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38 results on '"Alexei A.V. Kulik"'

1. Study off o (995) resonance in the ?0?0 decay channel

Author

V.D. Samoylenko, Valentine Sugonyaev, V.A. Polyakov, V. A. Lishin, Madjid Boutemeur, M. Poulet, A.V. A.V. Shtannikov, A. A. Kondashov, G.V. Khaustov, M. Gouanère, A.V. Singovsky, Yu.D. Prokoshkin, Vasilij V.A. Kachanov, Andrey Lednev, D. Alde, Alexandre A.V. Inyakin, Alexei A.V. Kulik, Sergey S.A. Polovnikov, Greg Landsberg, Freddy Binon, Sergey Donskov, Sergey S.A. Sadovsky, Petr P.M. Shagin, Edward E.A. Knapp, Charles Bricman, Jean-Pierre Stroot, and Jean Pierre Peigneux

Subjects
Physics, Amplitude, Physics and Astronomy (miscellaneous), Spectrometer, Partial wave analysis, Resonance, Channel (broadcasting), Atomic physics, Engineering (miscellaneous)
Abstract

A high-statistics study of the π0π0-system produced in the π-p→π0π0n reaction at 38GeV/c has been carried out at the IHEP accelerator using the GAMS-2000 multiphoton spectrometer. A partial-wave analysis which includesS, D0, D− andD+ waves has been performed in the |t|-range up to 1 (GeV/c)2. TheS*/f0(980) resonance is seen as a dip in theS-wave amplitude at small |t|. A distinct peak with a mass of 997±5MeV and a width of 48±10MeV is observed in theS-wave at |t|>0.3 (GeV/c)2. The production cross sections are measured.

Published
1995
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2. Partial-wave analysis of the ??0-system at high masses

Author

Valentine Sugonyaev, M. Gouanère, Sergey S.A. Sadovsky, G.V. Khaustov, Sergey Donskov, Petr P.M. Shagin, Freddy Binon, V.D. Samoylenko, Teruo Nakamura, V. A. Lishin, Alexei A.V. Kulik, Sergey S.A. Polovnikov, Vasilij V.A. Kachanov, Makoto Kobayashi, A.V. Singovsky, T. Kinashi, Andrey Lednev, Yu.D. Prokoshkin, Greg Landsberg, A.V. A.V. Shtannikov, Jean Pierre Peigneux, M. Poulet, A. A. Kondashov, Kunio Takamatsu, Jean-Pierre Stroot, Alexandre A.V. Inyakin, D. Alde, Tsuneaki Tsuru, V.A. Polyakov, C. Bricman, Madjid Boutemeur, A.V. Dolgopolov, Susumu Inaba, and Edward E.A. Knapp

Subjects
Physics, Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, Partial wave analysis, Elementary particle, State (functional analysis), 01 natural sciences, Nuclear physics, Particle acceleration, Hadron spectroscopy, 0103 physical sciences, Field theory (psychology), Quantum field theory, 010303 astronomy & astrophysics, Engineering (miscellaneous), Excitation
Abstract

Recent results on ωπ0 partial-wave analysis from the GAMS Collaboration are presented. A partial-wave analysis of the 38 GeV/c π-p charge exchange data confirmed the existence of theρ(2200) radial-orbital excitation of theρ(770) ground-state observed earlier in the same experiment. A new 5−− state,π5(2350), was also observed in this analysis. Masses, widths and production cross-sections for these states are given.

Published
1995
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3. Measurement of the ω→ηγ decay rate

Author

Jean-Pierre Stroot, V. A. Lishin, Jean Pierre Peigneux, M. Poulet, A. A. Kondashov, Valentine Sugonyaev, V.A. Polyakov, Sergey S.A. Sadovsky, Petr P.M. Shagin, V.D. Samoylenko, Sergey Donskov, G.V. Khaustov, Yu.D. Prokoshkin, Madjid Boutemeur, M. Gouanère, C. Bricman, Vasilij V.A. Kachanov, Alexandre A.V. Inyakin, Edward E.A. Knapp, A.V. A.V. Shtannikov, A.V. Singovsky, Andrey Lednev, D. Alde, Sergey S.A. Polovnikov, Alexei A.V. Kulik, Freddy Binon, and Greg Landsberg

Subjects
Physics, Nuclear physics, Pion, Photon, Spectrometer, Branching fraction, Momentum transfer, Radiative decay, Atomic physics, Mixing (physics)
Abstract

The branching ratio of the rare radiative decay ω→ηγ has been measured: BR(ω→ηγ)=(8.3±2.1)·10−4. The experiment was performed at the IHEP (Serpukhov) accelerator with 38 GeV/c incident pions in the chargeexchange reaction π-p→ωn the photons from the ω→ηγ→3γ decay being detected with the multiphoton spectrometer GAMS-2000. The influence of ω-ρ mixing, which was a source of ambiguity in the interpretation of previous experiments, has been much reduced by measuring the ω produced at large momentum transfer.

Published
1994
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4. Partial-wave analysis of the ωπ0 system at high masses

Author

Sergey Donskov, Kunio Takamatsu, Madjid Boutemeur, Sergey S.A. Sadovsky, Petr P.M. Shagin, Greg Landsberg, C. Bricman, V. A. Polyakov, Valentine Sugonyaev, M. Gouanère, V. A. Lishin, Freddy Binon, Yu.D. Prokoshkin, Susumu Inaba, G.V. Khaustov, D. Alde, M. Kobayashi, Sergey S.A. Polovnikov, M. Poulet, A. A. Kondashov, Tsuneaki Tsuru, Alexandre A.V. Inyakin, V.D. Samoylenko, G. L. Lanberg, Jean Pierre Peigneux, Alexei A.V. Kulik, Edward E.A. Knapp, Vasilij V.A. Kachanov, A.V. A.V. Shtannikov, A.V. Singovsky, T. Nakamura, Jean-Pierre Stroot, and Andrey Lednev

Subjects
Physics, Nuclear physics, Partial wave analysis, State (functional analysis), Atomic physics, Excitation, Charge exchange
Abstract

Recent results on ωπ0 partial-wave analysis from the GAMS Collaboration are presented. A partial-wave analysis of the 38 GeV/c π-p charge exchange data confirmed the existence of theρ(2200) radial-orbital excitation of theρ(770) ground-state observed earlier in the same experiment. A new 5−− state,π 5(2350), was also observed in this analysis. Masses, widths and production cross-sections for these states are given.

