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23 results on '"Sergey S.A. Sadovsky"'

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. 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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7. Study of the ηη system in the π−p charge exchange reaction at 32 GeV/c with the GAMS-4π spectrometer

Author

V. A. Lishin, Y. Fujii, K. Takamatsu, Yoshiji Yasu, S. Inaba, Valentine Sugonyaev, V.D. Samoylenko, A.M. Blick, A. E. Sobol, T. Tsuru, V. A. Polyakov, S. V. Donskov, V. N. Kolosov, A.V. Singovsky, A. Yu. Zvyagin, Sergey S.A. Sadovsky, Petr P.M. Shagin, Andrey Lednev, Jean Pierre Peigneux, Jean-Pierre Stroot, Freddy Binon, H. Shimizu, A. A. Kondashov, A.V. Dolgopolov, and G.V. Khaustov

Subjects
Nuclear physics, Physics, Range (particle radiation), Pion, Elementary Particle Interactions, Meson, Spectrometer, Partial wave analysis, Proton Synchrotron, Atomic physics, Spin-½
Abstract

A study has been made of the ηη system produced in the π−p charge exchange reaction at 32 GeV/c. The experiment was performed at the IHEP 70‐GeV proton synchrotron with the GAMS‐4π spectrometer. A partial wave analysis has been carried out in the mass range from 1.1 to 3.9 GeV with −t < 0.2 (GeV/c)2 including the waves S, D0, D−, D+, G0, G− and G+. Three states are unambiguously observed in the S‐wave: f0(1370) , f0(1500), and f0(1710). The large accumulated statistic allows to resolve the G(1590) structure into two separate states the f0(1500) and the f0(1710). Two states f0(2100) and f2(1950) are observed in one solution. The f4(2050) is seen in the G0‐wave. A new spin 4 structure observed in the region above 2.7 GeV/c2. This state needs further investigation due to the possible influence of a spin 6 state.

Published
2002
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8. 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

9. 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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10. 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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11. Hodoscope multiphoton spectrometer GAMS-2000

Author

V.M. Buyanov, Alexandre A.V. Inyakin, D. Michotte, Sergey S.A. Sadovsky, G.V. Khaustov, Petr P.M. Shagin, Andrey Lednev, Sergey Donskov, A. Singovsky, Yu.V. Mikhailov, P. Duteil, V.V. Potapov, Valentine Sugonyaev, D.B. D.B. Kakauridze, Vasilij V.A. Kachanov, Yu Y.V. Rodnov, M. Gouanère, Yu.D. Prokoshkin, Jean Pierre Peigneux, T. Mouthuy, V.D. Samoylenko, Freddy Binon, Jean-Pierre Lagnaux, Jean-Pierre Stroot, 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, Photon, Spectrometer, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Detector, Energy–momentum relation, 01 natural sciences, Nuclear physics, Hodoscope, 0103 physical sciences, Fully automatic, Cathode ray, Calibration, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Nuclear Experiment, 010306 general physics, Instrumentation
Abstract

A hodoscope γ spectrometer comprising 1536 lead-glass cells is described. This detector allows the coordinates and the energies of a large number of gammas (up to ≈ 10) to be measured simultaneously and the masses (with an accuracy of 1%) and the momenta of particles decaying into photons to be determined. The use of fast processors allows selection of events by mass, energy and momentum transfer. The procedure for a fully automatic calibration of the spectrometer in an electron beam (with ∼ 1% accuracy) and for its control during long-term physical experiments is described.

Published
1986
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12. 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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13. 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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14. 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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15. 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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16. 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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17. 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

18. 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

19. 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

20. 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

21. 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

22. 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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23. Evidence for a 1$^{-+}$ exotic meson

Author

A.V. A.V. Shtannikov, Freddy Binon, Alexandre A.V. Inyakin, Vasilij V.A. Kachanov, Sergey S.A. Sadovsky, Madjid Boutemeur, Valentine Sugonyaev, Petr P.M. Shagin, L. Massonnet, Charles Bricman, Edward E.A. Knapp, Sergey Donskov, M. Gouanère, Andrey Lednev, Jean Pierre Peigneux, A. Singovsky, D.B. D.B. Kakauridze, Yu Y.V. Rodnov, Jean-Pierre Stroot, G.V. Khaustov, Yu.D. Prokoshkin, V.D. Samoylenko, V. Obraztsov, D. Alde, Jean-Pierre Lagnaux, 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, Quark, Nuclear and High Energy Physics, Particle physics, Meson, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], 010308 nuclear & particles physics, Partial wave analysis, 01 natural sciences, Nuclear physics, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Exotic meson, 010306 general physics, Particle Physics - Experiment
Abstract

A non q q ,J PC = 1 −+ , I G =1 − meson has been observed in the study of the exclusive reaction π−p→π0ηn at 100 GeV. Its mass is (1406±20) MeV. Its width is (180±30) MeV.

Published
1988

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