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

1.我们已经提出了一个具体的设置为确定CP破坏相和中微子质量等级，称为东海到神冈-韩国（T2 KK），其中一个强中微子束从位于东海村的J-PARC被接收的两个相同的探测器，一个放置在神冈和其他在韩国与每0.5兆吨水。我们已经证明T2 KK可以解决八重参数退化问题，并且可以确定MNS矩阵的所有未知元素，其精度可以与国际上提出的其他项目（例如，中微子工厂，只要混合角theta_13存在于下一代长基线实验，如T2 K（东海到神冈）的灵敏度范围内。为实现这一设想，2005年和2006年在韩国首尔举办了两次国际讲习班。T2 KK被认为是未来T2 K项目的良好候选者之一。并提出了对保护主义的理论认识 ...更多信息 通过揭示称为“简并之间的解耦”的性质，这意味着每两对简并可以独立于其他简并的存在而被解析。2003年，我们提出了用两个探测器设置的远近相同作为θ_13的纯测量来测量θ_13的反应堆实验的想法。我们建议用反应堆-加速器联合方法解决θ_23简并度。基于这一想法，并与两个T2 K实验学家合作，我们已经详细研究了解决theta_23简并度的灵敏度，可以通过该方法实现。结果表明，在θ_13，sin~2 2 θ_13> 0.5-0.6.3的较大范围内，该方法对θ_23简并度的分辨能力优于目前提出的其它方法。首席研究员（与阿列克谢·斯米尔诺夫）提出了一个新的概念，称为“夸克-轻子互补”（QLC），基于实验数据给出的提示，即卡比博角和太阳角加起来等于ji/4。这可能意味着对夸克和轻子如何统一的问题的一种新的方法。我们已经构建了一些关于QLC如何嵌入大统一理论的具体场景，并提出了如何通过实验来测试它们。它们都包含一个新的特征，即在轻子味混合的（1-2）扇区中存在最大角。少

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