Published
1994
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5. Model-independent measurement ofω→ηγ decay branching ratio

Author

M. Poulet, A. A. Kondashov, V.A. Polyakov, V. A. Lishin, Sergey Donskov, A.V. A.V. Shtannikov, C. Bricman, Edward E.A. Knapp, V.D. Samoylenko, Sergey S.A. Sadovsky, M. Gouanère, Yu.D. Prokoshkin, Petr P.M. Shagin, Madjid Boutemeur, V.P. Sugonyaev, Greg G.L. Landsberg, Vasilij V.A. Kachanov, D. Alde, G.V. Khaustov, Sergey S.A. Polovnikov, Jean-Pierre Stroot, Jean Pierre Peigneux, Freddy Binon, Alexandre A.V. Inyakin, A.V. Singovsky, Andrey Lednev, and Alexei A.V. Kulik

Subjects
Nuclear physics, Physics, Particle physics, Physics and Astronomy (miscellaneous), Spectrometer, law, Branching fraction, Momentum transfer, Particle accelerator, Engineering (miscellaneous), law.invention
Abstract

The rare ηγ decay width of the ω-meson has been measured in a model-independent way, with ω produced in 38 GeV/c π−p charge-exchange. Large momentum transfer events have been selected in order to eliminate ω-ρ interference contribution. BR (ω→ηγ) =(8.3±2.1)·10−4. The gammas from ω→ηγ→3γ decay have been detected with the multiphoton spectrometer GAMS-2000 at the IHEP 70 GeV proton accelerator.

Published
1994
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6. Production mechanism of the X (1740) meson

Author

Edward E.A. Knapp, Jean-Pierre Stroot, D. Alde, Alexei A.V. Kulik, Petr P.M. Shagin, A.A. Lednev, Sergey S.A. Polovnikov, C. Bricman, Alexander Inyakin, M. Poulet, G.V. Khaustov, Greg Landsberg, V.P. Sugonyaev, Freddy Binon, Vassili Kachanov, Sergey Donskov, M. Gouanère, D. Prokoshkin Yu, V.D. Samoylenko, S. A. Sadovsky, M. Boutemeur, Jean Pierre Peigneux, A.V. Singovsky, A.V. A.V. Shtannikov, Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), GAMS, and BOMBAR, Claudine

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Meson, 010308 nuclear & particles physics, Nuclear Theory, 7. Clean energy, 01 natural sciences, Physique atomique et nucléaire, Nuclear physics, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Isobar, High Energy Physics::Experiment, Production (computer science), Neutron, Nuclear Experiment, 010306 general physics, Nucleon, Particle Physics - Experiment
Abstract

New data from π-p charge-exchange at 38 GeV/c confirm the existence of the narrow X (1740) meson, observed in its ηη decay mode. The upper limit on its width is 80 MeV. It is not observed decaying into either η′η, or π0π0. This meson is produced in charge-exchange by a mechanism other than OPE with a nucleon isobar (probably Δ(1232)), and not with a neutron., SCOPUS: ar.j, info:eu-repo/semantics/published

Published
1992
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7. Further study of mesons which decay into ωω

Author

M. D. Tabidze, Sergey S.A. Sadovsky, Yu.D. Prokoshkin, Petr P.M. Shagin, Andrey Lednev, Freddy Binon, M. Poulet, Charles Bricman, Valentine Sugonyaev, Yu Y.V. Rodnov, M. Gouanère, Sergey Donskov, Edward E.A. Knapp, Vasilij V.A. Kachanov, D. Alde, V.D. Samoylenko, Jean Pierre Peigneux, A. Singovsky, Alexandre A.V. Inyakin, Alexei A.V. Kulik, A.V. A.V. Shtannikov, G.V. Khaustov, M. Boutemeur, and Jean-Pierre Stroot

Subjects
Physics, Nuclear and High Energy Physics, Measurement method, Particle physics, Meson, 010308 nuclear & particles physics, Branching fraction, Resonance, Observable, 01 natural sciences, Nuclear physics, 0103 physical sciences, Mass spectrum, Tensor, 010306 general physics
Abstract

The π − p→ ωω n reaction has been further studied at 38 GeV/ c with increased statistics. The peak at 2 GeV that has been previously observed in the ωω mass spectrum is due to two resonances. The first one is a tensor meson with a mass of 1920 MeV. The second is f 4 (2050). The branching ratio BR [f 4 (2050)→ ωω ] = 0.26±0.06 has been measured.

Published
1990
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8. Observation of the ω→π0π0γ decay

Author

Petr P.M. Shagin, Freddy Binon, G.V. Khaustov, V. A. Lishin, S. A. Sadovsky, M. Poulet, A. A. Kondashov, M. Gouanère, Edward E.A. Knapp, Greg Landsberg, Madjid Boutemeur, V A. Polovnikov, Jean-Pierre Stroot, V.D. Samoylenko, V.P. Sugonyaev, Alexander Inyakin, Vassili Kachanov, S A. Polyakov, Alexei A.V. Kulik, D. Alde, Charles Bricman, Sergey Donskov, A.A. Lednev, D. Prokoshkin Yu, Jean Pierre Peigneux, A.V. A.V. Shtannikov, and A.V. Singovsky

Subjects
Normalization (statistics), Physics, Nuclear and High Energy Physics, Spectrometer, 010308 nuclear & particles physics, Branching fraction, Gamma ray, Radiative decay, 01 natural sciences, Omega, Nuclear physics, 0103 physical sciences, Pi, Atomic physics, 010306 general physics
Abstract

The rare radiative decay ω → π 0 π 0 γ has been detected with the GAMS-2000 multiphoton spectrometer at the IHEP 70 GeV accelerator. The ω → π 0 γ decay events have been used for normalization. The measured branching ratio is BR( ω → π 0 π 0 γ )=(7.2±2.6)×10 −5 .

Published
1994
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9. Study of the $\pi^{0}\pi^{0}$ system in pp central collisions at 450 GeV/c

Author

Kunio Takamatsu, Alexei A.V. Kulik, Yoshiji Yasu, G.V. Khaustov, D. Alde, A. Brez, M. Boutemeur, Makoto Kobayashi, Yu.D. Prokoshkin, R. Bellazzini, V. A. Lishin, V.A. Polyakov, Jean Pierre Peigneux, Petr P.M. Shagin, A.A. Lednev, Takemi Nakagawa, M.R. Torquati, Teruo Nakamura, Freddy Binon, Hajime Shimizu, Greg Landsberg, Susumu Inaba, M. Poulet, Alexander Inyakin, Sergey Donskov, V.P. Sugonyaev, T. Ishida, T. Kinashi, Tsuneaki Tsuru, S. A. Sadovsky, V.D. Samoylenko, A.V. Singovsky, A. A. Kondashov, M. Gouanère, Edward E.A. Knapp, H. Kawai, Marco Maria Massai, C. Bricman, Jean-Pierre Stroot, A.V. A.V. Shtannikov, Sergey S.A. Polovnikov, BOMBAR, Claudine, Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), and GAMS

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, 01 natural sciences, Nuclear physics, Effective mass (solid-state physics), 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Particle Physics - Experiment, Charge exchange
Abstract

The effective mass spectrum of π0 pairs produced in pp central collisions (pp → pfπ0π0ps) at 450 GeV/c, s = 29 GeV , below 1 GeV differs from that observed in peripheral charge exchange reactions. In particular, there is a large number of events between ππ-threshold and 1 GeV, that interfere with f0(980) destructively. The possible existence of a broad S-wave state is suggested.

