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1. 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

2. 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

3. Precise measurements of the hadronic cross sections at the VEPP-2M collider with the CMD-2 detector

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Particle physics, Annihilation, Luminosity (scattering theory), Meson, Hadron, Detector, Atomic and Molecular Physics, and Optics, law.invention, Nuclear physics, law, High Energy Physics::Experiment, Nuclear Experiment, Collider, Astrophysics::Galaxy Astrophysics
Abstract

The current status of the updated results from the CMD-2 detector is presented. The cross sections of e + e − annihilation into hadrons were measured in the c.m. energy range from 0.37 to 1.39 GeV and are based on the total integrated luminosity of about 30 pb −1 . Results of refitting experimental data for the ρ, ω and mesons are reviewed.

Published
2004

4. 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

5. Experimental study of the e+e−→π0γ process in the energy region s=0.60–0.97 GeV

Author

Alexander Valishev, S. I. Serednyakov, Alexander Bogdanchikov, E. E. Pyata, V. P. Druzhinin, V. B. Golubev, Yu. M. Shatunov, V. V. Shary, A. D. Bukin, A. A. Salnikov, A. V. Bozhenok, Yu. V. Usov, T. V. Dimova, Z. K. Silagadze, A. A. Korol, A. V. Vasiljev, A.A. Polunin, E. V. Pakhtusova, A. G. Skripkin, V. N. Ivanchenko, A. V. Berdugin, Konstantin Beloborodov, A.N. Skrinsky, S. V. Koshuba, D.A. Bukin, Vladimir A. Sidorov, and M. N. Achasov

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), Luminosity (scattering theory), Cross section, Astrophysics::High Energy Astrophysical Phenomena, Gamma process, Gamma ray, Vector meson dominance, Magnetic dipole transitions, Astrophysics::Cosmology and Extragalactic Astrophysics, Omega, law.invention, law, High Energy Physics::Experiment, Omega meson, Nuclear Experiment, Collider, Rho meson, Energy (signal processing)
Abstract

Results of the study of the e+e-->pi0 gamma process with SND detector at VEPP-2M collider in the c.m.s. energy range sqrt(s)=0.60-0.97 GeV are presented. Using 36513 selected events corresponding to a total integrated luminosity of 3.4 pb^-1 the e+e-->pi0 gamma cross section was measured. The energy dependence of the cross section was analyzed in the framework of the vector meson dominance model. The data are well described by a sum of phi,omega,rho0->pi0 gamma decay contributions with measured decay probabilities: Br(omega->pi0 gamma)=(9.34+-0.15+-0.31)% and Br(rho0->pi0 gamma)=(5.15+-1.16+-0.73)*10^-4 . The rho-omega relative interference phase is phi(rho,omega}=(-10.2+-6.5+-2.5) degree.

Published
2003

6. Study of the process e+e−→K0LK0S in the c.m. energy range 1.05–1.38 GeV with CMD-2

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), Meson, 010308 nuclear & particles physics, 01 natural sciences, Omega, High Energy Physics - Experiment, 3. Good health, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Energy (signal processing)
Abstract

The process $e^+e^- \to K^0_L K^0_S$ has been studied with the CMD-2 detector using about 950 events detected in the center-of-mass energy range from 1.05 to 1.38 GeV. The cross section exceeds the expectation based on the contributions of the rho(770), omega(782) and phi(1020) mesons only., Comment: 12 pages, 3 figures, uses elsart.cls, submitted to Physics Letters B

Published
2003

7. Absolute calibration of particle energy at VEPP-4M

Author

A. V. Bogomyagkov, V. G. Popov, Oleg Meshkov, V. E. Blinov, A.A. Polunin, Dmitry Shatilov, E. A. Simonov, Yu. A. Tikhonov, V. A. Kiselev, G.M. Tumaikin, S. I. Mishnev, S.A. Nikitin, I. Ya. Protopopov, B.V. Levichev, Evgeny Levichev, Sergey Karnaev, A. I. Naumenkov, and I. B. Nikolaev

Subjects
Physics, Nuclear and High Energy Physics, Meson, Physics::Instrumentation and Detectors, Hadron, Elementary particle, Fermion, Quarkonium, Resonance (particle physics), law.invention, Nuclear physics, law, Calibration, Physics::Accelerator Physics, High Energy Physics::Experiment, Collider, Instrumentation
Abstract

We have started a new series of experiments on a precise measurement of J/Ψ-, Ψ′- mesons and τ-lepton masses at VEPP-4M collider with KEDR detector. Features of the method used for an absolute particle energy calibration based on the resonance depolarization are described.

