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arXiv 2012.13420hep-ph
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没有Higgs三重态的左右对称模型

Left-Right Symmetric Model without Higgs Triplets

K. S. Babu, Anil Thapa

摘要:

我们建立了一个基于规范群$SU(3)_C \otimes SU(2)_L \otimes SU(2)_R \otimes U(1)_{B-L}$的最小左右对称模型,其中传统上用于对称破缺的希格斯三重态被希格斯二重态所取代。右手中微子($(ν_R$)的马约拉纳质量是通过包含带电标量场$η^+$的双环图导出的。这种设置被证明是通过跷跷板机制的整个范围内的$W_R^\pm$质量,从TeV的大统一体规模的中微子振荡数据提供良好的拟合。当$W_R^\pm$质量在TeV量级时,$ν_R$质量在MeV范围内。我们分析了低能实验、早期宇宙学和超新星1987a对这种假设的约束,并证明了它的一致性。我们还研究了对撞机的影响,一个相对较轻的$η^+$标量通过其衰变成多轻子的最终状态,并得出了390 GeV的下限,其质量从大型强子对撞机,这可以提高到555 GeV,在其高光度运行。

英文摘要:

We develop a minimal left-right symmetric model based on the gauge group $SU(3)_C \otimes SU(2)_L \otimes SU(2)_R \otimes U(1)_{B-L}$ wherein the Higgs triplets conventionally employed for symmetry breaking are replaced by Higgs doublets. Majorana masses for the right-handed neutrinos $(ν_R$) are induced via two-loop diagrams involving a charged scalar field $η^+$. This setup is shown to provide excellent fits to neutrino oscillation data via the seesaw mechanism for the entire range of the $W_R^\pm$ mass, from TeV to the GUT scale. When the $W_R^\pm$ mass is at the TeV scale, the $ν_R$ masses turn out to be in the MeV range. We analyze constraints from low energy experiments, early universe cosmology and from supernova 1987a on such a scenario and show its consistency. We also study collider implications of a relatively light $η^+$ scalar through its decay into multi-lepton final states and derive a lower limit of 390 GeV on its mass from the LHC, which can be improved to 555 GeV in its high luminosity run.

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