{"title":"K+ → π0µ+νγ 和 K+ → π0e+νγ 衰变：OKA \"实验的最新结果","authors":"I. S. Tiurin","doi":"10.1134/S1547477124700936","DOIUrl":null,"url":null,"abstract":"<p>The <i>K</i><sup>+</sup> → π<sup>0</sup>µ<sup>+</sup>νγ(<i>K</i><sub>µ3γ</sub>) and <i>K</i><sup>+</sup> → π<sup>0</sup><i>e</i><sup>+</sup>νγ (<i>K</i><sub><i>e</i>3γ</sub>) decays are measured with OKA detector at the RF-separated 17.7 GeV/<i>c</i> momentum kaon beam from the U-70 synchrotron. The data obtained corresponds to the value of 2.62 × 10<sup>10</sup> “live” kaons passing to the decay volume. The ratios of Br(<i>K</i><sub>µ3γ</sub>)/Br(<i>K</i><sub>µ3</sub>) and Br(<i>K</i><sub><i>e</i>3γ</sub>)/Br(<i>K</i><sub><i>e</i>3</sub>) are measured. The T-odd correlation ξ<sub>πμγ</sub> (ξ<sub>π<i>e</i>γ</sub>), which is the mixed product of the momenta of µ<sup>+</sup>(<i>e</i><sup>+</sup>), π<sup>0</sup>, and γ in the kaon rest frame, is measured. The asymmetry of the distribution in ξ is characterized by the ratio <i>A</i><sub>ξ</sub> = (<i>N</i><sub>+</sub> − <i>N</i><sub>−</sub>)/(<i>N</i><sub>+</sub> + <i>N</i><sub>−</sub>), where <i>N</i><sub>+(−)</sub> is the number of events with positive (negative) ξ. The values of <i>A</i><sub>ξ</sub> for <i>K</i><sub>µ3γ</sub> and for <i>K</i><sub><i>e</i>3γ</sub> is obtained.</p>","PeriodicalId":730,"journal":{"name":"Physics of Particles and Nuclei Letters","volume":"21 4","pages":"650 - 653"},"PeriodicalIF":0.4000,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"K+ → π0µ+νγ and K+ → π0e+νγ Decays: Recent Results from the “OKA” Experiment\",\"authors\":\"I. S. Tiurin\",\"doi\":\"10.1134/S1547477124700936\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>The <i>K</i><sup>+</sup> → π<sup>0</sup>µ<sup>+</sup>νγ(<i>K</i><sub>µ3γ</sub>) and <i>K</i><sup>+</sup> → π<sup>0</sup><i>e</i><sup>+</sup>νγ (<i>K</i><sub><i>e</i>3γ</sub>) decays are measured with OKA detector at the RF-separated 17.7 GeV/<i>c</i> momentum kaon beam from the U-70 synchrotron. The data obtained corresponds to the value of 2.62 × 10<sup>10</sup> “live” kaons passing to the decay volume. The ratios of Br(<i>K</i><sub>µ3γ</sub>)/Br(<i>K</i><sub>µ3</sub>) and Br(<i>K</i><sub><i>e</i>3γ</sub>)/Br(<i>K</i><sub><i>e</i>3</sub>) are measured. The T-odd correlation ξ<sub>πμγ</sub> (ξ<sub>π<i>e</i>γ</sub>), which is the mixed product of the momenta of µ<sup>+</sup>(<i>e</i><sup>+</sup>), π<sup>0</sup>, and γ in the kaon rest frame, is measured. The asymmetry of the distribution in ξ is characterized by the ratio <i>A</i><sub>ξ</sub> = (<i>N</i><sub>+</sub> − <i>N</i><sub>−</sub>)/(<i>N</i><sub>+</sub> + <i>N</i><sub>−</sub>), where <i>N</i><sub>+(−)</sub> is the number of events with positive (negative) ξ. The values of <i>A</i><sub>ξ</sub> for <i>K</i><sub>µ3γ</sub> and for <i>K</i><sub><i>e</i>3γ</sub> is obtained.</p>\",\"PeriodicalId\":730,\"journal\":{\"name\":\"Physics of Particles and Nuclei Letters\",\"volume\":\"21 4\",\"pages\":\"650 - 653\"},\"PeriodicalIF\":0.4000,\"publicationDate\":\"2024-08-14\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Physics of Particles and Nuclei Letters\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://link.springer.com/article/10.1134/S1547477124700936\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"PHYSICS, PARTICLES & FIELDS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Physics of Particles and Nuclei Letters","FirstCategoryId":"1085","ListUrlMain":"https://link.springer.com/article/10.1134/S1547477124700936","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"PHYSICS, PARTICLES & FIELDS","Score":null,"Total":0}
K+ → π0µ+νγ and K+ → π0e+νγ Decays: Recent Results from the “OKA” Experiment
The K+ → π0µ+νγ(Kµ3γ) and K+ → π0e+νγ (Ke3γ) 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(Kµ3γ)/Br(Kµ3) and Br(Ke3γ)/Br(Ke3) are measured. The T-odd correlation ξπμγ (ξπeγ), 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 Aξ = (N+ − N−)/(N+ + N−), where N+(−) is the number of events with positive (negative) ξ. The values of Aξ for Kµ3γ and for Ke3γ is obtained.
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.
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