Published
2002

8. Measurement of the cross section for the process e + e − → K L 0 K S 0 in the energy range 2E=1.05–1.38 GeV with the CMD-2 detector at VEPP-2M

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Meson, Hadron, Detector, Elementary particle, Atomic and Molecular Physics, and Optics, Particle identification, law.invention, Nuclear physics, Cross section (physics), law, Collider
Abstract

The cross section for the process e + e − → K L 0 K S 0 is measured by using approximately 1000 events recorded by the CMD-2 detector at the VEPP-2M collider in the energy range from 1.05 to 1.38 GeV.

Published
2002

9. 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

10. Search for direct production of a2(1320) and f2(1270) mesons in e+e− annihilation

Author

Alexander Bogdanchikov, A. V. Berdyugin, T.V. Dimova, Yu. M. Shatunov, A.A. Polunin, M. S. Dubrovin, Sergey Burdin, A. A. Salnikov, S.E Baru, I. A. Gaponenko, A.A. Drozdetsky, V. B. Golubev, K. I. Beloborodov, A. V. Bozhenok, A. V. Vasiljev, S. V. Koshuba, Vladimir Ivanchenko, V. P. Druzhinin, Z. K. Silagadze, Aleksandr Korol, M. N. Achasov, E. E. Pyata, V.A. Sidorov, Sergey Serednyakov, A.N. Skrinsky, M. S. Korostelev, E.V. Pakhtusova, G. Kukartsev, V. V. Shary, and D.A. Bukin

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

A search for direct production of C-even resonances a2(1320) and f2(1270) in e+e- annihilation was performed with SND detector at VEPP-2M e+e- collider. The upper limits of electronic widths of these mesons were obtained at 90% confidence level: Gamma(a2(1320) \to e+e-) < 0.56 eV, Gamma(f2(1270) \to e+e-) < 0.11 eV., 6 pages, 5 figures, 1 table. Submitted to Phys. Lett. B

Published
2000

11. Study of the process e+e−→π+π−π+π−π0 with the CMD-2 detector

Author

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

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Range (particle radiation), Pion, Electron–positron annihilation, Detector, Center of mass, Atomic physics
Abstract

The process e+e−→π+π−π+π−π0 has been studied in the center of mass energy range 1280 – 1380 MeV using 3.0 pb−1 of data collected with the CMD-2 detector in Novosibirsk. Analysis shows that the cross section of the five pion production is dominated by the contributions of the ηπ+π− and ωπ+π− intermediate states.

Published
2000

12. The e + e −→π0π0γ process below 1.0 GeV

Author

A. V. Vasil’ev, A. A. Drozdetskii, A. A. Salnikov, V. P. Druzhinin, V. B. Golubev, Yu. M. Shatunov, V.A. Sidorov, D. I. Ganyushin, A. V. Bozhenok, A.A. Polunin, S.V. Burdin, G.A. Kukartsev, E. V. Pakhtusova, M. N. Achasov, P.M. Ivanov, V. N. Ivanchenko, Z. K. Silagadze, Konstantin Beloborodov, E. E. Pyata, S. I. Serednyakov, V. V. Sharyi, A. V. Berdyugin, D.A. Bukin, A. A. Korol, A. D. Bukin, Alexander Bogdanchikov, M. S. Korostelev, T.V. Dimova, and S.V. Koshuba

Subjects
Nuclear physics, Physics, Range (particle radiation), Physics and Astronomy (miscellaneous), law, Electron–positron annihilation, Collider, law.invention
Abstract

The e + e −→π0π0 γreaction was studied in the energy range 0.36–0.97 GeV on a VEPP-2M e + e − collider with an SND detector. The decay probabilities were found to be B(ω→ π0π0γ)= (7.8 ±2.7±2.0)×10−5 and B(π→ π0π0γ)= (4.8 −1.8 +3.4 ±0.2)×10−5.

Published
2000

13. Measurement of ω meson parameters in π+π−π0 decay mode with CMD-2

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Meson, Center of mass, Atomic physics
Abstract

About 300 000 e + e − → φ → K 0 L K 0 S events in the center of mass energy range from 984 to 1040 MeV were used for the measurement of the φ meson parameters. The following results have been obtained: σ 0 =(1367±15±21) nb, m φ =(1019.504±0.011±0.033) MeV/c 2 , Γ φ =(4.477±0.036±0.022) MeV, Γ e + e − · B ( φ → K 0 L K 0 S )=(4.364±0.048±0.065)·10 −4 MeV.

