Observation of the radiative kaon decay K− → µ−π0γν

被引：0
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作者：
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
机构：
[1] Institute for High Energy Physics,Institute for Nuclear Research
[2] Russian Academy of Sciences,undefined
来源：
Physics of Atomic Nuclei | 2007年 / 70卷
关键词：
13.20.Eb; 13.40.Ks;
D O I：
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中图分类号：
学科分类号：
摘要：
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(Kµ3γ, 5 < E*γ < 30 MeV)/Br(Kµ3) is found to be [0.270 ± 0.029(stat.) ± 0.026(syst.)]% and the ratio Br(Kµ3γ, 30 < E*γ < 60 MeV)/Br(Kµ3) = [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)/mK3 is −0.03 ± 0.13.
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页码：29 / 34
页数：5
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