Global Electroweak Fit and Its Implication for Z

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...

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Published inCommunications in theoretical physics Vol. 61; no. 6; pp. 729 - 734
Main Author 张盈 蒋邵周 王青
Format Journal Article
LanguageEnglish
Published 01.06.2014
Subjects
Bosons
Deviation
Mathematical models
S parameters
Standard deviation
Standard model (particle physics)
Texts
Theoretical physics
实验证据
弱电
最大偏差
标准偏差
标准模型
物理学
空军基地
Online AccessGet full text
ISSN0253-6102
1572-9494
DOI10.1088/0253-6102/61/6/11

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Summary: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.
Bibliography:ZHANG Ying, JIANG Shao-Zhou , WANG Qing（1 School of Science, Xi＇an Jiaotong University, Xi＇an 710049, China;2 College of Physics Science and Technology, Guangxi University, Nanning 530004, China;3 Department of Physics, Tsinghua University, Beijing 100084, China;4 Center for High Energy Physics, Tsinghua University, Beijing 100084, China;5 Collaborative Innovation Center of Quantum Matter, Beijing 100084, China）
global fit, Z＇, anomaly free, chiral effective theory
11-2592/O3
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.
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ISSN:0253-6102
1572-9494
DOI:10.1088/0253-6102/61/6/11