论文标题

在轻度无菌中微子模型中,真空稳定性和自发违反Lepton数量的低能尺度。

Vacuum stability and spontaneous violation of the lepton number at low energy scale in a model for light sterile neutrinos

论文作者

Pinheiro, João Paulo, Pires, C. A. de S.

论文摘要

众所周知,电子相互作用的标准模型位于亚稳态真空上。这只能通过新物理学来固定。目前,中微子物理学提供了制定新物理学的最吸引人的框架。之所以如此,是因为除了活跃标准中微子的轻度问题外,当前迷你蛋白实验结果可能表明无菌中微子存在并且也很轻。在这种情况下,可以合理地期望产生光线和无菌中微子的框架也可以稳定真空。为了实现这一目标,我们考虑了标准模型的扩展,该模型涉及以右手中微子($ν_r$)形式的新费米子和新的标量,以三重态($δ$)和Singlet($σ$)的形式。在此框架内,当我们认为Lepton Number在低能尺度上自发破坏时,就会获得微小的质量,这意味着$δ$和$σ$都会产生非常小的真空期望值。我们研究此设置是否导致稳定的真空。为此,我们通过确保模型从下方(BFB)界定的电势的四分之一的条件获得了整个条件,并评估了Higgs自我耦合的RGE进化。我们表明,在这种情况下,四分之一的耦合$φ^tΔφσ$,其中$φ$是标准的higgs Doublet,负责将Electroweak真空吸尘器的稳定性达到Planck量表。我们还通过违反Lepton风味(LFV)过程以及标准的Higgs的无形衰变来提取对潜力参数的约束。

It is well known that the Standard Model of the Electroweak interactions rests on a metastable vacuum. This can only be fixed by means of new physics. Presently neutrino physics provides the most intriguing framework to formulate new physics. This is so because, in addition to the problem of the lightness of the active standard neutrinos, currently MiniBooNE experimental result may be indicating that sterile neutrinos exist and are light, too. In this case, it is reasonable to expect that the framework that yields light active and sterile neutrinos could stabilize the vacuum, too. In order to achieve this goal, we consider an extension of the standard model which involves new fermions in the form of right-handed neutrinos ($ν_R$) and new scalars in the form of triplet ($Δ$) and singlet ($σ$). Within this framework, tiny masses are obtained when we consider that lepton number is spontaneously broken at low energy scale which means that $Δ$ and $σ$, both, develop very small vacuum expectation values. We investigate if this setting leads to a stable vacuum. For this we obtain the whole set of conditions over the Quartic Terms of the Potential that ensures that the model is Bounded From Below(BFB) and evaluate the RGE-evolution of the self coupling of the Higgs. We show that in such a scenario the Quartic Coupling $Φ^T ΔΦσ$, where $Φ$ is the standard Higgs doublet, is responsible for the stability of the Electroweak Vacuum up to Planck scale. We also extract constraints over the parameters of the Potential by means of Lepton Flavor Violating(LFV) processes and from invisible decay of the standard-like Higgs.

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