the anomalous magnetic moment of the muon a μ K + K − = ( 19.33 ± 0.40 ) × 10 − 10 , and to obtain the ϕ ( 1020 ) meson parameters. We consider the relationship between the e + e − → K + K − and e + e − → K S 0 K L 0 cross sections and compare it to the theoretical prediction.

Published
2018

23. Measurement of the hadronic cross sections with the CMD-3 and SND detectors at the VEPP-2000 collider

Author

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

Subjects
Physics, Muon, Luminosity (scattering theory), 010308 nuclear & particles physics, Physics::Instrumentation and Detectors, QC1-999, Hadron, Detector, 01 natural sciences, law.invention, Nuclear physics, Upgrade, law, 0103 physical sciences, Physics::Accelerator Physics, High Energy Physics::Experiment, 010306 general physics, Collider, VEPP-2000, Beam energy
Abstract

Since December 2010 the CMD-3 and SND detectors detectors collect data at the VEPP-2000 electron-positron collider. In 2013-2015 the injection facility of the collider has undergone an upgrade of the injection system. The new BINP injection complex has been connected to the VEPP-2000 collider, so the restrictions connected to the lack of positrons and limited beam energy transfer do not apply any more. The collider luminosity in whole energy range is restricted now only by beam-beam effects. VEPP-2000 collider started to collect data with two detectors at 2016 year. The collected data sample since 2010 corresponds more than 100 pb-1 of integrated luminosity per detector in the c.m. energy between 0.32 and 2GeV. We will report here results of analysis of various hadronic cross sections from detectors both published and preliminary. These measurements are important by themselves and also because of the implications for anomaly of the magnetic moment of a muon (g-2) discrepancy.

Published
2018

24. 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

25. Preliminary results on CMD-3 measurement of e+e−→ π+π− cross section

Author

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

Subjects
Physics, Range (particle radiation), Luminosity (scattering theory), 010308 nuclear & particles physics, QC1-999, Detector, 01 natural sciences, law.invention, Nuclear physics, Cross section (physics), law, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, 0103 physical sciences, 010306 general physics, Collider
Abstract

The CMD-3 detector has been successfully collecting data at the electron-positron collider VEPP-2000 since December 2010. The first scan below 1 GeV for a π+π− measurement was performed in 2013. The collected data sample corresponds to about 18 pb−1 of integrated luminosity in this energy range. Analysis of the e+e−→ π+π− cross section is in progress. Status of this measurement are presented.

Published
2019

26. 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

27. Recent results from SND detector at VEPP-2000 collider

Author

K. V. Pugachev, D. P. Kovrizhin, Alexey Kharlamov, A. N. Kirpotin, A.N. Skrinsky, A.S. Kupich, D. A. Shtol, S. I. Serednyakov, Z. K. Silagadze, N. A. Melnikova, I. K. Surin, V. N. Zhabin, I. M. Zemlyansky, E. V. Pakhtusova, E.A. Perevedentsev, Dmitry Shatilov, M. N. Achasov, A. V. Berdyugin, A. A. Botov, P. Yu. Shatunov, A. E. Obrazovsky, A. P. Lysenko, R. A. Litvinov, T. V. Dimova, V. P. Druzhinin, Yu. V. Usov, V. B. Golubev, Yu. M. Shatunov, A.Yu. Barnyakov, N. Yu. Muchnoi, L. V. Kardopoltsev, Konstantin Beloborodov, Aleksandr Korol, D. B. Shwartz, S.V. Koshuba, K. A. Martin, and Alexander Bogdanchikov

Subjects
Physics, Nuclear physics, Annihilation, Luminosity (scattering theory), law, QC1-999, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Hadron, Detector, Collider, VEPP-2000, law.invention
Abstract

Recent results on e+e−annihilation to hadrons from SND experiment at VEPP-2000 collider are presented. Corresponding data set is about 200 pb−1 of integrated luminosity collected at the energy region below 2 GeV. The processes e+e− → π+π− , π0γ, ωπ0, π+π−π0, ηπ+π−π0, η, π+π−4π0 have been studied. Searches for e+e− annihilation to C-even resonances η and f1(1285) were done.