Published
2000

14. New measurement of the rare decay φ→η′γ with CMD-2

Author

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

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Luminosity (scattering theory), law, Branching fraction, Electron–positron annihilation, Detector, Collider, law.invention
Abstract

A new measurement of the rare decay φ → η ′ γ performed with the CMD-2 detector at the VEPP-2M collider in Novosibirsk is described. Of the data sample corresponding to the integrated luminosity of 14.5 pb −1 , twenty one events have been selected in the mode η ′→ π + π − η , η → γγ . The following branching ratio was obtained: B( φ → η ′ γ )=(8.2 +2.1 −1.9 ±1.1)·10 −5 .

Published
2000

15. Cross section of the reaction e+e−→π+π−π+π− below 1 GeV at CMD-2

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Cross section (physics), Range (particle radiation), Meson, Branching fraction, Electron–positron annihilation, Intermediate state, Atomic physics
Abstract

Using 3.07 pb −1 of data collected in the energy range 0.60–0.97 GeV by CMD-2, about 150 events of the process e + e − → π + π − π + π − have been selected. The energy dependence of the cross section agrees with the assumption of the a 1 (1260) π intermediate state which is dominant above 1 GeV. For the first time π + π − π + π − events are observed at the ρ meson energy. Under the assumption that all these events come from the ρ meson decay, the value of the cross section at the ρ meson peak corresponds to the following decay width: Γ(ρ 0 →π + π − π + π − )=(2.8±1.4±0.5) keV or to the branching ratio B(ρ 0 →π + π − π + π − )=(1.8±0.9±0.3)·10 −5 .

Published
2000

16. Measurement of φ meson parameters in KL0KS0 decay mode with CMD-2

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Meson, Analytical chemistry, Center of mass, Phi meson
Abstract

About 300 000 e + e − → φ → K 0 L K 0 S events in the center of mass energy range from 984 to 1040 MeV were used for the measurement of the φ meson parameters. The following results have been obtained: σ 0 =(1367±15±21) nb, m φ =(1019.504±0.011±0.033) MeV/c 2 , Γ φ =(4.477±0.036±0.022) MeV, Γ e + e − · B ( φ → K 0 L K 0 S )=(4.364±0.048±0.065)·10 −4 MeV.

Published
1999

17. Observation of the decay φ→ωπ0

Author

I. A. Gaponenko, M. S. Korostelev, V. N. Ivanchenko, V. V. Shary, E. E. Pyata, Yu. S. Velikzhanin, A.N. Skrinsky, Z. K. Silagadze, M. S. Dubrovin, A. V. Berdyugin, Sergey Burdin, S. I. Serednyakov, T. V. Dimova, M. N. Achasov, D.A. Bukin, Vladimir A. Sidorov, A.A. Polunin, S. I. Dolinsky, A. A. Korol, A. A. Salnikov, S. V. Koshuba, V. P. Druzhinin, V. B. Golubev, Yu. M. Shatunov, A. V. Bozhenok, E. V. Pakhtusova, and S.E. Baru

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Meson, Branching fraction, Resonance, Omega, law.invention, Amplitude, law, Pi, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment, Collider
Abstract

The reaction e^+e^- ---> OMEGA+PI0 ---> PI+PI- 2PI0 has been studied with SND detector at VEPP-2M e^+e^- collider in the vicinity of the PHI(1020) meson resonance. The observed interference pattern in the energy dependence of the cross section is consistent with existence of the decay PHI ---> OMEGA+PI0 with a branching ratio of B(PHI ---> OMEGA+PI0)=(4.8+1.9-1.7+-0.8)x10^{-5}. The real and imaginary parts of the decay amplitude were measured. The PHI ---> OMEGA+PI0 decay was observed for the first time.

Published
1999

18. Study of dynamics of φ→π+π−π0 decay with CMD-2 detector

Author

V.A. Sidorov, A.I. Sukhanov, V.I Ptitzyn, D.N. Grigoriev, P.M. Ivanov, B.I. Khazin, V. W. Hughes, Yu. M. Shatunov, D.H Brown, N.I. Root, S.G. Zverev, N.M. Ryskulov, T.A. Purlatz, Ivan Koop, G.V. Fedotovich, S. Eidelman, Igor Nesterenko, B. L. Roberts, A.A. Polunin, L.M. Kurdadze, V.S. Okhapkin, I.G. Snopkov, B.O Baibusinov, J. A. Thompson, A.S. Dvoretsky, Yu.I Merzlyakov, E.V. Anashkin, I.B. Logashenko, G.A Aksenov, A.N. Skrinsky, M. Arpagaus, P.Yu. Stepanov, R.R. Akhmetshin, P.A. Lukin, N. Gabyshev, V.M. Titov, B. Shwartz, V.P. Smakhtin, A.A. Ruban, Yu.V. Yudin, A. Bondar, L.M. Barkov, V. S. Banzarov, V.V Danilov, E. P. Solodov, A.A. Grebeniuk, A.S. Kuzmin, D.V. Chernyak, and A.G. Shamov

