Vectorlike fermions and Higgs effective field theory revisited

Heavy vectorlike quarks (VLQs) appear in many models of beyond the Standard Model physics. Direct experimental searches require these new quarks to be heavy, ≳800–1000  GeV. We perform a global fit of the parameters of simple VLQ models in minimal representations of SU(2)L to precision data and Higg...

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Bibliographic Details
Published in:Physical review. D 2017-07, Vol.96 (1), Article 015006
Main Authors: Chen, Chien-Yi, Dawson, S., Furlan, Elisabetta
Format: Article
Language:English
Subjects:
EFT
Fermions
Field theory
GeV
HET
higgs
Mathematical models
Parameters
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Quarks
Standard model (particle physics)
vector
VLQ
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Summary:Heavy vectorlike quarks (VLQs) appear in many models of beyond the Standard Model physics. Direct experimental searches require these new quarks to be heavy, ≳800–1000  GeV. We perform a global fit of the parameters of simple VLQ models in minimal representations of SU(2)L to precision data and Higgs rates. An interesting connection between anomalous Zbb¯ interactions and Higgs physics in VLQ models is discussed. Finally, we present our analysis in an effective field theory (EFT) framework and show that the parameters of VLQ models are already highly constrained. Exact and approximate analytical formulas for the S and T parameters in the VLQ models we consider are available in the Supplemental Material as Mathematica files.
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.96.015006