Published
1997

10. Studies of the reaction π-p→η′π0n at 38 and 100 GeV/c

Author

A.V. A.V. Shtannikov, G.V. Khaustov, M. Poulet, Sergey S.A. Polovnikov, Alexander Inyakin, Alexei A.V. Kulik, A.A. Lednev, A.V. Singovsky, M. Gouanère, Greg Landsberg, Edward E.A. Knapp, Vassili Kachanov, S. A. Sadovsky, Yu.D. Prokoshkin, Jean Pierre Peigneux, D. Alde, V.P. Sugonyaev, V.D. Samoylenko, Jean-Pierre Stroot, C. Bricman, Freddy Binon, Sergey Donskov, M. Boutemeur, and Petr P.M. Shagin

Subjects
Nuclear physics, Physics, Physics and Astronomy (miscellaneous), Branching fraction, Physique, Mass spectrum, Pi, Astronomie, Engineering (miscellaneous)
Abstract

The production of η′π0 system in π-p charge-exchange interactions at π- momenta 38 GeV/c and 100 GeV/c has been studied. The 2γ and ηπ0π0 decay modes of η′ leading to 4γ and 8γ final states respectively have been detected. No statistically significant peak is observed in the η′π0 mass spectrum in the range of 1.2 GeV÷2.1 GeV. An upper limit of 6·10-3 has been established for the a20(1320)→η′π0 branching ratio. © 1992 Springer-Verlag., SCOPUS: ar.j, info:eu-repo/semantics/published

Published
1992

11. Study of the ωπ+ system

Author

Sergey S.A. Polovnikov, B. Bencheikh, A. Alde, Petr P.M. Shagin, Jean Pierre Peigneux, V.P. Sugonyaev, Susumu Inaba, Yu.D. Prokoshkin, M. Boutemeur, A.A. Lednev, A.V. Singovsky, E. G. Chikovani, Makoto Kobayashi, Sergey Donskov, M. D. Tabidze, S. A. Sadovsky, G.V. Khaustov, Jean-Pierre Stroot, Freddy Binon, Alexander Inyakin, Alexei A.V. Kulik, Charles Bricman, Vassili Kachanov, T. Nakamura, M. Gouanère, Tsuneaki Tsuru, V.D. Samoylenko, A.V. A.V. Shtannikov, M. Poulet, Greg Landsberg, Edward E.A. Knapp, and Kunio Takamatsu

Subjects
Physics, Physics and Astronomy (miscellaneous), Meson, Physique, Nuclear Theory, Elementary particle, Astronomie, Omega, Cross section (geometry), Nuclear physics, Mass spectrum, Field theory (psychology), High Energy Physics::Experiment, Quantum field theory, Nuclear Experiment, Engineering (miscellaneous), Excitation
Abstract

The mass spectra of the ωπ0 system, produced in π-p charge-exchange reactions at 38 GeV/c and 100 GeV/c, show a new neutral state with a mass of 2200±20 MeV and a width of 260±50 MeV. Like ρ3(1690), this meson, X(2200), is produced through one-pion-exchange. X(2200)JPC is likely 1--. It might be a 23D1 radial-orbital excitation of ρ0. Its production cross section falls with energy quadratically, in agreement with one-pion-exchange. The cross sections for b1(1235) and ρ3(1690) production have also been measured; their energy dependences have been determined. © 1992 Springer-Verlag., SCOPUS: ar.j, info:eu-repo/semantics/published

Published
1992

12. Further studies of the X(1910) meson

Author

Kunio Takamatsu, V.P. Sugonyaev, T. Nakamura, M. Gouanère, Alexandre A.V. Inyakin, D. Alde, Edward E.A. Knapp, Tsuneaki Tsuru, Masakazu Kobayashi, V.D. Samoylenko, Sergey S.A. Sadovsky, Jean-Pierre Stroot, Sergey Donskov, Petr P.M. Shagin, Alexei A.V. Kulik, Yu.D. Prokoshkin, Vasilij V.A. Kachanov, Sergey S.A. Polovnikov, G.V. Khaustov, V. A. Lishin, C. Bricman, Jean Pierre Peigneux, Freddy Binon, M. Poulet, Greg Landsberg, Madjid Boutemeur, Susumu Inaba, A.V. A.V. Shtannikov, A.V. Singovsky, Andrey Lednev, Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), GAMS, and BOMBAR, Claudine

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Meson, 010308 nuclear & particles physics, Resonance, Quantum number, 01 natural sciences, Nuclear physics, Momentum, Cross section (physics), 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], 010306 general physics, Particle Physics - Experiment, Charge exchange
Abstract

New data on the ν′ν system produced in the π−p charge exchange at 38 GeV c momentum confirm the existence of the narrow ν′ν resonance X(1910). The hypothesis of the X(1910) quantum numbers being a JPC = 1−+, forbidden for the q[ovbar|q] meson, is proposed to explain the extremely low limits obtained for X(1910) decays through π0π0, νν and K0sK0s channels and the flat t-dependence of the X(1910) production cross section.

Published
1992

13. Matrix element of the η′(958) → ηπ0π0 decay

Author

Alexei A.V. Kulik, Yu.D. Prokoshkin, A. Singovsky, Charles Bricman, D. Alde, Valentine Sugonyaev, Freddy Binon, A. Possoz, D. Sillou, Jean Pierre Peigneux, Alexandre A.V. Inyakin, M. Gouanère, A.V. A.V. Shtannikov, D.B. D.B. Kakauridze, Sergey S.A. Sadovsky, Petr P.M. Shagin, T. Mouthuy, Jean-Pierre Stroot, Andrey Lednev, Yu Y.V. Rodnov, G.V. Khaustov, Sergey Donskov, P. Duteil, V.D. Samoylenko, Yu.V. Mikhailov, Vasilij V.A. Kachanov, Edward E.A. Knapp, and Jean-Pierre Lagnaux

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Spectrometer, Physics::Accelerator Physics, High Energy Physics::Experiment, Matrix element, Linear matrix, Element (category theory), Nuclear Experiment, Constant (mathematics)
Abstract

The decay η′ → ηπ0π0 → 6γ has been measured accurately with the GAMS-2000 spectrometer in a high statistics experiment performed at the 70 GeV IHEP accelerator. The parameters of a linear matrix element have been obtained which show that it is practically constant, with a slight dependence on only one of the Dalitz variables.

