Global Electroweak Fit and Its Implication for Z'  

作　　者：张盈 蒋邵周 王青 

机构地区：[1]School of Science, Xi’an Jiaotong University [2]College of Physics Science and Technology, Guangxi University [3]Department of Physics, Tsinghua University [4]Center for High Energy Physics, Tsinghua University

出　　处：《Communications in Theoretical Physics》2014年第6期729-734,共6页理论物理通讯（英文版）

基　　金：Supported by National Natural Science Foundation of China(NSFC)under Grant Nos.11147192,11075085,and 11005084;Specialized Research Fund for the Doctoral Program of High Education of China No.20110002110010;Fundamental Research Funds for the Central Universities;Scientific Research Foundation of Guangxi University under Grant No.XBZ100686

摘　　要：Among the Z-pole observables, AFB^（0,b） and Ae display moderately large standard deviations from the Standard Model predictions. This result can be interpreted as independent experimental evidence for new physics beyond the SM, even if the 125 GeV Higgs-like boson at the LHC is ultimately confirmed as the SM Higgs. A recalculated global electroweak fit with a model-independent Z＇ shows that Z＇ can simultaneously suppress AFB（0,b） and Ae at the Z-pole, and reduce the largest deviation from 2.6σ in SM to 1.0σ in our scenario. The Z＇ fitting results also support a negative S parameter.

关 键 词：global fit Z＇ anomaly free chiral effective theory 

分 类 号：O41[理学—理论物理]