排序方式: 共有6条查询结果,搜索用时 15 毫秒
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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
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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
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Burtovoy V. S. Akimenko S. A. Artamonov A. V. Blik A. M. Brekhovskikh V. V. Gorin A. M. Donskov S. V. Inyakin A. V. Kolosov V. N. Kurshetsov V. F. Lishin V. A. Medynsky M. V. Mikhailov Yu. V. Obraztsov V. F. Polyakov V. A. Romanovsky V. I. Rykalin V. I. Sadovsky A. S. Samoilenko V. D. Stenyakin O. V. Uvarov V. A. Filin A. P. Khaustov G. V. Kholodenko S. A. Tchikilev O. G. Yushchenko O. P. Guschin E. N. Duk V. A. Kravtsov V. I. Kudenko Yu. G. Polyarush A. Yu. Filippov S. N. Khudyakov A. A. Bychkov V. N. Zalikhanov B. Zh. Kekelidze G. D. Lysan V. M. 《Journal of Experimental and Theoretical Physics》2020,131(6):928-939
Journal of Experimental and Theoretical Physics - On the statistics of ~1.7 × 108 interactions of positively charged kaons on copper nuclei, coherent events of the K+π0 system production... 相似文献
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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
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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》2009,72(2):231-236
The parameters of the Dalitz diagram for the decay η′ → ηπ 0 π 0 in a generalized and a linear representation were determined by using a statistical sample of 15 × 103 events. A charge-exchange reaction at a momentum of 32 GeV/c was a source of monoenergetic η′ mesons. The experiment was performed with the aid of the GAMS-4π spectrometer. 相似文献
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O. P. Yushchenko V. F. Kurshetsov A. P. Filin S. A. Akimenko A. V. Artamonov A. M. Blik V. V. Brekhovskikh V. S. Burtovoy S. V. Donskov A. V. Inyakin A. M. Gorin G. V. Khaustov S. A. Kholodenko V. N. Kolosov A. S. Konstantinov V. M. Leontiev V. A. Lishin M. V. Medynsky Yu. V. Mikhailov V. F. Obraztsov V. A. Polyakov A. V. Popov V. I. Romanovsky V. I. Rykalin A. S. Sadovsky V. D. Samoilenko V. K. Semenov O. V. Stenyakin O. G. Tchikilev V. A. Uvarov V. A. Duk S. N. Filippov E. N. Guschin Yu. G. Kudenko A. A. Khudyakov V. I. Kravtsov A. Yu. Polyarush V. N. Bychkov G. D. Kekelidze V. M. Lysan B. Zh. Zalikhanov 《JETP Letters》2018,107(3):139-142
Recent results from OKA setup concerning form factor studies in Ke3 decay are presented. About 5.25 M events obtained for decays of 17.7 GeV/cK+ are selected for the analysis. The linear and quadratic slopes for the decay form factor f+(t) are measured: λ'+ = 2.95 ± 0.022 ± 0.018 × 10 -2 for the linear slope fit and λ+ = 2.611 ± 0.035 ± 0.028 × 10 -2, λ"+ = 1.91 ± 0.19 ± 0.14 × 10 -3 for the quadratic one. The scalar and tensor contributions are compatible with zero. Several alternative parametrizations are tried: the Pole fit parameter is found to be M V = 891 ± 3 MeV; the parameter of the dispersive parametrization is measured to be Λ+ = 2.458 ± 0.018 × 10-2. 相似文献
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