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Your search keyword '"Igor Nesterenko"' showing total 7 results
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7 results on '"Igor Nesterenko"'

1. Observation of the conversion decay $\phi\to\pi^0e^+e^-$ at CMD-2

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Branching fraction, Atomic physics, Energy (signal processing), High Energy Physics - Experiment
Abstract

Using 15.1^{-1} of data collected by CMD-2 in the $\phi$-meson energy range, the branching ratio of the conversion decay $\phi\to\pi^0e^+e^-$ has been measured for the first time: B(\phi\to\pi^0e^+e^-) = (1.22 \pm 0.34 \pm 0.21) \cdot 10 ^{-5}., Comment: 13 pages, 6 PostScript figures, uses refmerge.sty. To be published in Phys. Lett. B

Published
2000

2. Experiments with longitudinally polarized electrons in a storage ring, using a Siberian snake

Author

F. Kroes, R. Ent, H. J. Bulten, G. Luijckx, J. F. J. van den Brand, M. Ferro-Luzzi, M. Harvey, E. Six, H. de Vries, M. J. J. van den Putte, P.W. van Amersfoort, H. Boer Rookhuizen, Igor Nesterenko, Yu. M. Shatunov, D. Boersma, J.G. Noomen, B. E. Norum, B. L. Militsyn, Ivan Koop, Ricardo Alarcon, J. J. M. Steijger, H. R. Poolman, P. Klimin, L.D. van Buuren, J. van der Laan, C. W. de Jager, D. Geurts, A. P. Lysenko, Th. S. Bauer, P. Heimberg, Dominik Szczerba, Igor Passchier, D. W. Higinbotham, and (Astro)-Particles Physics

Subjects
INTERNAL TARGET, Nuclear Theory, General Physics and Astronomy, Electron, PRECISION-MEASUREMENT, 01 natural sciences, 7. Clean energy, ENERGY, Helium-3, 0103 physical sciences, Neutron, STRUCTURE-FUNCTION G(1)(N), 010306 general physics, Nuclear Experiment, Isotopes of helium, HE-3, Physics, 010308 nuclear & particles physics, Scattering, Polarization (waves), QUASI-ELASTIC SCATTERING, Charged particle, NEUTRON SPIN STRUCTURE, Physics::Accelerator Physics, Atomic physics, Storage ring
Abstract

We report on first measurements with polarized electrons stored in a medium-energy ring and with a polarized internal target. Polarized electrons were injected at 442 MeV (653 MeV), and a partial (full) Siberian snake was employed to preserve the polarization. Longitudinal polarization at the interaction point and polarization lifetime of the stored electrons were determined with laser backscattering. Spin observables were measured for electrodisintegration of polarized He-3, with simultaneous detection of scattered electrons, protons, neutrons, deuterons, and He-3 nuclei, over a large phase space.

Published
2000

3. Study of QED processes e+ e- --> e+ e- gamma, e+ e- gamma gamma with the SND detector at VEPP-2M

Author

Igor Nesterenko, V. N. Ivanchenko, M. S. Dubrovin, Sergey Burdin, A. P. Lysenko, V. B. Golubev, Yu. M. Shatunov, S. I. Serednyakov, D.A. Bukin, E. V. Pakhtusova, A. A. Korol, S.E. Baru, I. A. Gaponenko, M. N. Achasov, A. V. Bozhenok, S. I. Dolinsky, Yu. V. Usov, T. V. Dimova, V. V. Shary, S. V. Koshuba, Vladimir A. Sidorov, A. D. Bukin, Z. K. Silagadze, and V. P. Druzhinin

Subjects
Physics, Particle physics, Physics and Astronomy (miscellaneous), Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Detector, Gamma gamma, law.invention, High Energy Physics - Experiment, law, High Energy Physics::Experiment, Collider, Engineering (miscellaneous), Energy (signal processing)
Abstract

Results of the SND experiment at the VEPP-2M e+ e- collider on the QED processes e+ e- --> e+ e- gamma and e+ e- --> e+ e- gamma gamma with production at large angles are presented. Energy and angular distributions of the final particles were studied. No deviations from QED with an accuracy of 3.8% for the first process and 10.3% for the second were found., Comment: 6 pages, 7 figures, 6 tables; to be published in EPJ-C; one figure replaced