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Amplitude, Meson, law, Electron–positron annihilation, Detector, Dalitz plot, Atomic physics, Collider, law.invention
Abstract

A study of the φ → π + π − π 0 decay mode 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. The following parameters of the φ -meson have been measured: Br ( φ → π + π − π 0 )=0.145±0.009±0.003 and δ φ − ω =162±17°. The analysis of the Dalitz plot showed the dominance of the φ → ρπ intermediate mechanism, the limits for the ratio of the direct amplitude of φ →3 π to that of φ → ρπ are −0.16 a 1 φ → π + π − η and direct φ → ργγ have been found for the first time: Br ( φ → π + π − η ) −4 and Br ( φ → ργγ ) −4 at 90% C.L.

Published
1998

19. 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

20. Recent results of the study of hadronic production with the CMD-2 and SND detectors at the VEPP-2M collider

Author

S. I. Serednyakov, N.M. Ryskulov, A. I. Milstein, A.V. Vasiljev, K. Y. Mikhailov, D.N. Grigoriev, A.S. Zaitsev, V.A. Sidorov, D.V. Bondarev, Z. K. Silagadze, Fedor Ignatov, S.E. Baru, E.V. Pakhtusova, I.B. Logashenko, A.E. Bondar, A.L. Sibidanov, Yu.V. Yudin, S.V. Karpov, Alexander Valishev, P. Krokovny, A.N. Skrinsky, A.V. Berdugin, A. Baratt, A.S. Kuzmin, Yuri Shatunov, A.S. Popov, Konstantin Beloborodov, P.A. Lukin, D.A. Bukin, A.V. Otboev, I. A. Koop, D. Epifanov, V.M. Aulchenko, A.A. Ruban, B.A. Shwartz, A. A. Korol, Alexander Bogdanchikov, N.I. Root, T.V. Dimova, S.I. Redin, E.A. Perevedentsev, V.S. Okhapkin, S.V. Koshuba, B.I. Khazin, V. W. Hughes, S.G. Zverev, M. N. Achasov, J. A. Thompson, R.R. Akhmetshin, V. P. Druzhinin, L.M. Barkov, N. Gabyshev, A.A. Polunin, E. P. Solodov, A. P. Lysenko, D.A. Gorbachev, N.S. Bashtovoy, A.A. Grebeniuk, Yu. V. Usov, A.G. Shamov, Vassili Kazanin, A. V. Bozhenok, Igor Nesterenko, G.V. Fedotovitch, I.G. Snopkov, S.I. Eidelman, A. D. Bukin, A.V. Bragin, and V.Sh. Banzarov

Subjects
Physics, Luminosity (scattering theory), Annihilation, Physics and Astronomy (miscellaneous), Meson, Physics::Instrumentation and Detectors, Hadron, Elementary particle, law.invention, Nuclear physics, Particle decay, law, High Energy Physics::Experiment, Vector meson, Collider, Engineering (miscellaneous)
Abstract

The Cryogenic Magnetic Detector (CMD-2) and Spherical Neutral Detector (SND) operated at the VEPP-2M electron-positron collider in the c.m. energy range 360-1380 MeV. The total integrated luminosity above 60 pb–1 has been collected by both detectors. The cross sections of hadronic production have been measured with high precision. New results for the light vector meson parameters and rare decay mode were obtained. PACS: 13.66.Bc Hadron production in e – e + interactions – 13.66.Jn Precision measurements in e – e + interactions

