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

作　　者：曹庆宏 黄发朋 谢柯盼 张新民 

机构地区：[1]Department of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China [2]Collaborative Innovation Center of Quantum Matter, Beijing 100871, China [3]Center for High Energy Physics, Peking University, Beijing 100871, China [4]Theoretical Physics Division, Institute of High Energy Physics, Chinese Academy of Sciences, P.O.Box 918-4, Beijing 100049, China [5]School of Physics Sciences, University of Chinese Academy of Sciences, Beijing 100039, China

出　　处：《Chinese Physics C》2018年第2期38-48,共11页中国物理C（英文版）

基　　金：supported in part by the National Science Foundation of China(11175069,11275009,11422545);supported by the NSFC(11121092,11033005,11375202);by the CAS Pilot-B program;supported by the China Postdoctoral Science Foundation(2016M590133,2017T100108)

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.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.

关 键 词：HIGGS electroweak phase transition effective field theory 

分 类 号：O572.2[理学—粒子物理与原子核物理]