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 . 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.
 Authors:
 Univ. of Victoria, BC (Canada). Dept. of Physics and Astronomy; Perimeter Inst. for Theoretical Physics, Waterloo, ON (Canada)
 Brookhaven National Lab. (BNL), Upton, NY (United States). Dept. of Physics
 ETH Zurich (Switzerland). Inst. for Theoretical Physics
 Publication Date:
 Research Org.:
 Brookhaven National Laboratory (BNL), Upton, NY (United States)
 Sponsoring Org.:
 USDOE Office of Science (SC), High Energy Physics (HEP) (SC25)
 OSTI Identifier:
 1377052
 Alternate Identifier(s):
 OSTI ID: 1369098
 Report Number(s):
 BNL1141962017JA
Journal ID: ISSN 24700010; PRVDAQ; KA2401012
 Grant/Contract Number:
 SC00112704; 200021165772; 200021160811; SC0012704
 Resource Type:
 Journal Article: Accepted Manuscript
 Journal Name:
 Physical Review D
 Additional Journal Information:
 Journal Volume: 96; Journal Issue: 1; Journal ID: ISSN 24700010
 Publisher:
 American Physical Society (APS)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; fermions; higgs; EFT; HET; GeV; VLQ; vector; quarks
Citation Formats
Chen, ChienYi, Dawson, S., and Furlan, Elisabetta. Vectorlike fermions and Higgs effective field theory revisited. United States: N. p., 2017.
Web. doi:10.1103/PhysRevD.96.015006.
Chen, ChienYi, Dawson, S., & Furlan, Elisabetta. Vectorlike fermions and Higgs effective field theory revisited. United States. doi:10.1103/PhysRevD.96.015006.
Chen, ChienYi, Dawson, S., and Furlan, Elisabetta. 2017.
"Vectorlike fermions and Higgs effective field theory revisited". United States.
doi:10.1103/PhysRevD.96.015006.
@article{osti_1377052,
title = {Vectorlike fermions and Higgs effective field theory revisited},
author = {Chen, ChienYi and Dawson, S. and Furlan, Elisabetta},
abstractNote = {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.},
doi = {10.1103/PhysRevD.96.015006},
journal = {Physical Review D},
number = 1,
volume = 96,
place = {United States},
year = 2017,
month = 7
}
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