Published
2019

28. 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

29. 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

30. Overview of the CMD-3 recent results at e+e− collider VEPP-2000

Author

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

Subjects
Physics, Annihilation, Luminosity (scattering theory), 010308 nuclear & particles physics, QC1-999, Hadron, Detector, 01 natural sciences, law.invention, Nuclear physics, law, 0103 physical sciences, Invariant mass, High Energy Physics::Experiment, 010306 general physics, Collider, VEPP-2000, Energy (signal processing)
Abstract

Since December 2010, the CMD-3 detector has collected data at the electronpositron collider VEPP-2000. The sample of the accumulated data corresponds to about 60 pb −1 of integrated luminosity in the c.m. energy from 0.32 up to 2 GeV. Preliminary results of the analysis of various processes e + e − annihilation to hadrons are presented. It is shown the processes with multihadron events have several intermediate states which must be taken into account to correctly describe the angular and invariant mass distributions as well as cross section dependence versus energy.

Published
2016

31. First results from the CMD-3 Detector at the VEPP-2000 Collider

Author

N.M. Ryskulov, D.E. Berkaev, Yu.V. Yudin, S.A. Ahokhin, D.N. Grigoriev, A. P. Lysenko, Alexey Talyshev, A.V. Bragin, A.S. Popov, A.S. Kuzmin, E.A. Perevedentsev, Semen Eidelman, D.B. Shwartz, S. Pirogov, K.Yu. Mikhailov, A.E. Bondar, S.E. Gayazov, P. Yu. Shatunov, B.A. Shwartz, Yu.N. Pestov, Yu. M. Shatunov, V. S. Banzarov, A.A. Ruban, A.E. Ryzhenenkov, S.I. Redin, S.G. Pivovarov, Yu.S. Popov, I.G. Snopkov, A.S. Zaytsev, Yu. A. Rogovsky, Fedor Ignatov, L.M. Barkov, A.L. Sibidanov, Ivan Koop, B.I. Khazin, G.V. Fedotovich, E.N. Gromov, A.V. Anisyonkov, I.B. Logashenko, P.A. Lukin, V.M. Aulchenko, A.N. Kozyrev, A.I. Vorobiov, D.N. Shemyakin, S.V. Karpov, V.E. Shebalin, E. P. Solodov, A.A. Grebenuk, D. Epifanov, Vassili Kazanin, V.M. Titov, N.S. Bashtovoy, L.B. Epshteyn, and R.R. Akhmetshin

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Particle physics, Luminosity (scattering theory), Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Electron–positron annihilation, Detector, Magnetic detector, Atomic and Molecular Physics, and Optics, law.invention, Nuclear physics, law, Astrophysics::Solar and Stellar Astrophysics, High Energy Physics::Experiment, Collider, VEPP-2000, Astrophysics::Galaxy Astrophysics, Energy (signal processing)
Abstract

Regular data taking started at the VEPP-2000 e + e − collider with the CMD-3 detector. An energy scan of a center-of-mass energy range from 1 GeV to 2 GeV has been performed with an integrated luminosity of about 20 pb−1. We present first preliminary results from the CMD-3 detector.

Published
2012

32. First results on the nucleon form factors from SND

Author

Igor Nesterenko, Aleksandr Korol, T.V. Dimova, A.A. Borisov, S.V. Koshuba, A.N. Skrinsky, Yu. A. Tikhonov, Yu. M. Shatunov, D. A. Shtol, A.L. Romanov, Z. K. Silagadze, A.V. Vasilyev, A. P. Lysenko, E.A. Perevedentsev, E. V. Pakhtusova, Sergey Serednyakov, K. A. Martin, I. K. Surin, Alexey Kharlamov, K. A. Grevtsov, L. V. Kardapoltsev, A.V. Berdugin, D. P. Kovrizhin, M. N. Achasov, P. Yu. Shatunov, Yu. V. Usov, V. P. Druzhinin, Konstantin Beloborodov, I. A. Koop, D.A. Bukin, K. Yu. Skovpen, D.E. Berkaev, Alexander Bogdanchikov, Ilya Zemlyansky, A. Yu. Barnyakov, V. B. Golubev, Yu. A. Rogovsky, A. E. Obrazovsky, and A. A. Botov

