排序方式: 共有18条查询结果,搜索用时 15 毫秒
1.
I. Kachaev V. Dorofeev A. Ekimov V. Gotman A. Ivashin V. Kalendarev Yu. Khokhlov M. Kholodenko V. Konstantinov V. Matveev M. Mikhasenko V. Nikolaenko A. Plekhanov D. Ryabchikov Yu. Salomatin V. Sugonyaev E. Volkov A. Zaitsev 《Physics of Atomic Nuclei》2015,78(13):1474-1477
Partial wave analysis of the π–A π+π–π– system produced by 29 GeV/cπ– beam on a beryllium target is presented. About 30 × 106 |events in the wide t′|range 0–0.8 GeV2/c 2 are collected with upgraded VES setup. The size of the data sample is 2.5 times larger than one previously analyzed by VES. Data are analyzed using formalism of the density matrix with unlimited rank. We discuss status of the a 1(1420) a 2(1700) a 3(1875) states and a structure of exotic ρ(770)π P-wave with J PC = 1-+. Parameters of a 3(1875) are estimated as M = 1985 ± 20 MeV/c 2, Γ = 200 ± 50 MeV/c 2 (preliminary). 相似文献
2.
A. M. Blik A. M. Gorin S. V. Donskov V. N. Kolosov A. A. Lednev V. A. Lishin Yu. V. Mikhailov V. A. Polyakov V. D. Samoylenko A. E. Sobol V. P. Sugonyaev G. V. Khaustov 《Physics of Atomic Nuclei》2008,71(12):2124-2128
An experiment performed with the GAMS-4π spectrometer resulted in observing 235 ± 45 events of the decay η′ → 3π 0. The respective charge-exchange reaction at a momentum of 32.5 GeV/c was used as a source of η′ mesons. The decay branching ratio was found to be Br(η′ → 3π 0) = (1.8 ± 0.4) × 10?3. The slope parameter of the square of the respective matrix element in the linear approximation proved to be β = ?0.59 ± 0.18. 相似文献
3.
F. Binon A. M. Blik S. V. Donskov S. Inaba V. N. Kolosov A. A. Lednev V. A. Lishin Yu. V. Mikhailov J. P. Peigneux V. A. Polyakov S. A. Sadovsky V. D. Samoilenko A. E. Sobol J. P. Stroot V. P. Sugonyaev K. Takamatsu T. Tsuru I. Fujii G. V. Khaustov H. Shimizu Y. Yasu 《Physics of Atomic Nuclei》2005,68(6):960-973
The ηη system produced in charge-exchange π ? p interaction at a momentum of 32.5 GeV/c is studied in an experiment performed with the GAMS-4π spectrometer at the 70-GeV accelerator of the Institute for High-Energy Physics (IHEP, Protvino). A partial-wave analysis is performed in the mass range between 1.1 and 3.9 GeV for ?t <0.2 (GeV/c)2, S, D, G, and J waves being taken into account in this analysis. The S wave has a complicated structure, displaying peaks at about 1.5 and 1.7 GeV. These peaks are associated with the f 0(1500) and f 0(1710) mesons. One of the solutions (preferable one) involves the f 0(2200) and f 2(1950) resonances. The mass region above 2.4 GeV is dominated by the G wave. A broad state of mass about 3 GeV and width 0.7 GeV is found in the J wave. The parameters of the resonances in question and their production cross sections are measured. 相似文献
4.
D. Alde F. G. Binon M. Boutemeur C. Bricman A. V. Dolgopolov S. V. Donskov M. Gouanere S. Inaba A. V. Inyakin V. A. Kachanov G. V. Khaustov T. Kinashi E. A. Knapp M. Kobayashi A. A. Kondashov A. V. Kulik G. L. Landsberg A. A. Lednev V. A. Lishin T. Nakamura J. P. Peigneux S. A. Polovnikov V. A. Polyakov M. Poulet Yu. D. Prokoshkin S. A. Sadovsky V. D. Samoylenko P. M. Shagin A. V. Shtannikov A. V. Singovsky J. P. Stroot V. P. Sugonyaev K. Takamatsu T. Tsuru 《Zeitschrift fur Physik C Particles and Fields》1995,66(3):379-383
A partial-wave analysis of the ω ωπ0-system produced in the π- p→ωπ0 n reaction at 38 GeV/c beam momentum has been performed. A new 5?- meson state,ρ 5(22350), with a massM=2330±35 MeV and a width Γ=400±100 MeV, is observed. The analysis also confirms the 1?- ρ(2150) meson, a radial-orbital excitation of the ρ(770), observed earlier by the GAMS Collaboration. 相似文献
5.
