arXiv 1603.047232016-03hep-ph

接近最小的暗物质和辐射中微子质量

Closing in on minimal dark matter and radiative neutrino masses

D. Aristizabal Sierra, C. Simoes, D. Wegman

备注：: 18 pages, 6 figures, 2 tables. Two diagrams updated, few clarifications and references added. Matches version accepted for publication in JHEP

摘要：

我们研究了单圈辐射中微子质量模型，其中一个超标准模型场是超荷零费米子五重态（最小暗物质）或超荷零标量七重态。通过对所有可能的单圈模型进行系统分类，我们发现了各种过程，这些过程使这些表象（暗物质）的中性成分在宇宙学上不稳定。因此，我们的研究结果表明，这些情况下，一般不调和与暗物质的稳定性，除非微小的耦合或额外的特设对称性假设，在最小的暗物质模型的稳定性完全是由于标准模型规范对称性。对于一些基于高阶循环的变体，我们发现$α_2$在相当低的尺度上达到朗道极点，这与模型本身的特征尺度相差几个数量级。因此，我们认为，这些变化虽然符合暗物质的稳定性和唯象的约束是很难调和的微扰性标准。

英文摘要：

We study one-loop radiative neutrino mass models in which one of the beyond-the-standard model fields is either a hypercharge-zero fermion quintet (minimal dark matter) or a hypercharge-zero scalar septet. By systematically classifying all possible one-loop such models we identify various processes that render the neutral component of these representations (dark matter) cosmologically unstable. Thus, our findings show that these scenarios are in general not reconcilable with dark matter stability unless tiny couplings or additional ad hoc symmetries are assumed, in contrast to minimal dark matter models where stability is entirely due to the standard model gauge symmetry. For some variants based on higher-order loops we find that $α_2$ reaches a Landau pole at rather low scales, a couple orders of magnitude from the characteristic scale of the model itself. Thus, we argue that some of these variations although consistent with dark matter stability and phenomenological constraints are hard to reconcile with perturbativity criteria.

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