Subjects
Physics, Nuclear and High Energy Physics, Antiparticle, Particle physics, Luminosity (scattering theory), Physics::Instrumentation and Detectors, Electron–positron annihilation, Hadron, Form factor (quantum field theory), Atomic and Molecular Physics, and Optics, Nuclear physics, High Energy Physics::Experiment, Nucleon, Lepton, Dimensionless quantity
Abstract

Results of the first measurements of the cross sections for the e + e − → p p ¯ and e + e − → n n ¯ with the SND detector are presented. The analysis is based on data with integrated luminosity of 2.8 pb − 1 , collected in 2011 by the SND detector at the VEPP-2000 e + e − collider in the energy range above nucleon production threshold.

Published
2012

33. Measurement of ϕ(1020) meson leptonic width with CMD-2 detector at VEPP-2M collider

Author

A. A. Grebenuk, A.E. Bondar, I.B. Logashenko, P.A. Lukin, N.M. Ryskulov, P. Krokovny, A.A. Ruban, S.I. Redin, A.S. Kuzmin, N. Gabyshev, S.I. Eidelman, D. Epifanov, D.N. Grigoriev, V.Sh. Banzarov, B.A. Shwartz, R.R. Akhmetshin, G.V. Fedotovich, A.S. Zaitsev, A. P. Lysenko, B.I. Khazin, K.Yu. Mikhailov, E.A. Perevedentsev, S.V. Karpov, A.V. Bragin, L.M. Barkov, A.L. Sibidanov, N.S. Bashtovoy, Yu. M. Shatunov, I. A. Koop, F.V. Ignatov, I.G. Snopkov, S.E. Baru, Yu.V. Yudin, E. P. Solodov, V.M. Aulchenko, A.S. Popov, Vassili Kazanin, and V.S. Okhapkin

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Meson, law, Hadron spectroscopy, Analytical chemistry, Resonance, Collider, law.invention
Abstract

The ϕ(1020) meson leptonic width has been determined from the combined analysis of 4 major decay modes of the resonance ( ϕ → K + K − , K L 0 K S 0 , π + π − π 0 , η γ ) studied with the CMD-2 detector at the VEPP-2M e + e − collider. The following value has been obtained: Γ ( ϕ → e + e − ) = 1.235 ± 0.006 ± 0.022 keV . The ϕ ( 1020 ) meson parameters in four main decay channels have been also recalculated: B ( ϕ → K + K − ) = 0.493 ± 0.003 ± 0.007 , B ( ϕ → K L K S ) = 0.336 ± 0.002 ± 0.006 , B ( ϕ → π + π − π 0 ) = 0.155 ± 0.002 ± 0.005 , B ( ϕ → η γ ) = 0.0138 ± 0.0002 ± 0.0002 .

Published
2011

34. Measurement of e+e−→ϕ→K+K− cross section with CMD-2 detector at VEPP-2M collider

Author

D. Epifanov, S.E. Baru, E.A. Perevedentsev, A.E. Bondar, I. A. Koop, Yu. M. Shatunov, A.L. Sibidanov, A.A. Grebeniuk, L.M. Barkov, I.G. Snopkov, B.I. Khazin, N.M. Ryskulov, V.S. Okhapkin, Yu.V. Yudin, D.V. Bondarev, P. Krokovny, I.B. Logashenko, B.A. Shwartz, S.V. Karpov, G.V. Fedotovich, A.S. Kuzmin, N.S. Bashtovoy, V.M. Aulchenko, A. P. Lysenko, A.S. Popov, P.A. Lukin, K.Yu. Mikhailov, N. Gabyshev, A.A. Ruban, S.I. Redin, E. P. Solodov, V.Sh. Banzarov, A.V. Bragin, R.R. Akhmetshin, Vassili Kazanin, D.N. Grigoriev, S.I. Eidelman, and F.V. Ignatov

