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6 results on '"E.V Popkov"'

2. Search for rare φ decays in π+π−γ final state

Author

D.H Brown, M.A Shubin, S.I. Eidelman, Igor Nesterenko, P.M. Ivanov, B.O Baibusinov, V.A. Sidorov, N.I. Root, E.V Popkov, L.M. Kurdadze, I.G. Snopkov, G.V. Fedotovich, V. S. Banzarov, I.B. Logashenko, V.P. Smakhtin, E. P. Solodov, B.I. Khazin, A. Bondar, L.M. Barkov, B.A. Shwartz, B.L. Roberts, C.M Valine, Yu.V. Yudin, R.R. Akhmetshin, M. Arpagaus, A.V Maksimov, I. A. Koop, G.A Aksenov, V. W. Hughes, T.A. Purlatz, Yu.I Merzlyakov, N.M. Ryskulov, V.M. Titov, Alexander Skrinsky, V.S. Okhapkin, E.A. Perevedentsev, A.A. Ruban, J. A. Thompson, E.V Anashkin, V. A. Astakhov, A.A. Grebeniuk, P.A. Lukin, D.N. Grigoriev, N. Gabyshev, A.I. Sukhanov, A.S. Kuzmin, A.P. Lysenko, and D.V. Chernyak

Subjects
Physics, Nuclear and High Energy Physics, Crystallography, Bremsstrahlung, State (functional analysis), Atomic physics
Abstract

A search for φ radiative decays has been performed using a data sample of about 2.0 million φ decays collected by the CMD-2 detector at VEPP-2M collider in Novosibirsk. From the selected e + e − → π + π − γ events the following results were obtained: B( φ → f 0 (980) γ ) −4 for destructive and B( φ → f 0 (980) γ ) −4 for constructive interference with the Bremsstrahlung process respectively, B( φ → γ → π + π − γ ) −5 for E γ >20 MeV, B( φ → ργ ) −4 . From the selected e + e − → μ + μ − γ events B( φ → μ + μ − γ )=(2.3±1.0)×10 −5 has been obtained for E γ >20 MeV. The upper limit on the P,CP-violating decay η → π + π − has also been placed: B( η → π + π − ) −4 . All upper limits are at 90% C.L.

Published
1997

3. First observation of the decay φ→η′(958)γ

Author

E.V Popkov, E.V Anashkin, B.I. Khazin, P.Yu. Stepanov, D.H Brown, M.A Shubin, V.V Danilov, Yu. M. Shatunov, N.M. Ryskulov, V.P. Smakhtin, A.I. Sukhanov, A.I. Shekhtman, A.P. Lysenko, V.I Ptitzyn, S.I. Eidelman, B.A. Shwartz, M. Arpagaus, T.A. Purlatz, A.A. Grebeniuk, A. V. Klimenkov, P.M. Ivanov, S.G. Zverev, N.I. Root, A.A. Polunin, G.V. Fedotovich, A.G. Shamov, V. W. Hughes, A.A. Ruban, S.E Baru, E. P. Solodov, D.N. Grigoriev, I.B. Logashenko, J. A. Thompson, P.A. Lukin, E.A. Perevedentsev, A.S. Kuzmin, A.G. Chertovskikh, A. Bondar, L.M. Barkov, Yu.V. Yudin, R.R. Akhmetshin, V.A. Sidorov, Vassili Kazanin, V. S. Banzarov, D.V. Chernyak, V.M Aulchenko, Alexander Skrinsky, I. A. Koop, A.V Maksimov, V.S. Okhapkin, B.L. Roberts, N. Gabyshev, L.M. Kurdadze, I.G. Snopkov, and A.S. Dvoretsky

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, law, Branching fraction, Radiative decay, Collider, Event (particle physics), law.invention
Abstract

The decay φ → η ′ γ has been observed by the CMD-2 detector at the e + e − collider VEPP-2M at Novosibirsk. Of 5.5 million produced φ 's, six events of the φ → η ′ γ decay were selected with the expected background less than one event. The corresponding branching ratio is B( φ → η ′ γ )=1.2 +0.7 −0.5 ·10 −4 . It is the first observation of this radiative decay.

Published
1997

4. Measurement of φ meson parameters with CMD-2 detector at VEPP-2M collider

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Meson, Physics::Instrumentation and Detectors, Hadron, Detector, law.invention, Nuclear physics, General purpose, law, Physics::Accelerator Physics, High Energy Physics::Experiment, Collider
Abstract

Results of the measurement of the φ meson parameters with the general purpose detector CMD-2 at the upgraded e + e − collider VEPP-2M at Novosibirsk are presented. This is the first measurement of the four major φ decay modes in a single e + e − experiment. The results based on about 55,600 identified hadronic events are consistent with previous measurements, and have precision comparable to the current world average.

Published
1995

5. Measurement of the e[sup +]e[sup −]→π[sup +]π[sup −] cross-section with the CMD-2 detector

Author

P.Yu. Stepanov, E. G. Pozdeev, Yu. M. Shatunov, P.A. Lukin, T.A. Purlatz, Ivan Koop, V. A. Astakhov, A.A. Grebeniuk, A.G. Shamov, Yu. Y. Yudin, A.S. Kuzmin, A. P. Lysenko, N. Gabyshev, A. V. Klimenkov, B. I. Khazin, D.N. Grigoriev, Evgeny Perevedentsev, Viatcheslav Danilov, Vladimir Smakhtin, N.I. Root, J. A. Thompson, A.E. Bondar, A.G. Chertovskikh, G.V. Fedotovich, D.V. Chernyak, M. Lechner, L. M. Barkov, V. M. Aulchenko, A.A. Ruban, A.A. Polunin, A.I. Shekhtman, S. Eidelman, L.M. Kurdadze, V. W. Hughes, D. H. Brown, Yu.I Merzlyakov, A.S. Dvoretsky, E.V Popkov, E.V. Anashkin, Vladimir A. Sidorov, B. Shwartz, B. L. Roberts, M.A Shubin, N.M. Ryskulov, A.V Maksimov, I. G. Snopkov, V. S. Banzarov, S.E. Baru, V.I Ptitzyn, P.M. Ivanov, E. P. Solodov, G.A Aksenov, Vassili Kazanin, V.S. Okhapkin, S.G. Zverev, M. Arpagaus, I.B. Logashenko, Igor Nesterenko, A.I. Sukhanov, A.N. Skrinsky, R.R. Akhmetshin, and N.S. Bashtovoy

Subjects
Physics, Range (particle radiation), Particle physics, Luminosity (scattering theory), Annihilation, Meson, Detector, Astrophysics::Cosmology and Extragalactic Astrophysics, Particle identification, law.invention, Nuclear physics, Pion, law, Astrophysics::Solar and Stellar Astrophysics, Physics::Accelerator Physics, High Energy Physics::Experiment, Collider
Abstract

The general purpose detector CMD-2 at the VEPP-2M electron-positron collider at Novosibirsk has collected about 11 pb−1 of integrated luminosity in the center-of-mass energy range from 0.36 up to 1.38 GeV. Data in the ρ-meson energy range from 0.61 to 0.96 GeV have been analysed and preliminary results on the e+e−→π+π− cross-section in this energy range are presented.

Published
1998

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

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