Investigation of Neutrino Oscillation Phenomena toward Determination of Structure of Lepton Flavor Mixing

中微子振荡现象对轻子风味混合结构测定的研究

基本信息

批准号：
16340078
负责人：
MINAKATA Hisakazu
金额：
$ 8.58万
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 (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16340078/
关键词：
Neutrino oscillation Flavor mixing Hierarchy of neutrino masses CP violation MSW mechanism Non-standard neutrino interactions Long-baseline neutrino experiments Reactor neutrino experiments CP非共存 MSW機構超新星ニュートリノ CPT対称性ニュートリノ質量パ

项目摘要

1. We have proposed a concrete setting for determination of CP violating phase and neutrino mass hierarchy, called the Tokai to Kamioka-Korea (T2KK), in which an intense neutrino beam from J-PARC located in Tokai village is received by the identical two detectors, one placed in Kamioka and the other in Korea with each 0.5 megaton water. We have shown that T2KK can resolve the eight-fold parameter degeneracy and can determine all the unknown elements of MNS matrix to the accuracy comparable to those achieved by other project proposed in the world, e.g., the neutrino factory, as far as the mixing angle theta_13 exists within the region of sensitivity of the next generation long-baseline experiments such as T2K (Tokai-to-Kamioka). Toward the realization of this idea, the two international workshops were held in Seoul, Korea, in 2005 and 2006. T2KK is considered to be one of the good candidates for future project beyond T2K. We have also put forward the theoretical understanding of the pro … More perty of parameter degeneracy by uncovering the property called "decoupling between the degeneracies" which implies that each two pair of the degeneracies can be resolved independent of the presence of the other degeneracies.2. In 2003 wo have proposed idea of reactor experiments for measuring theta_13 by using the near-far identical two detector setting as a pure measurement of theta_13. We then suggested that the theta_23 degeneracy can be resolved by the reactor-accelerator combined method. Based on this idea and in collaboration with the two T2K experimentalists, we have examined in detail the sensitivity of resolving the theta_23 degeneracy that can be achieved by the method. The results indicates that the resolving power of the theta_23 degeneracy by this method is greater than any other methods proposed so far in region of relatively large theta_13, sin~2 2theta_13 > 0.5-0.6.3. The head investigator proposed (with Alexei Smirnov) the new concept called the "quark-lepton complementarity" (QLC) based on a hint given by experimental data that the Cabibbo angle and the solar angles add up to ji/4. It may imply a new approach to the problem of how quarks and leptons are unified. We have constructed some concrete scenarios on how QLC can be embedded into grand unified theories, and proposed how they can be tested experimentally. All of them involve a novel feature that there is the maximal angle in the (1-2) sector of the lepton flavor mixing. Less

1. 我们提出了一种确定 CP 破坏相和中微子质量等级的具体设置，称为 Tokai 到 Kamioka-Korea (T2KK)，其中来自位于 Tokai 村 J-PARC 的强中微子束被相同的两个中微子接收。探测器，一个放置在神冈，另一个放置在韩国，每个探测器放置 0.5 兆吨水。我们已经证明，T2KK 可以解决八倍参数简并性，并可以确定所有未知元素。只要混合角 theta_13 存在于下一代长基线实验（例如 T2K（Tokai-为了实现这一想法，两次国际研讨会分别于2005年和2006年在韩国首尔举行。T2KK被认为是未来的良好候选者之一我们还通过揭示“简并之间的解耦”这一性质，提出了对参数简并性质的理论理解，这意味着每两对简并都可以独立于参数简并的存在而被解析。 2. 2003年，我提出了通过使用近远相同的两个探测器设置作为theta_13的纯粹测量来测量theta_13的反应堆实验的想法。提出可以通过反应堆-加速器组合方法来解决theta_23简并性，基于这个想法，我们与两位T2K实验者合作，详细检验了该方法可以实现的解决theta_23简并性的灵敏度。表明在相对较大的 theta_13、sin~2 区域，该方法对 theta_23 简并性的分辨能力大于迄今为止提出的任何其他方法2theta_13 > 0.5-0.6.3 首席研究员（与 Alexei Smirnov）基于卡比博角和太阳角之和的实验数据给出的暗示，提出了称为“夸克-轻子互补性”（QLC）的新概念。 ji/4。这可能意味着夸克和轻子如何统一的问题的新方法，我们构建了一些关于如何将 QLC 嵌入到大统一理论中的具体方案，并提出了建议。如何通过实验测试它们都涉及一个新特征，即轻子风味混合的 (1-2) 部分存在最大角度。