Subjects
Physics, Nuclear and High Energy Physics, Antiparticle, Annihilation, Pair production, Meson, Antimatter, Electron–positron annihilation, Hadron, Analytical chemistry, Atomic physics, Lepton
Abstract

The process e + e − → ϕ → K + K − has been studied with the CMD-2 detector using about 542 000 events detected in the center-of-mass energy range from 1.01 to 1.034 GeV. The systematic error of the cross section is estimated to be 2.2%. The ϕ ( 1020 ) meson parameters in the ϕ → K + K − decay channel have been measured: σ 0 ( ϕ → K + K − ) = 2016 ± 8 ± 44 nb , m ϕ = 1019.441 ± 0.008 ± 0.080 MeV / c 2 , Γ ϕ = 4.24 ± 0.02 ± 0.03 MeV , B e + e − B K + K − = ( 14.27 ± 0.05 ± 0.31 ) × 10 −5 .

Published
2008

35. 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

36. Study of the ρ and ω meson decays into a pseudoscalar meson and e+e− pair with the CMD-2 detector

Author

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

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Meson, 010308 nuclear & particles physics, Branching fraction, 0103 physical sciences, Detector, Analytical chemistry, 010306 general physics, 01 natural sciences, Pseudoscalar meson, Positron annihilation
Abstract

Using 3.3 pb−1 of data collected with the CMD-2 detector in the 720–840 MeV c.m. energy range, the branching fraction of the conversion decay ω → π 0 e + e − has been measured: B ( ω → π 0 e + e − ) = ( 8.19 ± 0.71 ± 0.62 ) × 10 −4 . The upper limits for the branching fractions of the following conversion decays have been obtained at the 90% confidence level: B ( ρ → π 0 e + e − ) 1.6 × 10 −5 , B ( ρ → η e + e − ) 0.7 × 10 −5 and B ( ω → η e + e − ) 1.1 × 10 −5 .

Published
2005

37. Total cross section of the process e+e−→π+π−π+π− in the c.m. energy range 980–1380 MeV

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Antiparticle, Luminosity (scattering theory), Annihilation, Meson, 010308 nuclear & particles physics, Electron–positron annihilation, Hadron, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, Pion, 0103 physical sciences, Atomic physics, 010306 general physics, Lepton
Abstract

The e+e- -> pi+pi-pi+pi- cross section has been measured using 5.8/pb of integrated luminosity collected with the CMD-2 detector at the VEPP-2M collider. Analysis of the data with a refined efficiency determination and use of both three- and four-track events allowed doubling of a data sample and reduction of systematic errors to 5-7%., Comment: 13 pages, 5 figures, submitted to Phys. Lett. B

Published
2004

38. Study of the process e+e−→ωπ0→π0π0γ in c.m. energy range 920–1380 MeV at CMD-2

Author

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

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Antiparticle, Annihilation, Pion, Meson, Electron–positron annihilation, Hadron, Atomic physics, Omega baryon, Lepton
Abstract

The cross section of the process e + e − → ωπ 0 → π 0 π 0 γ has been measured in the c.m. energy range 920–1380 MeV with the CMD-2 detector. Its energy dependence is well described by the interference of the ρ (770) and ρ (1450) mesons decaying to ωπ 0 . Upper limits for the cross sections of the direct processes e + e − → π 0 π 0 γ , ηπ 0 γ have been set.

Published
2003

39. Analysis of e + e −→π+π−π+π− and e + e −→π+π−π0π0 processes in the energy range of $$\sqrt 2 = 0.98 - 1.38 GeV$$ in experiments with a spherical neutral detector

Author

M. N. Achasov, A. A. Valishev, E. A. Pyata, Konstantin Beloborodov, S. I. Serednyakov, Yu. M. Shatunov, E.A. Perevedentsev, Tatyana Dimova, V. B. Golubev, Vladimir Ivanchenko, D. A. Bukin, E. V. Pakhtusova, A. N. Skrinsky, A. A. Salnikov, V. P. Druzhinin, A.V. Vasiljev, Igor Nesterenko, V. V. Shary, A. V. Bozhenok, Z. K. Silagadze, Alexander Bogdanchikov, Aleksandr Korol, S. V. Koshuba, and A. V. Berdyugin

