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arXiv 2005.03589hep-ph
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标量暗物质与电弱稳定性

Scalar Dark Matter and Electroweak Stability

Durmus Demir, Cem Salih Un

摘要:

基本粒子(SM)的标准模型,尽管在大型强子对撞机的实验完成,需要扩展的各种物理原因,包括冷暗物质(DM)。每个扩展都有其规模和机制,并且通常在回路水平上将电弱规模提升到其高规模。问题是保持电弱标度稳定,同时为上述重扩展提供空间。为此,事实证明,SM希格斯部门保持稳定的存在下,一个重标量,如果他们的四次耦合统一在一定的规模时,他们的质量是简并的。在这种质量简并驱动的统一(MDDU),标量下的关注被发现有资格作为一个可行的DM候选人,离开电弱规模稳定。我们详细的模拟研究明确表明,MDDU参数空间符合当前对撞机和天体物理界。我们的工作可以扩展到其他相关的标量(如黄子,暴胀子等)作为一种机制,通过它的电弱标度保持稳定。

英文摘要:

The standard model of elementary particles (SM), despite experimental completion at the LHC, needs to be extended for various physical reasons, including the cold dark matter (DM). Each extension comes with its scale and mechanism, and typically lifts, at the loop level, the electroweak scale towards its high scale. The problem is to keep the electroweak scale stable while providing a room for the aforementioned heavy extensions. To this end, it turns out that the SM Higgs sector remains stable in the presence of a heavy scalar if their quartic couplings unify at a certain scale when their masses are degenerate. Under this mass-degeneracy-driven unification (MDDU), the scalar under concern is found to qualify as a viable DM candidate and to leave the electroweak scale stable. Our detailed simulation studies explicitly show that the MDDU parameter space agrees with current collider and astrophysical bounds. Our work can be extended to other relevant scalars (like flavons, inflaton and others) as a mechanism by which the electroweak scale is held stable.

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