Generation Structure and Lepton Flavor Violation in Supersymmetric Theories

在粒子物理标准模型的超对称推广中研究了轻子味破坏。比较了轻子扇味破坏与夸克扇味破坏的异同，指出了轻子扇味破坏更有发现潜力的超粒子质谱。与此相关，提出了一种新的超对称破缺和调解机制，这可能是弦理论的低能结果。指出模衰变为引力子对的分支比相当大，并讨论了它的宇宙学意义。

Lepton flavor violation is studied in the supersymmetric extension of the standard model of particle physics. We compare the lepton sector flavor violation with that of quark sector, and identify the superparticle mass spectrum in which the lepton flavor gives better discovery potential. Related to this, a new mechanism of supersymmetry breaking and mediation is proposed, which can be a low-energy consequence of string theories. It is pointed out that the moduli decay into gravitino pairs has a sizable branching ratio, and its cosmological implications are discussed.