Phenomenology related to neutrino oscillation experiments in the near future

近期中微子振荡实验相关的现象学

• 批准号: 16540260
• 负责人: YASUDA Osamu
• 金额: $ 2.3万
• 依托单位: Tokyo Metropolitan University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16540260/
• 关键词: neutrino oscillation; flavor mixing; neutrino mass; CP violation; parameter degeneracy; reactor neutrino; long baseline neutrino experiments; KASKA experiment; neutrino oscillation; flavor mixing; neutrino mass; CP violation; parameter degeneracy; reactor neutrino; long baseline neutrino experiments; KASKA experiment

(1) In the general case where there are more than one reactor and there are at least one near and one far detectors, sensitivity to sin^2 2θ_<13> was discussed analytically with a rate analysis only. As long as there are one near and one far detectors, the uncertainty due to existence of multiple reactors turns out to be irrelevant. Furthermore, the dependence of sensitivity on the locations of the near and far detectors was discussed numerically by giving the contour plot in the case of the KASKA project. (2) The above analysis was generalized to the case with a spectrum analysis, and it was concluded that even with a spectrum analysis it would be difficult to improve the sensitivity significantly unless the bin-to-bin uncorrelated systematic error becomes very small. (3) It has been known from the results of our research that the sensitivity to θ_<13> is almost determined by the uncorrelated systematic errors and experimental precision is bounded by these factors. To overcome this problem, a new idea was proposed to put multiple detectors at one site. (4) By introducing a new plot in the (sin^2 2θ_<13>, 1/s^223) plane, it was discussed what kind of further experiments would be needed to solve parameter degeneracy after neutrino and anti-neutrino measurements are done at the oscillation maximum at the T2K experiment (from Tokai to Kamioka). (5) It was pointed out that testing deviation from the standard matter effect by long baseline experiments with the baseline more than 1000km would be effective to search for new physics and that it would be possible to obtain signature of new physics at the present and future long baseline experiments. In the process of this discussion, the formalism by Kimura et al.to get the oscillation probabilities was generalized to the case with new physics, and the analytic formula for the oscillation probability was obtained in a nice way.

（1）在一般情况下，只有一个以上的反应器并且至少有一个近距离检测器，对SIN^22θ_<13>的敏感性仅通过速率分析进行了分析讨论。只要有一个附近和一个远处检测器，由于存在多个反应堆而引起的不确定性无关紧要。此外，通过在Kaska项目的情况下给出轮廓图，对近距离检测器位置的敏感性依赖性进行了数值讨论。 （2）上述分析通过频谱分析概括为案例，得出的结论是，即使通过频谱分析，除非bin-to-to-bin不相关的系统误差也很小，否则很难显着提高灵敏度。 （3）从我们的研究结果中知道，对θ_<13>的敏感性几乎取决于不相关的系统误差，实验精度受这些因素结合。为了克服这个问题，提出了一个新想法，将多个探测器放在一个站点上。 （4）通过在（SIN^22θ_<13>，1/s^223）平面中引入一个新图，讨论了在神经元和抗神经元测量后求解参数退化需要什么样的进一步实验。 （5）指出，长期基线实验的测试偏离了标准物质效应，基线超过1000公里将有效搜索新的物理学，并且有可能在当前和未来的长基线实验中获得新物理学的签名。在讨论的过程中，Kimura等人的形式为了使振荡可能性通过新物理学概括为案例，并且以一种不错的方式获得了振荡概率的分析公式。