Published
2004

21. New precision measurement of the J/ψ- and ψʹ-meson masses

Author

Evgenii Baldin, D.V. Bondarev, S.E. Baru, Yu. A. Pakhotin, Evgeny Levichev, S. A. Balashov, I. B. Nikolaev, V.R. Groshev, Alexey Maslennikov, A. V. Zatsepin, V.N. Zhilich, Oleg Meshkov, V. V. Petrov, Valery I. Telnov, Sergey Peleganchuk, A. P. Onuchin, A. I. Naumenkov, A. R. Buzykaev, A. I. Shusharo, A. Bondar, S. S. Petrosyan, V.M. Aulchenko, N. Yu. Muchnoi, S.A. Kononov, K. Yu Todyshev, S. E. Mishnev, V.A. Tayursky, Sergey Karnaev, I. Bedny, K. A. Kotov, Olga Beloborodova, E. V. Kremyanskaya, A.G. Shamov, V.A. Sidorov, V. E. Blinov, A.A. Polunin, M.Yu. Barnyakov, A.I. Vorobiov, S.I. Eidelman, Andrey Soukharev, G.M. Tumaikin, A. V. Bogomyagkov, A.N. Skrinsky, Yu. V. Usov, V. A. Kiselev, E. A. Kravchenko, A. N. Yushkov, G.A. Savinov, A. E. Blinov, V. M. Malyshev, S.B. Oreshkin, E. A. Simonov, S.A. Nikitin, Yu. A. Tikhonov, Dmitry Shatilov, G. E. Pospelov, Alexey Talyshev, Yu I. Skovpen, Anton Poluektov, I. Ya. Protopopov, and B.A. Shwartz

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Accuracy and precision, Observational error, Meson, Electron–positron annihilation, Detector, Mass measurement, Absolute calibration, High Energy Physics - Experiment, law.invention, Nuclear physics, Error analysis, law, Calibration, Physics::Accelerator Physics, High Energy Physics::Experiment, Collider, Beam energy
Abstract

A new high precision measurement of the $J/\psi$- and $\psi'$-meson masses has been performed at the VEPP-4M collider using the KEDR detector. The resonant depolarization method has been employed for the absolute calibration of the beam energy. The following mass values have been obtained: $M_{J/\psi} = 3096.917 \pm 0.010 \pm 0.007$ MeV, $M_{\psi'} = 3686.111 \pm 0.025 \pm 0.009$ MeV. The relative measurement accuracy has reached $4. 10^{-6}$ for $J/\psi$ and $7. 10^{-6}$ for $\psi'$, approximately 3 times better than in the previous precise experiments., Comment: 12 pages, 4 tables, 10 figures

Published
2004

22. Beam energy measurement and stabilization at the storage ring VEPP-2M

Author

Yu. M. Shatunov, A.A. Polunin, Ivan Koop, A. P. Lysenko, E. G. Pozdeev, and V. Ptitsin

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Physics::Accelerator Physics, Synchrotron radiation, Atomic physics, Instrumentation, Beam energy, Storage ring, Term (time)
Abstract

Adequate use of storage rings as synchrotron radiation sources requires exact knowledge of parameters like beam energy. This article discusses the long term experience of beam energy measurements at the storage ring VEPP-2M.

Published
1995

23. Study of the processe+e−→π+π−π0in the energy regionsfrom 0.98 to 1.38 GeV

Author

A. A. Salnikov, A. V. Bozhenok, S.V. Burdin, M. N. Achasov, A. V. Vasiljev, Z. K. Silagadze, V.A. Sidorov, A. A. Korol, V. P. Druzhinin, A. D. Bukin, Igor Nesterenko, Yu. V. Usov, V. V. Shary, V. N. Ivanchenko, A. V. Berdyugin, A.N. Skrinsky, V.M. Aulchenko, A.A. Polunin, V. B. Golubev, Yu. M. Shatunov, E.V. Pakhtusova, Konstantin Beloborodov, D.A. Bukin, S. I. Serednyakov, T.V. Dimova, S.V. Koshuba, Alexander Bogdanchikov, and A. G. Skripkin

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Meson, Electron–positron annihilation, Zero (complex analysis), Invariant mass, Vector meson dominance, Omega, Prime (order theory), Energy (signal processing)
Abstract

The cross section of the process $e^+e^-\to \pi^+\pi^-\pi^0$ was measured in the Spherical Neutral Detector experiment at the VEPP-2M collider in the energy region $\sqrt[]{s} = 980 \div 1380$ MeV. The measured cross section, together with the $e^+e^-\to \pi^+\pi^-\pi^0$ and $\omega\pi^+\pi^-$ cross sections obtained in other experiments, was analyzed in the framework of the generalized vector meson dominance model. It was found that the experimental data can be described by a sum of $\omega$, $\phi$ mesons and two $\omega^\prime$ and $\omega^{\prime\prime}$ resonances contributions, with masses $m_{\omega^\prime}\sim 1490$,$m_{\omega^{\prime\prime}}\sim 1790$ MeV and widths $\Gamma_{\omega^\prime}\sim 1210$, $\Gamma_{\omega^{\prime\prime}}\sim 560$ MeV. The analysis of the $\pi^+\pi^-$ invariant mass spectra in the energy region $\sqrt[]{s}$ from 1100 to 1380 MeV has shown that for their descriptionone should take into account the $e^+e^-\to\omega\pi^0\to\pi^+\pi^-\pi^0$ mechanism also. The phase between the amplitudes corresponding to the $e^+e^-\to\omega\pi$ and $e^+e^-\to\rho\pi$ intermediate states was measured for the first time. The value of the phase is close to zero and depends on energy.