Published
1986
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14. Production of G(1590) in 300 GeV central π−N collisions

Author

D.B. D.B. Kakauridze, Edward E.A. Knapp, D. Alde, Jean-Pierre Lagnaux, A. Brez, V. Obraztsov, Alexandre A.V. Inyakin, Sergey S.A. Sadovsky, Vasilij V.A. Kachanov, Petr P.M. Shagin, Yu.D. Prokoshkin, Jean Pierre Peigneux, Yu Y.V. Rodnov, Charles Bricman, Madjid Boutemeur, R. Bellazzini, M.R. Torquati, A.V. Singovsky, Sergey Donskov, Alexei A.V. Kulik, Andrey Lednev, Marco Maria Massai, A.V. A.V. Shtannikov, Jean-Pierre Stroot, M. Gouanère, Valentine Sugonyaev, L. Massonnet, Freddy Binon, V.D. Samoylenko, G.V. Khaustov, BOMBAR, Claudine, Laboratoire d'Annecy de Physique des Particules (LAPP), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], 010308 nuclear & particles physics, Glueball, Scalar (mathematics), 01 natural sciences, Nuclear physics, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Pi, 010306 general physics, Particle Physics - Experiment
Abstract

Significant production of G(1590), a scalar glueball candidate, is observed in a study of η pairs produced in π−N central collisions at 300 GeV/c.

Published
1988
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15. Observation of the decay η → π0γγ

Author

Yu Y.V. Rodnov, Jean Pierre Peigneux, Jean-Pierre Stroot, S. A. Sadovsky, Freddy Binon, Vasilij V.A. Kachanov, V.P. Sugonyaev, D.B. D.B. Kakauridze, Alexandre A.V. Inyakin, Jean-Pierre Lagnaux, V.A. Davydov, J. Dufournaud, A. Singovsky, Alexei A.V. Kulik, Yu.D. Prokoshkin, M. Gouanère, Charles Bricman, Sergey Donskov, A.V. Starzev, G.V. Khaustov, P. Duteil, Andrey Lednev, and Yu.V. Mikhailov

Subjects
Nuclear physics, Physics, Optique, Spectrometer, Hodoscope, Branching fraction, Radiative decay, Physique atomique et moléculaire, Astronomie, Physique atomique et nucléaire, Astrophysique
Abstract

The rare radiative decay η → π0γγ has been effectively observed and studied at the 70 GeV IHEP accelerator with the hodoscope spectrometer GAMS-2000. The branching ratio for this decay is found to be Br(η → π0γγ) = (9.5 ± 2.3)-10-4. © 1982 Società Italiana di Fisica., SCOPUS: ar.j, info:eu-repo/semantics/published

Published
1982
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16. η puzzle: the decay η →π°γγ

Author

M. Gouanère, Vassili Kachanov, Alexander Inyakin, A.A. Lednev, Jean-Pierre Lagnaux, J. Dufournaud, G.V. Khaustov, P. Duteil, Freddy Binon, Sergey Donskov, Yu.D. Prokoshkin, Charles Bricman, S.A. Sadovsky, J.P. Peigneux, V.A. Davydov, Alexei A.V. Kulik, A.V. Startsev, Yu Y.V. Rodnov, A.V. Singovsky, Yu.V. Mikhailov, D.B. D.B. Kakauridze, Jean-Pierre Stroot, and V.P. Sugonyaev

Subjects
Nuclear physics, Physics, Physique, Pi, General Physics and Astronomy, Astronomie, Gamma gamma
Abstract

SCOPUS: ar.j, info:eu-repo/semantics/published

Published
1981
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17. Study of π−p→η′ηn in a search for glueballs

Author

Jean-Pierre Stroot, G.V. Khaustov, P. Duteil, D. Sillou, A. Possoz, Alexandre A.V. Inyakin, Yu Y.V. Rodnov, Yu.D. Prokoshkin, Petr P.M. Shagin, V.P. Sugonyaev, M. Gouanère, A. Singovsky, Alexei A.V. Kulik, Andrey Lednev, Jean Pierre Peigneux, Charles Bricman, Yu.V. Mikhailov, S. A. Sadovsky, Sergey Donskov, T. Mouthuy, Freddy Binon, and Jean-Pierre Lagnaux

Subjects
Physics, Particle physics, Range (particle radiation), Spectrometer, Branching fraction, Scalar (mathematics), Physique atomique et moléculaire, Astronomie, Mesons and meson resonances, Physique atomique et nucléaire, Nuclear physics, +10+GeV%22">Hadron-induced high- and super-high-energy interactions, energy > 10 GeV, Pion beam, Pair production, Optique, Hodoscope, High Energy Physics::Experiment, Hadronic decays of mesons, Nuclear Experiment, Astrophysique, Charge exchange
Abstract

η′η pair production in the charge exchange reaction π-p→η′ηn has been observed and studied in a search for glueballs with the 38 GeV/c pion beam of the 70 GeV IHEP accelerator. The γ-rays from the decay η′η→4γ were detected with the hodoscope spectrometer GAMS-2000. The η′η events in the mass range from threshold up to 1.8 GeV are decays of the scalar G(1590)-meson which has been already observed in its ηη decay mode. The measured ratio of the partial widths of the G→η′η and the G → ηη decay channels is 2.7±0.8 in agreement with the value expected for glueballs. © 1984 Società Italiana di Fisica., SCOPUS: ar.j, info:eu-repo/semantics/published

Published
1984
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18. Decay η' → ωγ

Author

Sergey Donskov, M. Gouanère, D. Alde, Valentine Sugonyaev, Sergey S.A. Sadovsky, Edward E.A. Knapp, Petr P.M. Shagin, Jean-Pierre Lagnaux, Andrey Lednev, V.D. Samoylenko, Charles Bricman, Vasilij V.A. Kachanov, Yu Y.V. Rodnov, Alexei A.V. Kulik, A. Singovsky, G.V. Khaustov, A. Possoz, T. Mouthuy, P. Duteil, D. Sillou, Jean Pierre Peigneux, Jean-Pierre Stroot, Freddy Binon, Yu.D. Prokoshkin, A.V. A.V. Shtannikov, Alexandre A.V. Inyakin, D.B. D.B. Kakauridze, and Yu.V. Mikhailov

Subjects
Nuclear physics, Physics, Spectrometer, Hodoscope, Branching fraction, General Physics and Astronomy
Abstract

The neutral decay of the η'(958)-meson η' → ωγ → π0γγ → 4γ has been studied. The experiment has been performed in the IHEP 70 GeV accelerator with the multiphoton hodoscope spectrometer GAMS-2000. The measured branching ratio of the η' → ωγ decay (BR = 0.0330 ± 0.0036) is found to be in agreement with theoretical predictions.

