Physics of Elementary Particles and Fields

Global Electroweak Fit and Its Implication for Z'

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2014 Chinese Physical Society and IOP Publishing Ltd
, , Citation Zhang Ying et al 2014 Commun. Theor. Phys. 61 729 DOI 10.1088/0253-6102/61/6/11

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Author affiliations

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

Dates

  1. Received 25 November 2013
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0253-6102/61/6/729

Abstract

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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