Institute for High Energy Physics, Protvino, Russia.

V. N. Bolotov, N. Guschin, V. A. Duk, S. V. Laptev,V. A. Lebedev, A. E. Mazurov,A. Yu. Polyarush, V. E. Postoev,S. A. Akimenko, G. I. Britvich, K. V. Datsko, A. P. Filin,A. V. Inyakin,V. F. Konstantinov,A. S. Konstantinov, I. Y. Korolkov, V. A. Khmelnikov,V. M. Leontiev,V. P. Novikov, V. F. Obraztsov,V. A. Polyakov, V. I. Romanovsky, V. I. Shelikhov,O. G. Tchikilev,V. A. Uvarov,O. P. Yushchenko

semanticscholar（2008）

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摘要

Results of the study of the K− → π0e−νγ decay at ISTRA+ setup are presented. 4476 events of this decay have been observed. The ratio of branching rati os (R), R = Br(K −→π0e−νeγ) Br(K−→π0e−νe) = (1.81± 0.03(stat.)± 0.07(syst.))× 10−2, has been obtained for E∗ γ > 10 MeV andθ ∗ eγ > 10◦. For comparison with previous experiments, the branching ra tio with cutsE∗ γ > 10 MeV, 0.6 < cosθ ∗ eγ < 0.9 is calculated,R = Br(K−→π0e−νeγ) Br(K−→π0e−νe) = (0.47± 0.02(stat.) ± 0.03(syst.)) × 10 −2. For the cutsE∗(γ) > 30 MeV andθ ∗ eγ > 20◦, used in most theoretical papers, we have obtained Br(K− → π0e−νeγ) = (3.13± 0.09± 0.14) × 10−4. For the asymmetryAξ we get Aξ = −0.015±0.021. At present it is the best estimate of this asymmetry.

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