Published
1987
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19. Evidence for a 1.9 GeV meson decaying into ηη′

Author

Edward E.A. Knapp, Sergey Donskov, Alexei A.V. Kulik, Vasilij V.A. Kachanov, M. Gouanère, Charles Bricman, Alexandre A.V. Inyakin, Yu.D. Prokoshkin, Freddy Binon, Sergey S.A. Sadovsky, Petr P.M. Shagin, V.D. Samoylenko, G.V. Khaustov, Jean Pierre Peigneux, Yu Y.V. Rodnov, Valentine Sugonyaev, A.V. A.V. Shtannikov, A. Singovsky, Andrey Lednev, Jean-Pierre Stroot, and D. Alde

Subjects
Nuclear physics, Scattering cross-section, Physics, Nuclear and High Energy Physics, Particle physics, Meson, Isospin, Nuclear Theory, High Energy Physics::Experiment, Parity (physics), Nuclear Experiment, Particle Physics - Experiment
Abstract

Evidence for a new meson decaying into ηη′ has been found in 38 GeV π − p charge-exchange interactions. The mass and the width of this meson are (1917 ± 15) MeV and (90 −50 +35 ) MeV, respectively. Possible spin and parity assignments are J PC = 0 ++ , 1 −+ or 2 ++ , isospin and G -parity are I G = 0 + . The t -dependence of the differential cross section follows an exponential behaviour exp( bt with a small slope: b = (2±1) (GeV/ c ) −2 .Upper limits on its decay into ππ, ηη and K K exotic interpretation of this meson.

Published
1989
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20. Neutral decays ofη′(958)

Author

G.V. Khaustov, Sergey S.A. Sadovsky, Jean Pierre Peigneux, Petr P.M. Shagin, Vladimir V. Samoylenko, Valentine Sugonyaev, Vasilij V.A. Kachanov, M. Gouanère, Yu Y.V. Rodnov, A.V. A.V. Shtannikov, Jean-Pierre Stroot, Yu.V. Mikhailov, Alexandre A.V. Inyakin, A. Singovsky, D. Alde, Edward E.A. Knapp, T. Mouthuy, Yu.D. Prokoshkin, Andrey Lednev, D.B. D.B. Kakauridze, Charles Bricman, Sergey Donskov, Freddy Binon, Alexei A.V. Kulik, and Jean-Pierre Lagnaux

Subjects
Physics, Particle physics, Physics and Astronomy (miscellaneous), Spectrometer, Physique, 010308 nuclear & particles physics, Parity (physics), Elementary particle, Astronomie, Linear matrix, 01 natural sciences, Nuclear physics, Particle acceleration, 0103 physical sciences, Matrix element, Quantum field theory, 010306 general physics, Engineering (miscellaneous)
Abstract

The partial widths of the η′(958) decays into 2γ, ωγ, 3π0 and ηπ0π0 have been measured with the GAMS-2000 spectrometer at the 70 GeV IHEP accelerator. Upper limits for the η′ decays into 3γ, π0γγ, 2π0 and 4π0 have also been obtained. The slope of a linear matrix element for the G-parity violating decay η′→3π0 has been determined. © 1987 Springer-Verlag., SCOPUS: ar.j, info:eu-repo/semantics/published

Published
1987
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21. Small |t|?? p charge exchange scattering at 40 GeV/c

Author

J. Dufournaud, Yu Y.V. Rodnov, A.V. Starzev, A. E. Yakutin, Sergey Donskov, R. Roosen, A.A. Lednev, Jean Pierre Peigneux, Vassili Kachanov, G.V. Khaustov, Alexandre A.V. Inyakin, D.B. D.B. Kakauridze, P. Duteil, V.P. Sugonyaev, Jean-Pierre Stroot, Yu.D. Prokoshkin, V.A. Davydov, Yu. S. Khodirev, Yu.V. Mikhailov, Jean-Pierre Lagnaux, S. A. Sadovsky, Freddy Binon, M. Gouanère, and Alexei A.V. Kulik

Subjects
Physics, Particle physics, Physics and Astronomy (miscellaneous), Physics::Instrumentation and Detectors, Scattering, Momentum transfer, Scattering length, Nuclear physics, Momentum, Amplitude, Hodoscope, Nuclear Experiment, Engineering (miscellaneous), Particle Physics - Experiment, Charge exchange
Abstract

π−p→π0n differential cross-sections have been measured in the region of small 4-momentum transfer at 40 GeV/c incident momentum. The experiment performed at the IHEP 70 GeV accelerator makes use of a hodoscope γ-spectrometer. Thet- dependence of the cross-section points to a dominance of the spin-flip amplitude.

Published
1981
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22. A hodoscope calorimeter for high energy hadrons: IHEP-IISN-LAPP collaboration

Author

R. Roosen, Alexander Inyakin, V.A. Davidov, Vassili Kachanov, Jean Pierre Peigneux, Sergey Donskov, A.V. Starzev, Alexei A.V. Kulik, Jean-Pierre Lagnaux, Jean-Pierre Stroot, A.A. Lednev, Charles Bricman, J. Dufournaud, B.D. Kakauridze, Yu.K. Mikhailov, Yu.D. Prokoshkin, Yu Y.V. Rodnov, S. A. Sadovsky, M. Gouanère, G.V. Khaustov, Freddy Binon, P. Duteil, and D. Sillou

Subjects
Physics, Particle physics, High energy, Calorimeter (particle physics), Physics::Instrumentation and Detectors, Nuclear Theory, Hadron, General Medicine, Electron, Nuclear physics, Pion, Hodoscope, Antiproton, High Energy Physics::Experiment, Nuclear Experiment, Absorption (electromagnetic radiation)
Abstract

A total absorption hodoscope calorimeter is described. It allows the simultaneous measurement of the energy of the incident hadrons as well as their coordinates with a precision of 1 cm for hadron energies of tens of GeV and higher. The behaviour of the calorimeter is studied with incident pions, kaons, antiprotons and electrons.

Published
1980
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23. Study of ωω systems produced in 38 GeV/c π− p collisions

Author

Yu Y.V. Rodnov, Vasilij V.A. Kachanov, G.V. Khaustov, Sergey S.A. Sadovsky, A. Singovsky, Freddy Binon, Petr P.M. Shagin, Sergey Donskov, Valentine Sugonyaev, Edward E.A. Knapp, M. Gouanère, Alexei A.V. Kulik, V.D. Samoylenko, Alexandre A.V. Inyakin, Jean Pierre Peigneux, M. D. Tabidze, Charles Bricman, Jean-Pierre Stroot, Yu.D. Prokoshkin, Andrey Lednev, A.V. A.V. Shtannikov, and D. Alde

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Photon, Hodoscope, Meson, Atomic physics, Quantum number
Abstract

The π − p→ ωω n reaction has studied for the first time at the 70 GeV IHEP accelerator. The six photons from the decay of the two ω mesons were detected in GAMS-2000, a hodoscope multi-photon spectometer. Two resonances decaying into ωω,X (1640) and X(1960), have been observed. Their quantum numbers are J PC =2 ++ , I G =0 + . The reaction is dominated by the one-pion exchange mechanism. The production cross sections σ. BR(X→ ωω ) are 0.65±0.15 μ b and 1.0±0.2 μ b, respectively.

