K+ → π0µ+νγ and K+ → π0e+νγ Decays: Recent Results from the “OKA” Experiment

IF 0.4 Q4 PHYSICS, PARTICLES & FIELDS Physics of Particles and Nuclei Letters Pub Date : 2024-08-14 DOI:10.1134/S1547477124700936

I. S. Tiurin

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Abstract

The K⁺ → π⁰µ⁺νγ(K_µ3γ) and K⁺ → π⁰e⁺νγ (K_e3γ) decays are measured with OKA detector at the RF-separated 17.7 GeV/c momentum kaon beam from the U-70 synchrotron. The data obtained corresponds to the value of 2.62 × 10¹⁰ “live” kaons passing to the decay volume. The ratios of Br(K_µ3γ)/Br(K_µ3) and Br(K_e3γ)/Br(K_e3) are measured. The T-odd correlation ξ_πμγ (ξ_πeγ), which is the mixed product of the momenta of µ⁺(e⁺), π⁰, and γ in the kaon rest frame, is measured. The asymmetry of the distribution in ξ is characterized by the ratio A_ξ = (N₊ − N₋)/(N₊ + N₋), where N₊₍₋₎ is the number of events with positive (negative) ξ. The values of A_ξ for K_µ3γ and for K_e3γ is obtained.

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K+ → π0µ+νγ 和 K+ → π0e+νγ 衰变：OKA "实验的最新结果

用 OKA 探测器在 U-70 同步加速器射频分离的 17.7 GeV/c 动量 kaon 束上测量了 K+ →π0µ+νγ(Kµ3γ) 和 K+ →π0e+νγ (Ke3γ)衰变。所获得的数据与进入衰变体积的 2.62 × 1010 个 "活 "高子值相对应。测量了 Br(Kµ3γ)/Br(Kµ3)和 Br(Ke3γ)/Br(Ke3)的比率。测量了 Todd 相关性ξπμγ（ξπeγ），它是高子静止帧中µ+(e+)、π0 和 γ 的矩的混合乘积。ξ分布的不对称性用比率 Aξ = (N+ - N-)/(N+ + N-)来表征，其中 N+(-) 是ξ为正（负）的事件数。得出 Kµ3γ 和 Ke3γ 的 Aξ 值。

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来源期刊

Physics of Particles and Nuclei Letters PHYSICS, PARTICLES & FIELDS-

CiteScore

0.80

自引率

20.00%

发文量

108

期刊介绍： The journal Physics of Particles and Nuclei Letters, brief name Particles and Nuclei Letters, publishes the articles with results of the original theoretical, experimental, scientific-technical, methodological and applied research. Subject matter of articles covers: theoretical physics, elementary particle physics, relativistic nuclear physics, nuclear physics and related problems in other branches of physics, neutron physics, condensed matter physics, physics and engineering at low temperatures, physics and engineering of accelerators, physical experimental instruments and methods, physical computation experiments, applied research in these branches of physics and radiology, ecology and nuclear medicine.