Vectorlike fermions and Higgs effective field theory revisited

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 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review D American Physical Society (APS)

Vectorlike fermions and Higgs effective field theory revisited

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Vectorlike fermions and Higgs effective field theory revisited

Abstract

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.
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Publisher
The American Physical Society
Copyright
Copyright © © 2017 American Physical Society
ISSN
1550-7998
eISSN
1550-2368
D.O.I.
10.1103/PhysRevD.96.015006
Publisher site
See Article on Publisher Site

Abstract

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.

Journal

Physical Review DAmerican Physical Society (APS)

Published: Jul 1, 2017

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