论文标题
通过量子zeno效应抑制希格斯的混合
Suppression of Higgs Mixing by Quantum Zeno Effect
论文作者
论文摘要
HIGGS门户网站相互作用与标准模型（SM）量规组的单线扇区的相互作用得到了广泛研究。在这封信中，我们表明，如果希格斯场与另一个单重标量表场混合，其衰减率大于两个质量特征态之间的质量差异，那么量子效应很重要。这种效果可以解释为量子zeno效应。在量子力学或量子场理论中，我们表明所产生的繁殖模式不是质量基质的本征态，而是相互作用的本征态。结果，即使幼稚的混合参数并不小，混合效应的脱钩也会发生在外来标量的衰减宽度的无限极限处。在外来标量的有限衰减宽度的情况下，我们得出了SM扇区中传播模式的有效质量，其衰减速率和1循环水平的耦合。事实证明，混合的质量本征可以模仿发现的125个Gev Higgs玻色子。这种模糊的希格斯玻色子可以在简单的可扰动性重量化模型中获得。当质量差小于$ {\ cal o}（0.1）$ gev（$ {\ cal o}（1）$ gev，对于$ {\ cal o}（1）$（$ {$ {\ cal o}（0.01）$），这与125 GEV SM Higgs Boson一致。我们认为，微小质量分裂的可能自然情况以及强键耦合单线部门的质量差异更大的可能性。为了探测模糊的希格斯玻色子场景，很难直接产生单线扇形颗粒。然而，未来的希格斯工厂可以通过精确测量希格斯玻色的衰变速率和希格斯耦合的偏差来探究这种情况。还提到了该机制的应用。
The Higgs portal interaction to a singlet sector of the standard model (SM) gauge group is widely-studied. In this Letter, we show that a quantum effect is important if the Higgs field mixes with another singlet scalar field whose decay rate is larger than the mass difference between the two mass eigenstates. This effect may be interpreted as the quantum Zeno effect. In either the quantum mechanics or the quantum field theory, we show that the resulting propagating mode is not the eigenstate of the mass matrix, but it is approximately the eigenstate of the interaction. As a consequence, the decoupling of the mixing effect happens at the infinity limit of the decay width of the exotic scalar even if the naïve mixing parameter is not small. With a finite decay width of the exotic scalar, we derive the effective mass of the propagating mode in the SM sector, its decay rate, and the couplings at the 1-loop level. It turns out that the mixed mass eigenstates can mimic the discovered 125 GeV Higgs boson. This fuzzy Higgs boson can be obtained in a simple perturbative renormalizable model. It is consistent with the 125 GeV SM Higgs boson when the mass difference is smaller than ${\cal O}(0.1)$GeV (${\cal O}(1)$GeV) for ${\cal O}(1)$ (${\cal O}(0.01)$) mixing. We argue the possible natural scenario for the tiny mass splitting and the possibility that the upper bound of the mass difference is larger for a strongly-coupled singlet sector. To probe the fuzzy Higgs boson scenario, it is difficult to directly produce the singlet sector particles. Nevertheless, the future Higgs factories may probe this scenario by precisely measuring the Higgs boson invisible decay rate and the deviation of the Higgs coupling. Applications of the mechanism are also mentioned.