Published
1989
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24. Neutral decays of the ?-meson

Author

Freddy Binon, Charles Bricman, Alexandre A.V. Inyakin, A. Possoz, G.V. Khaustov, V. A. Maisheev, P. Duteil, Petr P.M. Shagin, Sergey Donskov, Jean-Pierre Lagnaux, D. Sillou, D. Alde, Alexei A.V. Kulik, Yu.M. Mel'nik, A.V. Singovsky, Jean-Pierre Stroot, T. Mouthuy, Yu.V. Mikhailov, Vasilij V.A. Kachanov, Andrey Lednev, Yu.D. Prokoshkin, V.P. Sugonyaev, D.B. D.B. Kakauridze, Yu Y.V. Rodnov, S. A. Sadovsky, Jean Pierre Peigneux, and M. Gouanère

Subjects
Physics, Particle physics, Physics and Astronomy (miscellaneous), Meson, Spectrometer, Physique, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Branching fraction, Nuclear Theory, Dalitz plot, Elementary particle, Astronomie, 01 natural sciences, Physique atomique et nucléaire, Nuclear physics, Particle acceleration, Pion, Hodoscope, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Engineering (miscellaneous)
Abstract

The partial widths of η-meson decays η→2γ, η→3π0 and η→π0γγ have been measured in a high accuracy experiment made at the IHEP accelerator with the hodoscope electromagnetic spectrometer GAMS-2000. An upper limit has been determined for the 3γ channel. The Dalitz plot of the η decay into 3π0 shows that the matrix element does not depend on the pion energy. © 1984 Springer-Verlag., SCOPUS: ar.j, info:eu-repo/semantics/published

Published
1984
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25. Particle identification with a combined hodoscope calorimeter

Author

Valentine Sugonyaev, Yu Y.V. Rodnov, G.V. Khaustov, Sergey S.A. Sadovsky, V.C. Datsko, Petr P.M. Shagin, Sergey Donskov, Jean Pierre Peigneux, A.V. A.V. Shtannikov, V.I. Rykalin, V.D. Samoylenko, A. Singovsky, Freddy Binon, D. Alde, M. Gouanère, D.B. D.B. Kakauridze, Andrey Lednev, Edward E.A. Knapp, Alexandre A.V. Inyakin, Yu.D. Prokoshkin, Vasilij V.A. Kachanov, Alexei A.V. Kulik, Charles Bricman, and Jean-Pierre Stroot

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Calorimeter (particle physics), Meson, Physics::Instrumentation and Detectors, Nuclear Theory, Detector, Hadron, Electron, Particle identification, Nuclear physics, Pion, Hodoscope, High Energy Physics::Experiment, Detectors and Experimental Techniques, Nuclear Experiment, Instrumentation
Abstract

The differences in width and in deposited energy between electromagnetic and hadron showers developed by 18.5 and 38 GeV/c pions and electrons in a combined hodoscope detector composed of a GAMS-type electromagnetic calorimeter and a modular hadron calorimeter allow to reject pions or electrons to a level ⪡ 0.1% keeping a detection efficiency larger than 90% when the other particle is selected. The hadron calorimeter helps to efficiently reject background in studies of multiphoton decays of neutral mesons with GAMS.

Published
1989
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26. Study of D(125)→K+K− π0 decay

Author

V. V. Lapin, S.I. Bitukov, R.I. Dzhelyadin, V. F. Kurshetsov, V. A. Dorofeev, A. S. Konstantinov, V.P. Kubarovsky, V.A. Victorov, S.V. Golovkin, L.G. Landsberg, A. M. Zaitsev, M.V. Gritsuck, Yu.B. Novozhilov, V. F. Konstantinov, V. Obraztsov, Alexei A.V. Kulik, V.I. Solyanik, and V.A. Mukhin

Subjects
Nuclear physics, Differential spectrum, Physics, Nuclear and High Energy Physics, Effective mass (solid-state physics), Hadron, Strong coupling, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment, Order of magnitude
Abstract

Results on the study of D(1285)→K+K− π0-decay are presented. The K+K− effective mass spectrum is measured with statistics which are by an order of magnitude higher than in the previous data. From the analysis of the differential spectrum d N d M KK (in the framework of the δ-dominance model) the δ-meson effective width is Γδ>180MeV/c2 at √s=1 GeV/c2, which means a strong coupling of the δ-meson with hadrons.

Published
1984
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27. Observation of the decay η→μ+μ−γ

Author

L.G. Landsberg, Yu.B. Bushnin, A.M. Zaitsev, R.I. Dzhelyadin, S.V. Golovkin, V. Obraztsov, T.I. Petrunina, D.B. D.B. Kakauridze, V.N. Leontiev, V.A. Mukhin, M.V. Gritsuck, M. Soldatov, N.S. Pokrovski, V.P. Kubarovski, Alexei A.V. Kulik, V. F. Konstantinov, A.S. Konstantinov, Yu.D. Prokoshkin, and Vassili Kachanov

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle decay, Antiparticle, Muon, Spectrometer, Hodoscope, Physics::Instrumentation and Detectors, Branching fraction, Mass spectrum, High Energy Physics::Experiment, Lepton
Abstract

The results of studying the mass spectrum of μ+μ−γ systems produced in πp collisions at 25 GeVc are presented. A wide-aperture magnetic spectrometer with a hodoscope γ-detector was used to identify muon pairs and photons. There is a clear peak in the mass spectrum which corresponds to the decay η→μ+μ−γ previously not observed. The branching ratio for the decay is estimated to be 1.5 × 10−4.

Published
1978
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28. Chi particle production in pi -p collisions at 38 gev/c

Author

G.V. Khaustov, P. Duteil, M. Gouanère, Valentine Sugonyaev, Yu Y.V. Rodnov, Yu.D. Prokoshkin, Jean Pierre Peigneux, Sergey S.A. Sadovsky, T. Mouthuy, Alexei A.V. Kulik, D. Sillou, A. Singovsky, Andrey Lednev, Alexandre A.V. Inyakin, A. Possoz, Sergey Donskov, Jean-Pierre Stroot, Yu.V. Mikhailov, D.B. D.B. Kakauridze, Vasilij V.A. Kachanov, Freddy Binon, Jean-Pierre Lagnaux, Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), and BOMBAR, Claudine

Subjects
Physics, Nuclear and High Energy Physics, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], 010308 nuclear & particles physics, Proton Synchrotron, 01 natural sciences, Nuclear physics, Near threshold, Hodoscope, 0103 physical sciences, Transverse momentum, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Particle, Atomic physics, 010306 general physics, Particle Physics - Experiment
Abstract

The production of χ particles in the reaction π−p → χ + … has been studied near threshold. The measurements have been performed at the 70 GeV IHEP proton synchrotron using the hodoscope spectrometer GAMS-2000. The χ particles have been identified through their decay χ → J/ψ + γ, J/ψ → e+e−. In the region XF ≳0.4 the fraction of obsered J/ψ particles which is obtained via the decay of χ states is 0.44 ± 0.16. The χ longitudinal and transverse momentum distributions are similar to those obtained for J/ψ. The inclusive production cross section of χ particles (3P1 and 3P2 states) at 38 GeV/c is σXF>0 (π−p → χ + …) = (28±11) nb.