Published
2002

24. Review of results from SND detector

Author

Alexander Bogdanchikov, A.A. Polunin, Konstantin Beloborodov, Igor Nesterenko, D.A. Bukin, M. N. Achasov, S. V. Koshuba, V. N. Ivanchenko, A. D. Bukin, T.V. Dimova, A.N. Skrinsky, V. B. Golubev, A. A. Drozdetski, A. V. Berdyugin, A. A. Salnikov, A. G. Skripkin, Z. K. Silagadze, V. V. Shary, V. M. Aulchenko, V. P. Druzhinin, A. V. Bozhenok, E. V. Pakhtusova, D. I. Ganushin, P.M. Ivanov, A. V. Vasiljev, A. A. Korol, Vladimir A. Sidorov, Sergey Serednyakov, and Sergey Burdin

Subjects
Physics, Particle physics, Annihilation, Meson, High Energy Physics::Phenomenology, Nuclear Theory, Detector, Hadron, law.invention, Nuclear physics, Process dynamics, law, Radiative transfer, High Energy Physics::Experiment, Nuclear Experiment, Collider, Energy (signal processing)
Abstract

The review of experimental results obtained with SND detector at VEPP-2M $e^+e^-$ collider in the energy region $\sqrt[]{s}=0.36$ -- 1.38 GeV is given. The presented results include the following items: studies of the light vector mesons radiative decays, OZI-rule and G-parity suppressed $\phi$-meson rare decays, $\phi$-meson parameters measurements, studies of $e^+e^-\to\pi^+\pi^-\pi^0$ process dynamics, $\eta$ and $K_S$ mesons rare decays, $\eta$ and $\phi$ mesons conversion decays, and study of the $e^+e^-$ annihilation into hadrons.

Published
2002

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

Author

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

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

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

Published
2002

26. Measurement of hadronic cross-sections in $e^+e^-$ collisions below 1.4 GeV at CMD

Author

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

Subjects
Physics, Nuclear physics, Particle physics, Electron–positron annihilation, Hadron
Published
2001

27. Measurements of the parameters of theφ(1020)resonance through studies of the processese+e−→K+K−,KSKL,andπ+π−π0

Author

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

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Meson, Electron–positron annihilation, Pi, High Energy Physics::Experiment, Vector meson dominance
Abstract

The cross sections of the processes $e^+e^- \to K^+K^-$, $e^+e^- \to K_SK_L$ and $e^+e^- \to \pi^+\pi^-\pi^0$ were measured in the SND experiment at the VEPP-2M collider in the energy region near the $\phi(1020)$ meson. These measurements were based on about $10^6$ $K^+K^-$, $0.5 \times 10^6$ $K_SK_L$ and $0.4 \times 10^6$ $\pi^+\pi^-\pi^0$ selected events. Themeasured cross sections have been analyzed in the framework of the vector meson dominance model and the main parameters of the $\phi$-resonance were obtained, such as its mass, width, the production cross section and branching ratios of the main decay modes. The measured value of the $\phi$ meson total width, $\Gamma_{\phi} = 4.21 \pm 0.04$ is lower than the present world average of $4.458 \pm 0.032$ MeV. Contributions in addition to the conventional vector meson dominance model were found in the $e^+e^- \to \pi^+\pi^-\pi^0$ reaction cross section.

Published
2001

28. 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

29. Radiative decays of light vector mesons

Author

M.N Achasov, S.E Baru, K.I Beloborodov, A.V Berdyugin, A.V Bozhenok, A.D Bukin, D.A Bukin, S.V Burdin, T.V Dimova, S.I Dolinsky, A.A Drozdetsky, V.P Druzhinin, M.S Dubrovin, I.A Gaponenko, V.B Golubev, V.N Ivanchenko, I.A Koop, A.A Korol, S.V Koshuba, G.A Kukartsev, E.V Pakhtusova, A.A Polunin, V.M Popov, A.A Salnikov, S.I Serednyakov, V.V Shary, Yu.M Shatunov, V.A Sidorov, Z.K Silagadze, Yu.S Velikzhanin, A.V Vasiljev, and A.S Zakharov

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Meson, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Omega, law.invention, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), law, Radiative transfer, Physics::Accelerator Physics, High Energy Physics::Experiment, Collider, Nuclear Experiment
Abstract

