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arXiv 1408.3533hep-phastro-ph.CO
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强一级电弱相变与经典标度不变性

Strongly First-Order Electroweak Phase Transition and Classical Scale Invariance

Arsham Farzinnia, Jing Ren

摘要:

在这项工作中,我们研究的可能性,实现一个强烈的一阶电弱相变内的最小经典尺度不变的扩展的标准模型(SM),以前提出和分析的层次结构问题的一个潜在的解决方案。通过引入一个复杂的单重标量和三个右手Majorana中微子,该方案成功地实现了电弱对称性的辐射破缺(科尔曼-温伯格机制),诱导SM中微子的非零质量(跷跷板机制),提出了一个赝标量暗物质候选者,并预测除了125 GeV标量之外,还存在第二个$CP$ -偶玻色子。我们构建了完整的有限温度单回路有效势的模型,包括mummed热菊花回路,并证明有限温度效应诱导一阶电弱相变。要求热驱动的一阶相变足够强进一步限制了模型的参数空间;特别是,宇宙中暗物质的$\mathcal O(0.01)$部分可以同时容纳一个强一阶电弱相变。此外,这种相变不利于右手马约拉纳中微子质量超过几百GeV,将暗物质赝标量质量限制在$\sim 1$-2 TeV,预测第二个$CP$ -偶标量的质量为$\sim 100$-300 GeV,并且要求SM双重态和复合单态的$CP$ -偶分量之间的混合角在$0.2 \lesssim \sinω\lesssim 0.4$范围内。所获得的结果显示在综合排除图中,识别参数空间的可行区域。这些预测中的许多都在下一次LHC运行的范围内。

英文摘要:

In this work, we examine the possibility of realizing a strongly first-order electroweak phase transition within the minimal classically scale invariant extension of the standard model (SM), previously proposed and analyzed as a potential solution to the hierarchy problem. By introducing one complex singlet scalar and three right-handed Majorana neutrinos, the scenario was successfully capable of achieving a radiative breaking of the electroweak symmetry (Coleman-Weinberg Mechanism), inducing non-zero masses for the SM neutrinos (seesaw mechanism), presenting a pseudoscalar dark matter candidate, and predicting the existence of a second $CP$-even boson in addition to the 125 GeV scalar. We construct the full finite-temperature one-loop effective potential of the model, including the resummed thermal daisy loops, and demonstrate that finite-temperature effects induce a first-order electroweak phase transition. Requiring the thermally-driven first-order phase transition to be sufficiently strong further constrains the model's parameter space; in particular, an $\mathcal O(0.01)$ fraction of the dark matter in the universe may be simultaneously accommodated with a strongly first-order electroweak phase transition. Moreover, such a phase transition disfavors right-handed Majorana neutrino masses above several hundreds of GeV, confines the pseudoscalar dark matter masses to $\sim 1$-2 TeV, predicts the mass of the second $CP$-even scalar to be $\sim 100$-300 GeV, and requires the mixing angle between the $CP$-even components of the SM doublet and the complex singlet to lie within the range $0.2 \lesssim \sinω\lesssim 0.4$. The obtained results are displayed in comprehensive exclusion plots, identifying the viable regions of the parameter space. Many of these predictions lie within the reach of the next LHC run.

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