Published
1984

29. The isospin-violating decay $\eta$' --> 3$\pi^{0}$

Author

Valentine Sugonyaev, Jean-Pierre Stroot, Yu Y.V. Rodnov, G.V. Khaustov, D. Sillou, Yu.V. Mikhailov, Jean-Pierre Lagnaux, M. Gouanère, Jean Pierre Peigneux, P. Duteil, Vasilij V.A. Kachanov, Yu.D. Prokoshkin, Alexandre A.V. Inyakin, D.B. D.B. Kakauridze, Sergey Donskov, Freddy Binon, Sergey S.A. Sadovsky, Alexei A.V. Kulik, Andrey Lednev, Petr P.M. Shagin, A. Singovsky, T. Mouthuy, and A. Possoz

Subjects
Quark, Physics, Nuclear and High Energy Physics, Particle physics, Spectrometer, Hodoscope, Branching fraction, Isospin, Gamma ray, Particle Physics - Experiment
Abstract

In an experiment performed at the 70 GeV IHEP accelerator the rate decay η '(958) → 3 π 0 , which violates isosoin conservation, has been observed. The six final decay gamma rays are detected in the hodoscope spectrometer GAMS-2000. The branching ratio of this decay is BR ( η ' → 3 π 0 ) = (1.6 ± 0.4) × 10 −3 . An estimate of the ratio of the masses of u and d quarks is given.

Published
1984

30. Observation of a spin-6 neutral meson r(2510)

Author

Vasilij V.A. Kachanov, Freddy Binon, Yu.V. Mikhailov, Alexei A.V. Kulik, A. Singovsky, Jean-Pierre Lagnaux, Alexandre A.V. Inyakin, D.B. D.B. Kakauridze, Andrey Lednev, Sergey Donskov, G.V. Khaustov, Yu Y.V. Rodnov, Yu.D. Prokoshkin, P. Duteil, Jean-Pierre Stroot, V.P. Sugonyaev, S. A. Sadovsky, M. Gouanère, and Jean Pierre Peigneux

Subjects
Physics, Particle physics, Meson, Spectrometer, Physique, PACS. 14.80, General Physics and Astronomy, Resonance, Astronomie, Nuclear physics, Momentum, Other and hypothetical particles, Hodoscope, High Energy Physics::Experiment, Nuclear Experiment, Particle Physics - Experiment, Spin-½
Abstract

In a high-statistics experiment (200 events/nanobarn) performed at the 70 GeV IHEP accelerator, a new dipion resonance has been observed in π-p collisions at 38 GeV/c momentum. The gamma-rays in reaction π-p → M0n, M0 → π0π0 → 4γ have been detected in the hodoscope spectrometer GAMS-2000. The new meson, r(2510), has a mass (2510±30) MeV/c2, a width (240±60) MeV/c2 and spin-parity J PC=6++. The production cross-section of the f, h and r mesons decreases exponentially with spin like exp [-0.9 J]. © 1984 Società Italiana di Fisica., SCOPUS: ar.j, info:eu-repo/semantics/published

Published
1984

31. Observation of a 1750 MeV narrow meson decaying into $\eta\eta$

Author

Vasilij V.A. Kachanov, Valentine Sugonyaev, Sergey Donskov, Yu.V. Mikhailov, Andrey Lednev, M. Gouanère, Alexandre A.V. Inyakin, Yu.D. Prokoshkin, T. Mouthuy, Edward E.A. Knapp, A. Singovsky, Sergey S.A. Sadovsky, Petr P.M. Shagin, Charles Bricman, Jean Pierre Peigneux, A.V. A.V. Shtannikov, Freddy Binon, G.V. Khaustov, Jean-Pierre Lagnaux, Alexei A.V. Kulik, D. Alde, Yu Y.V. Rodnov, D.B. D.B. Kakauridze, V. D. Samoilenko, Jean-Pierre Stroot, Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), and BOMBAR, Claudine

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Spectrometer, Meson, 010308 nuclear & particles physics, Nuclear Theory, Momentum transfer, 01 natural sciences, 7. Clean energy, Nuclear physics, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Particle Physics - Experiment
Abstract

A narrow meson which decays into ηη is observed in 38 GeV/ c π − p collisions at large momentum transfer. The experiment has been performed at the Serpukhov accelerator with the GAMS-2000 spectrometer. The mass of this new meson is (1755 ± 8) MeV, its width is less than 50 MeV. Its spin-parity is J PC =0 ++ or less probably 2 ++ .

Published
1986

32. Hodoscope gamma spectrometer GAMS-200

Author

Jean Pierre Peigneux, Sergey S.A. Sadovsky, J. Dufournaud, Sergey Donskov, Yu.V. Mikhailov, M. Gouanère, D.B. D.B. Kakauridze, Charles Bricman, D. Sillou, Andrey Lednev, Vasilij V.A. Kachanov, A.V. Starzev, V.A. Davydov, Jean-Pierre Stroot, G.V. Khaustov, P. Duteil, Yu.D. Prokoshkin, Alexei A.V. Kulik, Yu Y.V. Rodnov, Alexandre A.V. Inyakin, Valentine Sugonyaev, Jean-Pierre Lagnaux, R. Roosen, and Freddy Binon

Subjects
Momentum, Nuclear physics, Physics, Hodoscope, Spectrometer, Physics::Instrumentation and Detectors, Gamma ray spectrometer, Detector, General Engineering, Cathode ray, Detectors and Experimental Techniques, Nuclear Experiment, Measure (mathematics)
Abstract

A 208 channel hodoscope γ spectrometer, the cells of which are made of lead-glass, is described. This detector makes it possible to measure simultaneously the coordinates (with an accuracy of 1.5 mm), and energy (to a few percent) of a large number of gammas and to reconstruct the mass and momentum of the particles decaying into gammas. The characteristics of the spectrometer have been studied in an electron beam and also under the conditions of real experiments ( π 0 → 2 γ ).