Published
1999

4. Observation of $K_S^0$ semileptonic decays with CMD-2 detector

Author

Yu. M. Shatunov, Ivan Koop, K.Yu. Mikhailov, Igor Nesterenko, S.V. Karpov, N.M. Ryskulov, P.A. Lukin, E. P. Solodov, A.A. Grebeniuk, V.A. Sidorov, A.G. Shamov, N. Gabyshev, A.A. Ruban, M. Arpagaus, S.G. Zverev, B. Shwartz, D.N. Grigoriev, V.S. Okhapkin, V.M. Titov, D.V. Bondarev, A.I. Shekhtman, V.P. Smakhtin, B.I. Khazin, A.S. Popov, V.Sh. Banzarov, P.Yu. Stepanov, R.R. Akhmetshin, T.A. Purlatz, A.N. Skrinsky, Evgeny Perevedentsev, S.E. Baru, Yu.V. Yudin, P.M. Ivanov, N.S. Bashtovoy, E.V. Anashkin, A.I. Sukhanov, N.I. Root, I.B. Logashenko, S. Eidelman, G.V. Fedotovich, L.M. Kurdadze, I.G. Snopkov, V. M. Aulchenko, A.S. Dvoretsky, J. A. Thompson, A.V. Bragin, A.G. Chertovskikh, A.S. Kuzmin, D.V. Chernyak, A. Bondar, and L.M. Barkov

Subjects
Nuclear physics, Physics, High Energy Physics - Experiment (hep-ex), Nuclear and High Energy Physics, Particle physics, law, Branching fraction, Detector, FOS: Physical sciences, Collider, law.invention, High Energy Physics - Experiment
Abstract

The decay $K_S^0 \to \pi e \nu$ has been observed by the CMD-2 detector at the e^+e^- collider VEPP-2M at Novosibirsk. Of 6 million produced $K_L^0K_S^0$ pairs, $75 \pm 13$ events of the $K_S^0 \to \pi e \nu$ decay were selected. The corresponding branching ratio is $B(K_S^0 \to \pi e \nu)=(7.2 \pm 1.4)\times10^{-4}$. This result is consistent with the evaluation of $B(K_S^0 \to \pi e \nu)$ from the $K_L^0$ semileptonic rate and $K_S^0$ lifetime assuming $\Delta S=\Delta Q$ ., Comment: 7 pages, 6 figures, LaTex2e. Submitted to Phys.Lett.B

Published
1999

5. a_1(1260) dominance in the process e+e- \to 4\pi at energies 1.05--1.38 GeV

Author

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

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Range (particle radiation), Electron–positron annihilation, Atomic physics, High Energy Physics - Experiment
Abstract

First results of the study of the process e+e- \to 4\pi by the CMD-2 collaboration at VEPP-2M are presented for the energy range 1.05--1.38 GeV. Using an integrated luminosity of 5.8 pb^{-1}, energy dependence of the processes e+e- \to \pi^+\pi^- 2\pi^0 and e+e- \to 2\pi^+ 2\pi^- has been measured. Analysis of the differential distributions demonstrates the dominance of the a_1\pi and \omega\pi intermediate states. Upper limits for the contributions of other alternative mechanisms are also placed., Comment: 31 pages, 13 figures, LaTex2e

Published
1999

6. Study of KS KL Coupled Decays and KL -Be Interactions with the CMD-2 Detector at VEPP-2M Collider

Author

V.A. Sidorov, Igor Nesterenko, B.O Baibusinov, A.E Sher, I. A. Koop, N.M. Ryskulov, J. A. Thompson, E.A. Perevedentsev, N.I. Root, G.V. Fedotovich, D.H Brown, M.A Shubin, V.G Zavarzin, V.V Danilov, Yu. M. Shatunov, A.P. Lysenko, S.I. Eidelman, A.A. Ruban, S.I. Redin, V.M. Titov, A.A. Grebeniuk, Yu.V. Yudin, A. Bondar, L.M. Barkov, A.A. Polunin, V.P. Smakhtin, A.I. Sukhanov, E.V Popkov, D.N. Grigoriev, V.M Aulchenko, B.A. Shwartz, E.V Anashkin, A.V Maksimov, B.I. Khazin, Alexander Skrinsky, B.L. Roberts, I.B. Logashenko, V. S. Banzarov, E. P. Solodov, G.A Aksenov, A.S. Kuzmin, V.I Ptitzyn, P.M. Ivanov, D.V. Chernyak, V.S. Okhapkin, I.G. Snopkov, S. K. Dhawan, Yu.I Merzlyakov, S.E Baru, T. A. Purlats, P.A. Lukin, C.M Valine, W. A. Worstell, V. W. Hughes, N. Gabyshev, P. Cushman, R.R. Akhmetshin, and J. P. Miller

