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Phenomenological Studies of the Minimal Supersymmetric Standard Model and the Extensions.

最小超对称标准模型及其扩展的现象学研究。

基本信息

批准号：
15540255
负责人：
HISANO Junji
金额：
$ 2.37万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2006
项目状态：
已结题

项目摘要

The supersymmetric standard model (SUSY SM) is one of the well-motivated models beyond the standard model of particle physics. This model predicts a stable SUSY particle due to stability of proton, and it is a candidate of the dark matter in the Universe. This model is also compatible with the Grand Unified Theories (GUTs). The electroweak precision tests prefer the light Higgs boson. Now many researchers are studying this model and expect it to be discovered in near future. We studied phenomenology of this model.One of our researches is theoretical studies of detection of the neutralino dark matter. The lightest neutralino is a well-motivated dark matter candidate in the SUSY SM. Traditional direct detection of the neutralino dark matter uses the elastic scattering with nucleus. We evaluated the radiative correction to the process, and found that the cross sections have lower bounds when the neutralino is wino-like or Higgsino-like. We also discussed a possibility of detection of the … More dark matter using electron strage ring. This method might work when the neutralino and selectron have a tiny mass difference. We also considered the indirect detection, which is observation of anomalous cosmic rays produced by the neutralino annihilation in the Universe. We found that the non-perturbative effect by the electroweak interaction is not non-negligible in the annihilation cross section when the neutralino has weak charge, such as in cases of the wino-like or Higgsino-like neutralino.The squark and slepton mass terms may violate the flavor symmetries, and the flavor changing neutral current (FCNC) processes are predicted in the SUSY SM. The processes are sensitive to physics of origin of the SUSY breaking and also models beyond the SUSY SM, such origin of the neutrino masses and SUSY GUTs. We discussed hadronic and leptonic lectric dipole moments induced by the flavor violation in the squark and slepton mass terms. We found that they have higher sensitivities than FCNC processes, depending on the parameters of the models. We also discussed prospects of future EDM experiments from a point of view of the SUSY GUTs. Less

超对称标准模型（SUSY SM）是粒子物理标准模型之外的良好驱动模型之一。由于质子的稳定性，该模型预测了一个稳定的超对称性粒子，它是宇宙暗物质的候选者。该模型也与大统一理论（GUTs）兼容。电弱精度测试更倾向于轻希格斯玻色子。现在许多研究人员正在研究这个模型，并期望在不久的将来发现它。我们研究了这个模型的现象学。我们的研究之一是探测中性微子暗物质的理论研究。最轻的中性微子是超对称性宇宙中一个有充分动机的暗物质候选者。传统的直接探测中性微子暗物质的方法是带核的弹性散射。我们对这一过程进行了辐射校正，发现当中性微子是类窗口或类希格sino时，截面有下界。我们还讨论了利用电子奇异环探测更多暗物质的可能性。当中性微子和选择电子有微小的质量差时，这种方法可能有效。我们还考虑了间接探测，即观测宇宙中中微子湮灭产生的异常宇宙射线。我们发现电弱相互作用的非微扰效应在中和子带弱电荷时并非不可忽略，例如在类wino或类higgsino的中和子中。夸克和睡眠质量项可能会破坏风味对称性，并在SUSY SM中预测了风味变化中性电流（FCNC）过程。这些过程对超对称性破断的起源物理非常敏感，也对超对称性SM之外的模型非常敏感，比如中微子质量的起源和超对称性的GUTs。我们讨论了在夸克质量项和睡眠质量项中由风味破坏引起的强子和轻子电偶极矩。我们发现，根据模型参数的不同，它们比FCNC过程具有更高的灵敏度。我们还从超晶格理论的角度讨论了未来电火花加工实验的前景。少