Subjects
Physics, Range (particle radiation), Solid-state physics, law, Electron–positron annihilation, General Physics and Astronomy, Intermediate state, Elementary particle, Quantum field theory, Atomic physics, Spectroscopy, Collider, law.invention
Abstract

The cross sections of the e+e−→π+π−π +π−, e+e−→π+π−π0π 0, and e+e−→ωπ→ π+π−π 0π0 processes, as well as the e+e−→π+π−π0π0 process with subtracted contribution of the ωπ intermediate state, are measured in experiments with a spherical neutral detector on the VEPP-2M collider in the energy range 0.98–1.38 GeV. About 41 000 events of the e+e−→π+π−π+π − process and more than 54 000 events of the e+e−→π+π −π0π0 process have been selected in experiment. The statistical error in determining the cross section is 2–20%, while the systematic error is 7 and 8%.

Published
2003

40. Current status of the luminosity measurement with the CMD-3 detector at the VEPP-2000 e+e− collider

Author

A.E. Bondar, B.A. Shwartz, A.S. Popov, A.E. Ryzhenenkov, A.S. Zaytsev, E.N. Gromov, D.B. Shwartz, E.A. Perevedentsev, V.M. Aulchenko, A.N. Kozyrev, I.B. Logashenko, N.M. Ryskulov, K.Yu. Mikhailov, Semen Eidelman, S.V. Karpov, P. Yu. Shatunov, Yu.S. Popov, D.E. Berkaev, S.E. Gayazov, A.S. Kuzmin, I.G. Snopkov, Yu.N. Pestov, A.L. Sibidanov, Yu. A. Rogovsky, A.A. Ruban, S.I. Redin, L.M. Barkov, A.E. Kuzmenko, B.I. Khazin, Yu. M. Shatunov, G.V. Fedotovich, A.V. Bragin, P.A. Lukin, D. Epifanov, Ivan Koop, A.V. Anisyonkov, V.E. Shebalin, L.B. Epshteyn, D.N. Shemyakin, V. S. Banzarov, Yu.V. Yudin, V.M. Titov, A.A. Grebenuk, Alexey Talyshev, Fedor Ignatov, A. P. Lysenko, S.G. Pivovarov, S. Pirogov, A.I. Vorobiov, N.S. Bashtovoy, E. P. Solodov, R.R. Akhmetshin, Vassili Kazanin, S.A. Ahokhin, and D.N. Grigoriev

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Photon, Luminosity (scattering theory), Electron–positron annihilation, Hadron, Atomic and Molecular Physics, and Optics, law.invention, Nuclear physics, law, Radiative transfer, Collider, VEPP-2000, Bhabha scattering
Abstract

The first results of the luminosity measurement with the CMD-3 detector at the VEPP-2000 e + e − collider are presented. The luminosity was measured using two different processes e + e − → e + e − and e + e − → γ γ , that allowed to better understand and estimate the systematic accuracy which was found to be ∼2%. The analysis of the data was done on the integrated luminosity about 20 pb−1. A Monte-Carlo Generator Photon Jets (MCGPJ) [A.Arbuzov et al., EPJ C46, 689 (2006); S.Actis et al., EPJ C66, 585 (2010)] to simulate Bhabha scattering events as well as production of two photons was adopted for analysis of the data. A theoretical precision of these cross sections with radiative corrections (RC) is estimated to be better than 0.2%.

Published
2012

41. Z-chamber of the CMD-3 detector in the reconstruction of the track longitudinal coordinate

Author

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

Subjects
Physics, Annihilation, Physics::Instrumentation and Detectors, Track (disk drive), Hadron, Detector, Particle detector, Computational physics, law.invention, law, Calibration, Measuring instrument, Physics::Accelerator Physics, High Energy Physics::Experiment, Collider, Instrumentation, Mathematical Physics
Abstract

Since 2010 the CMD-3 detector has been collecting data at the e+e− collider VEPP-2000 in the Budker Institute of Nuclear Physics. One of the main goals of experiments with CMD-3 detector is the precise measurement of the cross sections of the e+e− annihilation into hadrons. For a large number of processes the main source of systematic uncertainty in cross sections determination due to accuracy of polar angles determination of the tracks. Z-chamber is used for the reconstruction of the track longitudinal coordinate which is with low systematic uncertainty. The measurement of longitudinal coordinates is performed by the collecting of the charge which is induced on the strip cathodes of the Z-chamber. The algorithms of the reconstruction of cathodes clusters and calibration procedure are presented.

