# 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) (SC-25)

- OSTI Identifier:
- 1377052

- Alternate Identifier(s):
- OSTI ID: 1369098

- Report Number(s):
- BNL-114196-2017-JA

Journal ID: ISSN 2470-0010; PRVDAQ; KA2401012

- Grant/Contract Number:
- SC00112704; 200021-165772; 200021-160811; SC0012704

- Resource Type:
- Journal Article: Accepted Manuscript

- Journal Name:
- Physical Review D

- Additional Journal Information:
- Journal Volume: 96; Journal Issue: 1; Journal ID: ISSN 2470-0010

- 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, Chien-Yi, 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, Chien-Yi, Dawson, S., & Furlan, Elisabetta.
```*Vectorlike fermions and Higgs effective field theory revisited*. United States. doi:10.1103/PhysRevD.96.015006.

```
Chen, Chien-Yi, Dawson, S., and Furlan, Elisabetta. Mon .
"Vectorlike fermions and Higgs effective field theory revisited". United States.
doi:10.1103/PhysRevD.96.015006. https://www.osti.gov/servlets/purl/1377052.
```

```
@article{osti_1377052,
```

title = {Vectorlike fermions and Higgs effective field theory revisited},

author = {Chen, Chien-Yi 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 = {Mon Jul 10 00:00:00 EDT 2017},

month = {Mon Jul 10 00:00:00 EDT 2017}

}

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