Observation of the radiative kaon decay K
? → µ?π0γν |
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Authors: | 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 |
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Institution: | (1) Institute for High Energy Physics, Protvino, Moscow oblast, 142284, Russia;(2) Institute for Nuclear Research, Russian Academy of Sciences, pr. Shestidesyatiletiya Oktyabrya 7a, Moscow, 117312, Russia |
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Abstract: | 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. |
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Keywords: | |
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