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Luminosity (scattering theory), Meson, Detector, High Energy Physics::Phenomenology, Charged particle, law.invention, High Energy Physics - Experiment, Nuclear physics, Angular distribution, law, High Energy Physics::Experiment, Collider, Beam (structure)
Abstract

The integrated luminosity about 4000 inverse nanobarn of around phi meson mass ( 5 millions of phi mesons) has been collected with the CMD-2 detector at the VEPP-2M collider. A latest analysis of the KS KL coupled decays based on 30 % of available data is presented in this paper. The KS KL pairs from phi meson decays were reconstructed in the drift chamber when both kaons decayed into two charged particles. From a sample of 1423 coupled decays a selection of candidates to the CP violating KL into pi+ pi- decay was performed. CP violating decays were not identified because of the domination of events with a KL regenerating at the Be beam pipe into KS and a background from KL semileptonic decays. The regeneration cross section of 110 MeV/c KL mesons was found to be 53 +- 17 mb in agreement with theoretical expectations. The angular distribution of KS mesons after regeneration and the total cross section of KL for Be have been measured., Comment: 14 pages, 8 figures

Published
1997

7. Measurement of e+e−→π+π− cross-section with CMD-2 around ρ-meson

Author

S.V. Karpov, E. A. Kuraev, Igor Nesterenko, I. Logashenko, B.I. Khazin, A.N. Skrinsky, V.A. Sidorov, P.A. Lukin, L.M. Kurdadze, I.G. Snopkov, A.E. Bondar, K.Yu. Mikhailov, N.I. Root, J. P. Miller, V.M. Titov, E. P. Solodov, N.S. Bashtovoy, N. Gabyshev, A. I. Milstein, Yu. M. Shatunov, I. A. Koop, A.A. Ruban, J. A. Thompson, Andrej Arbuzov, E.V. Anashkin, L.M. Barkov, D.V. Bondarev, Yu. Y. Yudin, A.S. Kuzmin, N.M. Ryskulov, V.M. Aulchenko, A.I. Sukhanov, V.P. Smakhtin, B.A. Shwartz, F.V. Ignatov, Vassili Kazanin, P.Yu. Stepanov, S. K. Dhawan, A.S. Popov, D.A. Gorbachev, A.V. Bragin, V. W. Hughes, S.G. Zverev, D.V. Chernyak, A. A. Grebenuk, A.L. Sibidanov, P. Krokovny, T.A. Purlatz, G.V. Fedotovich, A.G. Shamov, R.R. Akhmetshin, A.A. Polunin, D.N. Grigoriev, A. P. Lysenko, V.Sh. Banzarov, V.S. Okhapkin, S.I. Eidelman, S.E. Baru, and B. L. Roberts

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Muon, Meson, Anomalous magnetic dipole moment, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Electron–positron annihilation, Hadron, Form factor (quantum field theory), 01 natural sciences, High Energy Physics - Experiment, law.invention, Nuclear physics, Pion, law, 0103 physical sciences, Physics::Accelerator Physics, High Energy Physics::Experiment, 010306 general physics, Collider
Abstract

The cross section of the process e+e- -> pi+pi- has been measured using about 114000 events collected by the CMD-2 detector at the VEPP-2M e+e- collider in the center-of-mass energy range from 0.61 to 0.96 GeV. Results of the pion form factor determination with a 0.6% systematic uncertainty are presented. Implications for the hadronic contribution to the muon anomalous magnetic moment are discussed., Comment: 17 pages, 4 figures, submitted to PLB

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