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

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...

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Bibliographic Details
Published in:Chinese physics C 2018-02, Vol.42 (2), p.38-48
Main Authors: 曹庆宏, 黄发朋, 谢柯盼, 张新民
Format: Article
Language:English
Subjects:
阶段转变
精确测试
模特儿
Higgs
操作符
正电子
衍生物
操作员
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Summary: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.
ISSN:1674-1137
0254-3052
DOI:10.1088/1674-1137/42/2/023103