Published
1981

33. Photomultiplier gain tuning system

Author

A. Singovsky, M. Gouanère, Alexei A.V. Kulik, Sergey Donskov, Jean Pierre Peigneux, D. Michotte, Yu.D. Prokoshkin, P. Duteil, Yu.V. Mikhailov, Vasilij V.A. Kachanov, Freddy Binon, Jean-Pierre Stroot, BOMBAR, Claudine, Laboratoire d'Annecy de Physique des Particules (LAPP), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Photomultiplier, 010308 nuclear & particles physics, business.industry, General Engineering, Musical tuning, 01 natural sciences, [PHYS.PHYS.PHYS-INS-DET] Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 0103 physical sciences, Optoelectronics, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Detectors and Experimental Techniques, 010306 general physics, business
Published
1983

34. Production of G(1590) and other mesons decaying into $\eta$ pairs by 100 GeV/c $\pi^{-}$ on protons

Author

A. Singovsky, Jean-Pierre Lagnaux, Alexandre A.V. Inyakin, Valentine Sugonyaev, Yu Y.V. Rodnov, C. D. Lac, Yu.D. Prokoshkin, Sergey Donskov, V. Obraztsov, G.V. Khaustov, Sergey S.A. Sadovsky, J. Dufournaud, T. Mouthuy, P. Duteil, Petr P.M. Shagin, M. Gouanère, D.B. D.B. Kakauridze, D. Sillou, Freddy Binon, D. Alde, Yu.V. Mikhailov, Jean Pierre Peigneux, Alexei A.V. Kulik, Vasilij V.A. Kachanov, Charles Bricman, Edward E.A. Knapp, Jean-Pierre Stroot, A. Possoz, Andrey Lednev, BOMBAR, Claudine, Laboratoire d'Annecy de Physique des Particules (LAPP), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Meson, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], 010308 nuclear & particles physics, Partial wave analysis, Scalar (physics), 01 natural sciences, Angular distribution, Electromagnetic calorimeter, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Particle Physics - Experiment
Abstract

New data on the scalar G(1590) meson which decays into ηη have been obtained in an experiment at the CERN SPS. η pairs are detected with the electromagnetic calorimeter GAMS both through their decay into 4γ and into 8γ. ϵ(1300), f(1270), f′(1525) as well as the spin-4 h(2030) mesons have also been observed to decay in the same mode. Their branching ratios have been evaluated. The presence of high-mass spin-0 and spin-2 structures is discussed.

Published
1985

35. Production of pseudoscalar mesons in 300 GeV central $\pi^{-}N$ collisions

Author

Sergey Donskov, Charles Bricman, Jean Pierre Peigneux, Edward E.A. Knapp, M. Gouanère, A.V. A.V. Shtannikov, D. Alde, Vasilij V.A. Kachanov, V.D. Samoylenko, Alexandre A.V. Inyakin, Freddy Binon, A. Brez, Yu.D. Prokoshkin, Sergey S.A. Sadovsky, Valentine Sugonyaev, Petr P.M. Shagin, L. Massonnet, Alexei A.V. Kulik, Madjid Boutemeur, R. Bellazzini, G.V. Khaustov, A.V. Singovsky, M.R. Torquati, Andrey Lednev, Marco Maria Massai, Jean-Pierre Stroot, Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), and GAMS

Subjects
Physics, Particle physics, Large Hadron Collider, Physics and Astronomy (miscellaneous), Meson, Spectrometer, Physique, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Nuclear Theory, Elementary particle, Astronomie, 01 natural sciences, Momentum, Nuclear physics, Pseudoscalar, Pion, Hodoscope, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Engineering (miscellaneous), Particle Physics - Experiment
Abstract

The exculsive production of π0, η, and η′ mesons in π+N central collisions has been studied with 300 GeV incident pions. The experiment has been performed at the CERN SPS. The gammas from decaying mesons were detected in the hodoscope multiphoton spectrometer GAMS-4000. The measured differential cross sections show a plateau in the longitudinal momentum interval 0.1, SCOPUS: ar.j, info:eu-repo/semantics/published

Published
1988
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36. Observation of η′ → μ+μ−γ decay

Author

V.P. Kubarovski, R.I. Dzhelyadin, N.S. Pokrovski, A.M. Zaitsev, V.A. Mukhin, V.A. Victorov, V. F. Konstantinov, M. V. Gritzuk, A.S. Konstantinov, L.G. Landsberg, V.F. Obrastzov, S.V. Golovkin, T.I. Petrunina, V.M. Leontiev, Alexei A.V. Kulik, Yu.D. Prokoshkin, V.A. Kachonov, and D.B. Kakauridse

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Photon, Muon, Hodoscope, Spectrometer, Physics::Instrumentation and Detectors, Branching fraction, Mass spectrum, Analytical chemistry, High Energy Physics::Experiment
Abstract

The mass spectrum for μ + μ − γ systems produced in π − p interactions at 25 and 33 GeV/ c has been studied. To detect muon pairs and photons a wide-aperture magnetic spectrometer and a hodoscope γ-detector were used. In the mass spectrum a clear peak is seen corresponding to the decay η ′ → μ + μ − γ not previously observed. The branching ratio for this decay, 8 × 10 −5 , is in agreement with the η′ form-factor model, based on vector dominance.

Published
1979
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37. Study of η→μ+μ− decay

Author

Yu.D. Prokoshkin, Alexei A.V. Kulik, Vassili Kachanov, L.G. Landsberg, A.M. Zaitsev, A.S. Konstantinov, V.A. Mukhin, S.V. Golovkin, V.M. Leontiev, V.P. Kubarovsky, V.A. Viktorov, V. Obraztsov, R.I. Dzhelyadin, and V. F. Konstantinov

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Muon, Branching fraction, Mass spectrum, High Energy Physics::Experiment
Abstract

The muon pair mass spectrum in the reactionπ − p→μ + μ − n has been investigated at 25 and 33 GeV/ c . A peak corresponding to the rareη→μ + μ − decay is observed. The measured branching ratio for this decay is (6.5 ± 2.1) × 10 −6 in agreement with theoretical estimates.

Published
1980
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38. Observation of ω → π0 μ+μ− decay

Author

L.G. Landsberg, N.S. Pokrovski, Alexei A.V. Kulik, R.I. Dzhelyadin, A.S. Konstantinov, A.K. Konoplyannikov, M.V. Gritsuk, V. F. Konstantinov, V.A. Victorov, V.P. Kubarovski, V.A. Mukhin, S.V. Golovkin, A.M. Zaitsev, T.I. Petrunina, D.B. D.B. Kakauridze, V. Obraztsov, V.M. Leontiev, Vassili Kachanov, and Yu.D. Prokoshkin

Subjects
Physics, Nuclear physics, Systematic error, Nuclear and High Energy Physics, Photon, Muon, Spectrometer, Hodoscope, Physics::Instrumentation and Detectors, Branching fraction, Mass spectrum, High Energy Physics::Experiment, Nuclear Experiment
Abstract

The results of studying the mass spectrum of μ + μ − γγ systems produced in π − p collisions at 25 and 33 GeV/c presented. The wide-aperture magnetic spectrometer with a hodoscope γ-detector was used to identify muon pairs and photons. There is a clear peak in the mass spectrum which corresponds to the decay ω → π 0 μ + μ − previously not observed. The branching ratio for the decay is estimated to be 9 × 10 −5 with a systematic error of 50%.

Published
1979
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