White Star Production by pi-Meson in Nuclear Emulsion

核乳液中π介子的白星生产

• 批准号: 07454055
• 负责人: OKUSAWA Toru
• 金额: $ 5.18万
• 依托单位: OSAKA CITY UNIVERSITY,FACUTY OF SCIENCE
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07454055/
• 关键词: White Star; Neutrino Oscillation; Tau Neutrino; Nuclear Emulsion

In this investigation, the purpose is a study of white star production features in nuclear emulsion. We are performing the neutrino oscillation experiment between muon-neutrino and tau-neutrino by using nuclear emulsion and counter hybrid system in CERN.The signal to be obtained, is tau particle which main decay topology is very short kink and which is produced in charged current interaction with nuclear emulsion by tau neutrino oscillated from muon neutrino. In principle, we can not distiguish between tau kink decay and kink like white star process produced by pion in usual neutral current interacion. Therefore, this rises as background and it is necessitated to know the white kink process probability in completion our neutrino oscillation experiment.During the 2 year term from FY1995 through FY1996, the investigation titled as "White Star Production by pi-Meson in Nuclear Emulsion" was supported in category of "Grant-in-Aid for Scientific Research (B) (2)" by The Ministry of Educatio … More n, Science, Sports and Culture. This investigation results have been reported here.The followings are time sequential item of progress in FY1995, FY1996 ;(FY1995)(1) The nuclear emulsion shape, thickness, the number of plates needed were decided by fabricating test modules exposed on beam.(2) The nuclear emulsion holder was designed and fabricated, which is used to fix the emulsion plates relatively in a exposure and keep the beam density to be constant.(3) The emulsion holder mensioned above was assembled with Silicon Strip Detectors and other counter componets and surveyed the relative positions.(4) THe emulsion holder assembly was tested by connecting with data taking circuits and necessitating software developement was completed in same time.(FY1996)(5) The emulsion-counter system was exposed on negative pion in KEK.(6) After exposure, all amulsion plates are developped and preparation of measurement by automatic scanner was completed.The global situation of measurement is very smooth but there appeare some new probiems in detail i.e. very complicated operation and function of measuring apparatus are needed. By these reasons, the completetion of measrement and analysis in this fiscal year becomes to be impossible. But at present, the preliminary results concerned to initial purpose has been obtained and in several months the measurement and analysis is planned to be finished comletely. Less

本次研究的目的是研究核乳剂中白星的产生特征。我们正在欧洲核子研究中心利用核乳剂和反混合系统进行μ中微子和τ中微子之间的中微子振荡实验。获得的信号是τ粒子，其主要衰变拓扑是非常短的扭结，是由μ中微子振荡的τ中微子在带电电流与核乳剂相互作用中产生的。原则上，我们无法区分tau扭结衰变和通常中性电流相互作用中π介子产生的扭结状白星过程。因此，这是背景，有必要了解完成中微子振荡实验时的白色扭结过程概率。在从 1995 财年到 1996 财年的 2 年期间，题为“核乳剂中 pi 介子产生白星”的研究得到了教育部“科学研究援助资助 (B) (2)”类别的支持……更多 n, 科学、体育和 文化。本次调查结果已报道如下。 以下是 1995 财年、1996 财年按时间顺序取得的进展；（1995 财年）（1）核乳剂形状、厚度、所需板的数量通过制作在束流上曝光的测试模块来决定。（2）设计和制造了核乳剂支架，用于将乳剂板相对固定在曝光中并保持束流密度为 (3)将上述乳剂支架与硅片检测器和其他计数器组件组装在一起，并测量相对位置。(4)通过与数据采集电路连接来测试乳剂支架组件，并同时完成必要的软件开发。(FY1996)(5)将乳剂计数器系统暴露在KEK中的负介子上。(6)暴露后，所有乳剂 开发了板材，完成了自动扫描仪测量的准备。总体测量情况很顺利，但在细节上出现了一些新问题，即需要非常复杂的测量设备的操作和功能。由于这些原因，本会计年度的计量分析工作不可能完成。但目前，已经获得了与初步目的相关的初步结果，计划在几个月内完成测量和分析。较少的

项目成果

K. Kodama et. al.: "Measurement of B (D^+_s→μ^+ν_μ)/B (D^+_s→φμ^+ν_μ) and determanation of the decay constant f_<Ds>" Physics Letters. B382巻,3号. 299-304 (1996)

K. Kodama 等人：“B (D^+_s→μ^+ν_μ)/B (D^+_s→φμ^+ν_μ) 的测量和衰减常数 f_<Ds> 的测定”《物理快报》。 B382 卷，第 3 期。299-304 (1996)

K.Kodama et.al.: "Measurement of B(D^+_s→μ^+ν_μ)/B(D^+_s→φμ^+ν_μ)and determination of the decay constant f_<Ds>" Physics Letters. B382巻,3号. 299-304 (1996)

K. Kodama 等人：“B(D^+_s→μ^+ν_μ)/B(D^+_s→φμ^+ν_μ) 的测量和衰减常数 f_<Ds> 的确定”《物理快报》。 B382 卷，第 3 期。299-304 (1996)

K.Kodama et.al.: "Measurement of B(D^+_3*mu^+nu_<mu>)/B(D^+_3*phipi^+nu_<pi>) and determination of the decay constant fo_3" Phys. Lett.B382, No.3. 299-304 (1996)

K.Kodama 等人：“B(D^ _3*mu^ nu_<mu>)/B(D^ _3*phipi^ nu_<pi>) 的测量和衰减常数 fo_3 的确定” Phys。