The new data on $\rho,\omega,\phi$ radiative decays into $\pi^0\gamma,\eta\gamma,\eta'\gamma$ from SND experiment at VEPP-2M $e^+e^-$ collider are presented., Comment: 5 pages, 2 figures, talk given at 8th International Conference on Hadron Spectroscopy (HADRON 99), Beijing, China, 24-28 Aug 1999

Published
1999
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30. Experiments with the SND detector at the e[sup +]e[sup −] collider VEPP-2M in Novosibirsk

Author

Alexander Valishev, Igor Nesterenko, S. V. Koshuba, V. B. Golubev, Yu. M. Shatunov, A.A. Polunin, V. N. Ivanchenko, A. Varganov, Ivan Koop, A. A. Korol, A.N. Skrinsky, A. V. Berdyugin, I. A. Gaponenko, V. P. Druzhinin, Konstantin Beloborodov, Yu. S. Velikzhanin, T. V. Dimova, Vladimir A. Sidorov, D.A. Bukin, A. V. Savchkov, E. E. Pyata, S. I. Serednyakov, M. S. Dubrovin, Sergey Burdin, A. D. Bukin, P. I. Ivanov, E. V. Pakhtusova, Viatcheslav Danilov, A. P. Lysenko, E. G. Pozdeev, M. N. Achasov, V. V. Shary, A. A. Mamutkin, Z. K. Silagadze, Evgeny Perevedentsev, Yu. V. Usov, M. S. Korostelev, A. V. Bozhenok, A. V. Vasiljev, Vadim Ptitsyn, S. I. Dolinsky, and A. A. Salnikov

Subjects
Nuclear physics, Physics, Antiparticle, Particle physics, Luminosity (scattering theory), Meson, law, Antimatter, Detector, Collider, Particle identification, Lepton, law.invention
Abstract

The experiments carried out with the SND detector at VEPP-2M e+e− collider are described. The total integrated luminosity, collected in the energy range around φ(1020) peak is about 4 pb−1 and in the energy range 2E=1040–1400 MeV—6.5 pb−1. Preliminary results are presented for φ(1020) rare decays, including φ→η′γ,ωπo,πoπoγ,ηπoγ, and for η(550) decays η→e+e−,2πo.

Published
1998

31. 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

32. 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

33. Erratum to: 'Measurement of φ meson parameters in K0K0 decay mode with CMD-2'

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Meson, Mode (statistics)
Published
2001

34. 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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35. The width of the ω-meson

Author

E. V. Pakhtusova, V. P. Druzhinin, A.N. Peryshkin, S. I. Serednyakov, P.V. Vorobyov, A.A. Polunin, V. B. Golubev, Yu. M. Shatunov, V. M. Aulchenko, Vladimir A. Sidorov, V.N. Invanchenko, M. S. Dubrovin, and S. I. Dolinsky

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Meson, Detector, Atomic physics, Value (mathematics), Standard deviation, Storage ring
Abstract

The reaction e+e−→ω→π+π−π0 has been studied with the Neutral Detector at the VEPP-2M storage ring. The value of the ω-meson total width was found to be Г ω = = 8.40 ± 0.10 MeV , that is four standard deviations lower than the rable value.

Published
1987

36. New experiment on the precise comparison of the anomalous magnetic moments of relativistic electrons and positrons

Author

Yu. M. Shatunov, Ivan Koop, S. I. Serednyakov, Isaac Vasserman, A.A. Polunin, P.M. Ivanov, Efim Gluskin, Igor Nesterenko, A.N. Skrinsky, A. P. Lysenko, A.A. Mikhailichenko, Evgeny Perevedentsev, G.Ya. Kezerashvili, and P.V. Vorobyov

Subjects
Physics, Nuclear and High Energy Physics, Positron, Anomalous magnetic dipole moment, Neutron magnetic moment, Magnetic moment, Physics::Accelerator Physics, High Energy Physics::Experiment, Electron, Atomic physics, Electron magnetic dipole moment, Magnetic dipole, Spin magnetic moment
Abstract

A comparison of the anomalous magnetic moments of the electron and positron has been performed using the resonance depolarization method for the VEPP-2M storage ring beams. It has been shown that the difference between the anomalous magnetic moments of the electron and positron does not exceed 1.2×10 −7 with 95% confidence level, in agreement with the CPT -theorem and the principle of relativistic invariance.