Published
2017

42. Current status of luminosity measurement with the CMD-3 detector

Author

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

Subjects
Physics, Measurement method, Luminosity (scattering theory), 010308 nuclear & particles physics, Detector, Astrophysics, 01 natural sciences, Particle detector, 0103 physical sciences, Measuring instrument, Current (fluid), 010306 general physics, Instrumentation, Mathematical Physics
Published
2017

43. Measurement of e+e− → π+π− cross section at CMD-3

Author

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

Subjects
Nuclear physics, Physics, Cross section (physics), Range (particle radiation), law, QC1-999, Detector, Statistical physics, Collider, law.invention
Abstract

Regular operation of the VEPP-2000 electron-positron collider started at the end of 2010 and about 60 pb −1 were collected so far by the CMD-3 detector in the whole available c.m. energy range from 0.32 GeV to 2.0 GeV. One of the main goals of the experiments at VEPP-2000 is a sub-percent measurement of the e + e − → π + π − cross-section. Here we present the overview of the data analysis techniques and the preliminary results of this measurement.

Published
2014

44. Study of the processes e+e− → K+K−π+π−, ϕη with the CMD-3 detector at the e+e− collider VEPP-2000

Author

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

Subjects
Nuclear physics, Physics, Range (particle radiation), law, QC1-999, Detector, Collider, VEPP-2000, lcsh:Physics, lcsh:QC1-999, law.invention
Abstract

We report preliminary results on the measurement of the cross sections of the processes e + e − → K + K − π + π − and e + e − → φη in the c.m.energy range from 1.5 GeV to 2 GeV with the CMD-3 detector. The cross sections of these processes agree with BaBar results and have better accuracy.

Published
2014

45. Study of the process e+e− → 2(π+π−π0) with the CMD-3 detector at VEPP-2000 collider

Author

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

Subjects
Physics, Range (particle radiation), Annihilation, Physics::Instrumentation and Detectors, QC1-999, Hadron, Detector, lcsh:QC1-999, law.invention, Nuclear physics, General purpose, law, High Energy Physics::Experiment, Collider, VEPP-2000, Energy (signal processing), lcsh:Physics
Abstract

Since 2010 the CMD-3 detector has been collecting data at the VEPP-2000 e + e − collider. CMD-3 is a general purpose detector designed to study e + e − annihilation into hadrons in the center-of-mass (c.m.) energy range from 0.3 up to 2 GeV. Preliminary results for the e + e − → 2(π + π − π 0 ) cross section were obtained in the c.m. energy range from 1.5 up to 2 GeV. The analysis is based on a data sample of 22 pb −1 .

Published
2014

46. Study of the process e+e−→ηγ in c.m. energy range 600–1380 MeV at CMD-2

Author

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

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Branching fraction, Electron–positron annihilation, Radiative transition
Abstract

The cross section of the process e + e − → ηγ has been measured in the 600–1380 MeV c.m. energy range with the CMD-2 detector. The following branching ratios have been determined: B ( ρ → ηγ )=(3.28±0.37±0.23)×10 −4 , B ( ω → ηγ )=(5.10±0.72±0.34)×10 −4 , B ( φ → ηγ )=(1.287±0.013±0.063)×10 −2 . Evidence for the ρ (1450)→ ηγ decay has been obtained for the first time.