D. Alde F. G. Binon M. Boutemeur C. Bricman S. V. Donskov M. Gouanère A. V. Inyakin V. A. Kachanov G. V. Khaustov E. A. Knapp A. V. Kulik G. L. Landsberg A. A. Lednev J. P. Peigneux S. A. Polovnikov M. Poulet Yu. D. Prokoshkin S. A. Sadovsky V. D. Samoylenko P. M. Shagin A. V. Shtannikov A. V. Singovsky J. P. Stroot V. P. Sugonyaev 《Zeitschrift fur Physik C Particles and Fields》1992,54(4):549-551
The production of
0 system in
–
p
charge-exchange interactions at
– momenta 38 GeV/c and 100 GeV/c has been studied. The 2 and
0
0 decay modes of
leading to 4 and 8 final states respectively have been detected. No statistically significant peak is observed in the
0 mass spectrum in the range of 1.2 GeV÷2.1 GeV. An upper limit of 6·10–3 has been established for thea
2
0
(1320)
0 branching ratio. 相似文献
6.
D. Alde F. Binon C. Bricman S. V. Donskov P. Duteil M. Gouanère A. V. Inyakin D. B. Kakauridze V. A. Kachanov G. V. Khaustov A. V. Kulik J. P. Lagnaux A. A. Lednev V. A. Maisheev Yu. M. Melnik Yu. V. Mikhailov Th. Mouthuy J. P. Peigneux A. Possoz Yu. D. Prokoshkin Yu. V. Rodnov S. A. Sadovsky P. M. Shagin D. Sillou A. V. Singovsky J. P. Stroot V. P. Sugonyaev 《Zeitschrift fur Physik C Particles and Fields》1984,25(3):225-229
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. 相似文献
7.
F. Binon V. A. Davydov S. V. Donskov J. Dufournaud P. Duteil M. Gouanère A. V. Inyakin V. A. Kachanov D. B. Kakauridze G. V. Khaustov Yu. S. Khodirev A. V. Kulik J. P. Lagnaux A. A. Lednev Yu. V. Mikhailov J. P. Peigneux Yu. D. Prokoshkin Yu. V. Rodnov R. Roosen S. A. Sadovsky A. V. Starzev J. P. Stroot V. P. Sugonyaev A. E. Yakutin 《Zeitschrift fur Physik C Particles and Fields》1981,9(2):109-116
π? p→π0 n 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. 相似文献
8.
D. Alde F. G. Binon C. Bricman S. V. Donskov M. Gouanere A. V. Inyakin V. A. Kachanov D. B. Kakauridze G. V. Khaustov E. A. Knapp A. V. Kulik J. P. Lagnaux A. A. Lednev Yu. V. Mikhailov Th. Mouthuy J. P. Peigneux Yu. D. Prokoshkin Yu. V. Rodnov S. A. Sadovsky V. D. Samoylenko P. M. Shagin A. V. Shtannikov A. V. Singovsky J. P. Stroot V. P. Sugonyaev 《Zeitschrift fur Physik C Particles and Fields》1987,36(4):603-609
The partial widths of the η′(958) decays into 2γ, ωγ, 3π0 andηπ0π0 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 theG-parity violating decayη′→3π0 has been determined. 相似文献
9.
D. Alde R. Bellazzini F. G. Binon M. Boutemeur A. Brez C. Bricman S. V. Donskov M. Gouanère A. V. Inyakin V. A. Kachanov G. V. Khaustov E. A. Knapp A. V. Kulik A. A. Lednev M. M. Massai L. Massonnet J. P. Peigneux Yu. D. Prokoshkin S. A. Sadovsky V. D. Samoylenko P. M. Shagin A. V. Shtannikov A. V. Singovsky J. P. Stroot V. P. Sugonyaev M. R. Torquati 《Zeitschrift fur Physik C Particles and Fields》1989,43(4):541-547
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 0.1F<0.3. 相似文献
10.
A. M. Blik A. M. Gorin S. V. Donskov S. Inaba V. N. Kolosov M. E. Ladygin A. A. Lednev V. A. Lishin I. V. Manuilov Yu. V. Mikhailov V. A. Polyakov V. D. Samoylenko A. E. Sobol V. P. Sugonyaev K. Takamatsu T. Tsuru G. V. Khaustov 《Physics of Atomic Nuclei》2007,70(4):693-701
Searches for rare and forbidden neutral decays of η mesons are performed at the GAMS-4π facility. A charge-exchange reaction at an initial momentum of 32.5 GeV/c was used as a source of 3.7 × 106 η mesons. The following upper limits are established at a 90% confidence level: Br(η → 3γ) < 1.6 × 10?4, Br(η → 4γ) < 2.8 × 10?4, Br(η → π0π0) < 3.5 × 10?4, Br(η → π0π0γ) < 1.7 × 10?3, Br(η → π0π0γγ) < 4.0 × 10?3, Br(η → 3π0γ) < 2.4 × 10?4, and Br(η → 4π0) < 2.0 × 10?5. 相似文献