暗物质及中微子质量的三圈图产生模型

发布时间：2018-04-02 16:27

本文选题：中微子质量　切入点：圈图辐射修正　出处：《南京师范大学》2015年硕士论文

【摘要】：中微子质量和宇宙暗物质被认为是超出标准模型的两个可能信号,在本论文中我们考虑一个新的模型,在标准模型粒子之外增加了一个带电的标量单态,一个超荷为0的标量三重态,还有两个Majorana单态费米子,通过引入分立的Z2对称性保证中微子的质量只能在三圈水平上才能出现,很自然地产生极小的中微子质量,而且较轻的单态Majorana费米子是稳定的,可以成为暗物质的候选者。我们计算了模型中的中微子质量、轻子味破坏过程以及暗物质relic density,发现存在合理的参数空间符合相关的各种实验结果,还预言最轻的中微子质量为零,暗物质的质量在50 GeV到135 GeV左右,它与轻子之间的、'ukawa耦合也相当可观,因此可以在未来的正负电子对撞机上进行寻找。此外,如果模型中的Yukawa耦合系数是复的,还可以在单圈图水平上实现衰变N2→N1γ,从而解释2014年在不少星系团中发现的3.55 keV X谱线。
[Abstract]:Neutrino mass and cosmic dark matter are considered to be two possible signals beyond the standard model. In this paper we consider a new model in which a charged scalar single state is added to the standard model particle.A scalar triplet with a supercharge of 0, and two Majorana monomorphic fermions, by introducing a discrete Z2 symmetry to ensure that the mass of the neutrino can only occur at a three-cycle level, resulting naturally in a minimal neutrino mass.And the lighter monomorphic Majorana fermions are stable and can be candidates for dark matter.We have calculated the neutrino mass, the process of lepton taste destruction and the dark matter relic density in the model. We have found that there are reasonable parameter spaces in accordance with the relevant experimental results, and predicted that the lightest neutrino mass is zero.The mass of dark matter is about 50 GeV to 135 GeV, and the coupling between dark matter and lepton is considerable, so it can be looked for on positron and negative electron collider in the future.In addition, if the Yukawa coupling coefficient in the model is complex, the decay N _ 2 N _ 1 纬 can be realized at the level of unicyclic graph, thus explaining the 3.55 keV X line found in many clusters of galaxies in 2014.
【学位授予单位】：南京师范大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P145.9;O572.321

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