Published
2001

47. Study of conversion decays φ→ηe+e−, η→e+e−γ and η→π+π−e+e− at CMD-2

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Meson, Electron–positron annihilation, Mass spectrum, Physical chemistry, Atomic physics
Abstract

Using 15.1 pb −1 of data collected by CMD-2 in the φ -meson energy range, the branching ratios of the following conversion decays have been measured: B ( φ → ηe + e − )=(1.14±0.10±0.06)×10 −4 , B ( η → e + e − γ )=(7.10±0.64±0.46)×10 −3 , B ( η → π + π − e + e − )=(3.7 +2.5 −1.8 ±0.3)×10 −4 . The upper limits for the following rare conversion decays have been obtained at the 90% confidence level: B ( φ → ημ + μ − ) −6 , B ( η → e + e − e + e − ) −5 .

Published
2001

48. Observation of the φ→η′γ decay with four charged particles and photons in the final state

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Photon, Branching fraction, Electron–positron annihilation, State (functional analysis), Decay chain, Atomic physics, Charged particle
Abstract

Using 11.6 pb −1 of data collected in the energy range 0.864-1.06 GeV by CMD-2 at VEPP-2M, the rare decay mode φ → η ′ γ was observed via the decay chain η ′→ π + π − η , η → π + π − π 0 or η → π + π − γ . The following branching ratio was obtained: Br(φ→η′γ)= 4.9 +2.2 −1.8 ±0.6 ×10 −5 .

Published
2000

49. Observation of the decay

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Crystallography, Annihilation, Pion, Meson, OZI rule, Branching fraction, Atomic physics
Abstract

Using 11.6 pb −1 of data collected in the energy range 0.984–1.06GeV by CMD-2 at VEPP-2M, the cross section of the reaction e + e − →π + π − π + π − hasbeen studied. For the firsttime an interference patternwas observed in the energy dependence of the cross section near theφ meson. The branching ratio of the φ → π + π − π + π − decay doublesuppressed by the G-parity and OZI rule is measuredBr(φ → π + π − π + π − ) = (3.93 ±1.74 ±2.14) ·10 −6 .The upper limits have been placed for the decays φ → π + π − π + π − π 0 and φ → ηπ + π − Br(φ → π + π − π + π − π 0 ) < 4.6 ·10 −6 90%CL,Br(φ → ηπ + π − ) < 1.8 ·10 −5 90%CL. 1 Introduction Production of four pions in e + e − annihilation is now well studied in the c.m.energy range 1.05 to 2.5 GeV (see [ 1] and references therein). Results onthe measurements of the cross section of the reaction e + e − → π + π − π + π − in the energy range from 0.60 to 0.97 GeV as well as the probability of theρ 0 meson decay into the π + π − π + π −

Published
2000

50. The process e+e−→ωπ0→π0π0γ up to 1.4 GeV

Author

M.N. Achasov, K.I. Beloborodov, A.V. Berdyugin, A.G. Bogdanchikov, A.V. Bozhenok, D.A. Bukin, S.V. Burdin, V.B. Golubev, T.V. Dimova, A.A. Drozdetsky, V.P. Druzhinin, M.S. Dubrovin, V.N. Ivanchenko, A.A. Korol, S.V. Koshuba, G.A. Kukartsev, I.N. Nesterenko, E.V. Pakhtusova, E.A. Perevedentsev, V.M. Popov, A.A. Salnikov, S.I. Serednyakov, V.V. Shary, Yu.M. Shatunov, V.A. Sidorov, Z.K. Silagadze, A.N. Skrinsky, A.G. Skripkin, Yu.V. Usov, A.A. Valishev, A.V. Vasiljev, and Yu.S. Velikzhanin

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Physics::Instrumentation and Detectors, Mathematics::Number Theory, Omega, Prime (order theory), law.invention, Nuclear physics, law, Pi, High Energy Physics::Experiment, Collider, Energy (signal processing)
Abstract

The cross section of the $e^+e^-\to\omega\pi^0\to\pi^0\pi^0\gamma$ reaction was measured by the SND detector at VEPP-2M $e^+e^-$ collider in the energy range from threshold up to 1.4 GeV. Results of the cross section fitting by the sum of $\rho$, $\rho^{\prime}$ and $\rho^{\prime\prime}$ contributions are presented.

Published
2000

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