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arXiv 1708.04737hep-ph
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在轻子对撞机上检验标量扩展模型中的电弱相变

Testing the electroweak phase transition in scalar extension models at lepton colliders

Qing-Hong Cao, Fa Peng Huang, Ke-Pan Xie, Xinmin Zhang

摘要:

研究了标准模型之外的三种标量扩展模型中的电弱相变。假设新标量在某个重标度上解耦,我们使用协变导数展开方法导出了所有的6维有效算子,其系数在特定模型中高度相关。我们提供的边界,包括电弱精密测试和最近的希格斯测量的完整的一套尺寸-6运营商。我们发现,强烈的一级相变(诱导的$|H|^6$运营商)的参数空间可以广泛探讨在未来的电子-正电子对撞机生产$Zh$。

英文摘要:

We study the electroweak phase transition in three scalar extension models beyond the Standard Model. Assuming new scalars are decoupled at some heavy scale, we use the covariant derivative expansion method to derive all of the dimension-6 effective operators, whose coefficients are highly correlated in a specific model. We provide bounds to the complete set of dimension-6 operators by including the electroweak precision test and recent Higgs measurements. We find that the parameter space of strong first-order phase transitions (induced by the $|H|^6$ operator) can be probed extensively in $Zh$ production at future electron-positron colliders.

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