Search for ν_μ→ν_τ oscillation

搜索ν_μ→ν_τ振荡

• 批准号: 11694070
• 负责人: NIWA Kimio
• 金额: $ 6.59万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11694070/
• 关键词: Nuclear; Neutrino; Elementary particle; Emulsion; Dark matter; ECC; タウニュートリノ; 原子核乾板; 素粒子標準模型; クォーク・レプトン; ニュートリノ振動

During the years 1994-1997,the emulsion target of the CHORUS detector was exposed to the wide band neutrino Beam from the CERN-SPS. About 170000 neutrino interactions were successfully located in the emulsion. Improvements in the automatic emulsion scanning systems and application of different criteria allowed the sample of located events to used for studies of charm production. We present a measurement of the production rate of D0 measons based on a sample of 25693 located nyu・mu charged・current(CC)interactions analyzed sofar. After reconstruction of the event topology in the vertex region,283 D0 decays were observed with an estimated background of 9.2K0 and Λ decays. The ratio of cross・section of D0 production and nyu・mu CC interactions is found to be(l.99+・9.13(stat.)+・0.17(syst.))^*10・2 at 27GeV average nyu・mu energy.

1994-1997年，将CHORUS探测器的乳剂靶暴露在CERN-SPS的宽带中微子束中。在乳剂中成功定位了约17万个中微子相互作用。自动乳剂扫描系统的改进和不同标准的应用允许将定位事件的样本用于魅力生产的研究。我们提出了一种基于25693个位于nyu·mu电荷·电流（CC）相互作用的样品的D0介子产生速率的测量方法。在顶点区域重建事件拓扑后，观测到283次D0衰减，估计背景为9.2K0，衰减为Λ。D0产生和nyu·mu CC相互作用的截面比为(1.99 +·9.13(stat.)+·0.17（syst.）。)^*10·2在27GeV时平均nyu·mu能量。

项目成果

S,Eskut: "Observation of weak neutral current neutrino production of J/Ψ"Phys.Letter B. (in press).

S,Eskut：“J/Ψ 弱中微子产生的观察”Phys.Letter B.（出版中）。

Niwa Kimio: "Tau neutrino which was taken at last"Nikkei Science. 29 ・ 10. 88-97 (1999)

丹羽公男：“最终拍摄到的 τ 中微子”《日经科学》29·10.88-97（1999）

E.Eskut, et al.: "Observation of Weak Neutral Current Neutrino Production of J/ψ"Phys.Lett.B. 503. 1-9 (2001)

E.Eskut 等人：“J/ψ 弱中微子产生的观察”Phys.Lett.B. 503. 1-9 (2001)

K.Niwa: "Nuclear emulsion in a large hybird expriment(CHORUS)to search for ν_μ→ν_τ oscillations"Nuclear. Inst. Method. A447. 361-376 (2000)

K.Niwa：“大型混合实验（CHORUS）中寻找 ν_μ→ν_τ 振荡”核研究所方法。

丹羽 公雄: "タウニュートリノ直接検出"パリティ. 12月号. 16-18 (2000)

Kimio Niwa：“直接检测 tau 中微子”Parity 12 月 16-18 号。