Research in Particle and Accelerator Physics at KEK

魅力物理是风味物理领域的重要组成部分。这一领域目前正处于复兴时期，世界各地的许多实验设施，包括b工厂、强子对撞机和Charm工厂，都取得了重要的测量结果。风味物理的一个重要目标是确定Cabibbo Kobayashi Maskawa （CKM）混合矩阵的所有元素，这是一个涉及六种已知风味（或类型）夸克的电弱相互作用的复数矩阵。韦恩州立大学的研究小组对中性粲D介子在CLEO-c上的混合研究做出了重大贡献。在他们的测量中，值得注意的是提取了一个重要的参数，即中性D介子衰变到包含带电介子和介子的最终态时的强相。这一测量对测量一种称为伽马的CKM混合角有影响。该小组计划在日本KEK继续使用BELLE-II研究D衰变，并正在探索D衰变中CP破坏的新测试。此外，在BELLE-II上，该小组打算研究罕见的D介子衰变，寻找4夸克的含量，并建立在CLEO-c上早期获得的专业知识。通过REU/RET项目，该组织的更广泛影响是相当大的，接触到直接参与研究项目的代表性不足群体的学生。

Charm physics is an important component of the field of flavor physics. This field is currently in a renaissance with significant results coming from measurements at a number of experimental facilities worldwide, including B-factories, Hadron Colliders, and Charm factories. An important objective in flavor physics is the determination of all of the elements of the Cabibbo Kobayashi Maskawa (CKM) mixing matrix, which is a matrix of complex numbers that relates the electroweak interactions of the six known flavors (or types) of quarks. The Wayne State University group has made significant contributions to the study of the mixing of neutral charm D mesons at CLEO-c. Notable among their measurements is the extraction of an important parameter known as the strong phase in decays of neutral D mesons into final states containing charged Kaons and Pions. This measurement has impact on the determination of one of the CKM mixing angles called gamma. The group plans to continue the study of D decays with BELLE-II at KEK in Japan and is exploring a new test of CP violation in D decays. Additionally at BELLE-II, the group intends to study rare decays of D mesons, looking for 4 quark content, and building upon earlier expertise gained at CLEO-c. The broader impacts efforts of the group are considerable through REU/RET programs, reaching students from underrepresented groups who participate directly in the research program.