Electroweak phase transition with spontaneous Z2-breaking
Electroweak phase transition with spontaneous Z2-breaking
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DOI：
10.1007/jhep08(2020)107
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发表时间：
2019-11
影响因子：
5.4
通讯作者：
M. Carena;Zhen Liu;Yikun Wang
中科院分区：
文献类型：
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作者：
M. Carena;Zhen Liu;Yikun Wang
这项工作研究了标准模型的一个简单、代表性的扩展，它具有真正的标量单态和自发的Z2断裂，它允许强一级相变，这是弱电重子发生所需要的。我们进行了分析和数值计算，系统地包括单圈热效应、Coleman-Weinberg修正、雏菊恢复以及对气泡成核的评估。我们研究了其丰富的热历史，确定了在零温下发生具有近简并极值的强一阶电弱相变的条件。这需要质量低于50GeV的轻标量。奇异的希格斯衰变，以及在大型强子对撞机和未来对撞机设施进行的希格斯耦合精密测量，都将测试这个模型。可以从未来对撞机对希格斯自耦合的限制中获得额外的信息。引力波信号通常太低，无法被未来的引力波实验探测到。
This work investigates a simple, representative extension of the Standard Model with a real scalar singlet and spontaneous Z 2 breaking, which allows for a strongly first-order phase transition, as required by electroweak baryogenesis. We perform analytical and numerical calculations that systematically include one-loop thermal effects, Coleman-Weinberg corrections, and daisy resummation, as well as evaluation of bubble nucleation. We study the rich thermal history and identify the conditions for a strongly first-order electroweak phase transition with nearly degenerate extrema at zero temperature. This requires a light scalar with mass below 50 GeV. Exotic Higgs decays, as well as Higgs coupling precision measurements at the LHC and future collider facilities, will test this model. Additional information may be obtained from future collider constraints on the Higgs self-coupling. Gravitational-wave signals are typically too low to be probed by future gravitational wave experiments.