Published
1987

37. Investigation of the reaction e+e− → ηπ+π− in the energy range up to 1.4 GeV

Author

S. Eidelman, E. V. Pakhtusova, M. S. Dubrovin, V. N. Ivanchenko, S. I. Serednyakov, A.N. Skrinsky, A.A. Polunin, V. B. Golubev, Yu. M. Shatunov, Vladimir A. Sidorov, V. P. Druzhinin, A. P. Lysenko, and A.N. Peryshkin

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Range (particle radiation), Large Hadron Collider, Branching fraction, Electron–positron annihilation, Resonance, High Energy Physics::Experiment, Electron, Atomic physics, Nuclear Experiment, Energy (signal processing)
Abstract

The reaction e + e − → ηπ + π − has been studied with the Neutral Detector in the CM energy range 1.05–1.40 GeV at VEPP-2M. At the maximum energy the cross section exceeds the prediction of the vector dominance with one ϱ(770). The following upper limits for the electron width times branching ratio into ηπ + π − have been obtained for a resonance with a mass of 1.28 GeV and width of 0.08 GeV observed with the Omega-spectrometer at CERN: Λ ee · B ηππ Λ ee · B ηππ

Published
1986

38. Investigation of the spin precession tune spread in the storage ring

Author

A.A. Polunin, Igor Nesterenko, Yu. M. Shatunov, Ivan Koop, and A. P. Lysenko

Subjects
Larmor precession, Physics, Spin polarization, law, Lattice (order), Physics::Accelerator Physics, Condensed Matter::Strongly Correlated Electrons, Particle accelerator, Atomic physics, Betatron, Synchrotron, Storage ring, law.invention
Abstract

The accuracy in measurements of spin precession frequency by the resonant depolarization technique is limited by the spin tune spread. The spin tune spread depends on the factors related to particles’ betatron and synchrotron oscillations. This dependence is determined by the lattice parameters of the storage rings.(AIP)

Published
1989

39. Specialized storage ring with longitudinally polarized electrons for internal target experiments

Author

A.A. Polunin, P. I. Baturin, B. A. Lazarenko, Ju. G. Ukraintsev, Ivan Koop, B. B. Wojtsekhowski, Yu. M. Shatunov, S. G. Popov, and A. W. Skrinsky

Subjects
Physics, Electron energy, Parametric analysis, Astrophysics::Instrumentation and Methods for Astrophysics, Particle accelerator, Electron, Polarization (waves), law.invention, Nuclear physics, law, Magnet, Physics::Accelerator Physics, Spin-flip, Atomic physics, Storage ring
Abstract

A specialized storage ring NEP with an electron energy up to 220 Mev for nuclear physics experiments using the superthin internal target method is discussed. A list of the relevant design parameters is given. The design of the polarized electron beams complex and double polarization experiments at this facility are described.(AIP)

Published
1989

40. Comparison of the electron and positron anomalous magnetic moments: Experiment 1987

Author

Igor Nesterenko, P.M. Ivanov, S. I. Serednyakov, A.A. Polunin, Efim Gluskin, A.N. Skrinsky, Evgeny Perevedentsev, A.A. Mikhailichenko, Yu. M. Shatunov, P.V. Vorobyov, A. P. Lysenko, G.Ya. Kezerashvili, Ivan Koop, and Isaac Vasserman

Subjects
Physics, Nuclear and High Energy Physics, Antiparticle, Anomalous magnetic dipole moment, Condensed matter physics, Magnetic moment, Electron, Electron magnetic dipole moment, Spin magnetic moment, Magnetic field, Positron, Antimatter, Precession, Atomic physics, Spin (physics), Lepton
Abstract

The anomalous magnetic moments of relativistic electrons and positrons have been compared by measuring the spin precession phase difference at a given time interval. The difference in the anomalous magnetic moments between the electron and the positron has been shown to lie within 1×10 −8 at 95% confidence level, which improves the accuracy of the previous measurements by an order of magnitude.

Published
1989

41. Status of experiments and recent results from CMD-2 detector at VEPP-2M

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Meson, High Energy Physics::Phenomenology, Nuclear Theory, Hadron, Elementary particle, Quarkonium, Particle identification, Nuclear physics, Particle decay, High Energy Physics::Experiment, Nuclear Experiment, Lepton
Abstract

The Cryogenic Magnetic Detector (CMD-2) is shortly described. Preliminary results for the cross sections of e + e − annihilation into hadrons and leptons are presented in the c.m. energy range from 0.37 to 1.39 GeV. The total integrated luminosity of about 26 pb −1 has been collected. The new results for the ϱ and ω meson parameters are reported. The major decay modes of the f meson as well as its rare decays have been observed. The tagged kaons and η mesons in f meson decays were used to look for some decay modes of K S o and η mesons.

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