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1.
S. A. Akimenko V. N. Bolotov G. I. Britvich K. V. Datsko V. A. Duk A. P. Filin E. N. Gushchin A. V. Inyakin V. A. Khmelnikov A. S. Konstantinov V. F. Konstantinov I. Yu. Korolkov S. V. Laptev V. A. Lebedev V. M. Leontiev A. E. Mazurov V. P. Novikov V. F. Obraztsov V. A. Polyakov A. Yu. Polyarush V. E. Postoev V. I. Romanovsky V. I. Shelikhov O. G. Tchikilev V. A. Uvarov O. P. Yushchenko 《Physics of Atomic Nuclei》2007,70(4):702-708
Results of study of the $K^ - \to \pi ^0 e^ - \overline \nu \gamma $ decay at the ISTRA+ setup are presented. We observed 4476 events of this decay. The branching ratio is found to be $R = \frac{{Br(K^ - \to \pi ^0 e^ - \overline \nu _e \gamma )}}{{Br(K^ - \to \pi ^0 e^ - \overline \nu _e )}}$ = (1.81±0.03(stat.)±0.07(syst.)) × 10?2 for E*γ > 10 MeV and θ*eγ > 10°. For comparison with the previous experiment the branching ratio with cuts E*γ > 10 MeV, 0.6 < cos θ*eγ < 0.9 is calculated: R = $\frac{{Br(K^ - \to \pi ^0 e^ - \overline \nu _e \gamma )}}{{Br(K^ - \to \pi ^0 e^ - \overline \nu _e )}}$ = (0.47±0.02(stat.) ± 0.03(syst.)) × 10?2. For the cuts E*γ > 30 MeV and θ*eγ > 20°, used in most theoretical papers, Br = (3.06 ± 0.09(stat.) ± 0.14(syst.)) × 10?4. For the asymmetry we get A ξ = ?0.015 ± 0.021. At present it is the best estimate of this asymmetry. 相似文献
2.
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
3.
W.D. Apel K.H. Augenstein E. Bertolucci S.V. Donskov A.V. Inyakin V.A. Kachanov R.N. Krasnokutsky M. Kruger G. Leder A.A. Lednev I. Mannelli Yu.V. Mikhailov H. Müller G.M. Pierazzini Yu.D. Prokoshkin M. Quaglia H. Schneider A. Scribano M.L. Vincelli 《Physics letters. [Part B]》1978,72(4):500-502
The invariant mass spectrum of neutral final states produced in π?p charge-exchange scattering at 40 GeV/c has been studied, searching for heavy particles decaying in 2γ. A peak is observed around 2.85 GeV/c2. The cross section of the reaction π?p→X(2.85)+n, times the branching ratio of the X→2γ decay, is measured to be . 相似文献
4.
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
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.
O. G. Tchikilev S. A. Akimenko G. I. Britvich K. V. Datsko A. P. Filin A. V. Inyakin V. A. Khmelnikov A. S. Konstantinov I. Ya. Korolkov V. M. Leontiev V. P. Novikov V. F. Obraztsov V. A. Polyakov V. I. Romanovsky V. I. Shelikhov V. A. Uvarov O. P. Yushchenko V. N. Bolotov S. V. Laptev V. A. Duk A. Yu. Polyarush 《Physics of Atomic Nuclei》2007,70(1):29-34
Using data collected with the ISTRA+ spectrometer during the 2001 run of the U-70 proton synchrotron in Protvino, the first
observation of the radiative kaon decay K
− → μ−π0γν is reported. The ratio Br(K
μ3γ, 5 < E*γ < 30 MeV)/Br(K
μ3) is found to be [0.270 ± 0.029(stat.) ± 0.026(syst.)]% and the ratio Br(K
μ3γ, 30 < E*γ < 60 MeV)/Br(K
μ3) = [0.0448 ± 0.0068(stat.) ± 0.0099(syst.)]%. These ratios are consistent with the theoretical predictions 0.21 and 0.047%,
respectively. The measured angular distribution asymmetry for the region 5 < E*γ < 30 MeV, A(cos ϑ*μγ) = 0.093 ± 0.141, is two standard deviations away from the theoretical prediction of 0.354. The measured asymmetry in the
T-odd variable ξ = pγ · (pμ × pπ)/m
K
3
is −0.03 ± 0.13.
The text was submitted by the authors in English. 相似文献
7.
I. V. Ajinenko S. A. Akimenko G. A. Akopdzhanov K. S. Belous G. I. Britvich I. G. Britvich A. P. Filin V. N. Govorun A. V. Inyakin V. A. Khmelnikov A. S. Konstantinov V. F. Konstantinov I. Ya. Korolkov V. M. Leontiev V. P. Novikov V. F. Obraztsov V. A. Polyakov V. I. Romanovsky V. M. Ronjin V. A. Senko N. A. Shalanda M. M. Shapkin V. I. Shelikhov N. E. Smirnov A. A. Sokolov O. G. Tchikilev E. V. Vlasov O. P. Yushchenko V. N. Bolotov S. V. Laptev A. Yu. Polyarush V. E. Postoev S. V. Yashchenko B. Zh. Zalikhanov V. Z. Serdyuk 《Physics of Atomic Nuclei》2002,65(11):2064-2069
The decay K ? → e ? νπ 0 has been studied using in-flight decays detected with the ISTRA+ setup working at the 25-GeV negative secondary beam of the U-70 PS. About 130K events were used for the analysis. The λ + parameter of the vector form factor has been measured: λ +=0.0293±0.0015(stat.)±0.002(syst.). The limits on the possible tensor and scalar couplings have been derived: f T/f +(0)=?0.045±0.060(stat.) and f S/f +(0)=?0.019 ?0.016 +0.025 (stat.). 相似文献
8.
V. A. Uvarov S. A. Akimenko V. N. Bolotov G. I. Britvich V. A. Duk A. P. Filin A. V. Inyakin S. A. Kholodenko A. A. Khudyakov A. S. Konstantinov V. F. Konstantinov V. M. Leontiev A. I. Makarov V. F. Obraztsov V. A. Polyakov A. Yu. Polyarush A. V. Popov V. I. Romanovsky O. V. Stenyakin O. G. Tchikilev O. P. Yushchenko 《Physics of Atomic Nuclei》2014,77(6):725-732
The ratio of branching fractions for \(K^ - \to e^ - \bar \nu _e \pi ^0\) andK ? → π?π0 decays has been measured using the ISTRA+ spectrometer. The result of our measurement is the following: $$\mathcal{R}_{Ke_3 /K_{2\pi } } = 0.2423 \pm 0.0015(stat.) \pm 0.0037(syst.).$$ Using the current PDG value for the K 2π branching fraction, this result leads to the measured K e3 branching fraction of Br(K e3) = 0.0501 ± 0.0009 and to the value of |V us |f +(0) = 0.2115 ± 0.0021. 相似文献
9.
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
10.
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