skip to main content


This content will become publicly available on July 10, 2018

Title: 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 . Here, we perform a global fit of the parameters of simple VLQ models in minimal representations of S U ( 2 ) L to precision data and Higgs rates. One interesting connection between anomalous Z b$$\bar{b}$$ 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.
 [1] ;  [2] ;  [3]
  1. Univ. of Victoria, BC (Canada). Dept. of Physics and Astronomy; Perimeter Inst. for Theoretical Physics, Waterloo, ON (Canada)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). Dept. of Physics
  3. ETH Zurich (Switzerland). Inst. for Theoretical Physics
Publication Date:
Report Number(s):
Journal ID: ISSN 2470-0010; PRVDAQ; KA2401012
Grant/Contract Number:
SC00112704; 200021-165772; 200021-160811; SC0012704
Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 96; Journal Issue: 1; Journal ID: ISSN 2470-0010
American Physical Society (APS)
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Country of Publication:
United States
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; fermions; higgs; EFT; HET; GeV; VLQ; vector; quarks
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1369098