## Baryon spectrum of SU(4) composite Higgs theory with two distinct fermion representations

## Abstract

We use lattice simulations to compute the baryon spectrum of SU(4) lattice gauge theory coupled to dynamical fermions in the fundamental and two-index antisymmetric (sextet) representations simultaneously. This model is closely related to a composite Higgs model in which the chimera baryon made up of fermions from both representations plays the role of a composite top-quark partner. The dependence of the baryon masses on each underlying fermion mass is found to be generally consistent with a quark-model description and large- N _{c} scaling. We combine our numerical results with experimental bounds on the scale of the new strong sector to estimate a lower bound on the mass of the top-quark partner. We discuss some theoretical uncertainties associated with this estimate.

- Authors:

- Univ. of Colorado, Boulder, CO (United States)
- Univ. of Colorado, Boulder, CO (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
- Tel Aviv Univ., Ramat Aviv (Israel)

- Publication Date:

- Research Org.:
- Univ. of Colorado, Boulder, CO (United States)

- Sponsoring Org.:
- USDOE

- OSTI Identifier:
- 1441073

- Alternate Identifier(s):
- OSTI ID: 1498851

- Grant/Contract Number:
- sc0010005; SC0012704

- Resource Type:
- Published Article

- Journal Name:
- Physical Review D

- Additional Journal Information:
- Journal Volume: 97; Journal Issue: 11; 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

### Citation Formats

```
Ayyar, Venkitesh, DeGrand, Thomas, Hackett, Daniel C., Jay, William I., Neil, Ethan T., Shamir, Yigal, and Svetitsky, Benjamin. Baryon spectrum of SU(4) composite Higgs theory with two distinct fermion representations. United States: N. p., 2018.
Web. doi:10.1103/physrevd.97.114505.
```

```
Ayyar, Venkitesh, DeGrand, Thomas, Hackett, Daniel C., Jay, William I., Neil, Ethan T., Shamir, Yigal, & Svetitsky, Benjamin. Baryon spectrum of SU(4) composite Higgs theory with two distinct fermion representations. United States. doi:10.1103/physrevd.97.114505.
```

```
Ayyar, Venkitesh, DeGrand, Thomas, Hackett, Daniel C., Jay, William I., Neil, Ethan T., Shamir, Yigal, and Svetitsky, Benjamin. Fri .
"Baryon spectrum of SU(4) composite Higgs theory with two distinct fermion representations". United States. doi:10.1103/physrevd.97.114505.
```

```
@article{osti_1441073,
```

title = {Baryon spectrum of SU(4) composite Higgs theory with two distinct fermion representations},

author = {Ayyar, Venkitesh and DeGrand, Thomas and Hackett, Daniel C. and Jay, William I. and Neil, Ethan T. and Shamir, Yigal and Svetitsky, Benjamin},

abstractNote = {We use lattice simulations to compute the baryon spectrum of SU(4) lattice gauge theory coupled to dynamical fermions in the fundamental and two-index antisymmetric (sextet) representations simultaneously. This model is closely related to a composite Higgs model in which the chimera baryon made up of fermions from both representations plays the role of a composite top-quark partner. The dependence of the baryon masses on each underlying fermion mass is found to be generally consistent with a quark-model description and large- Nc scaling. We combine our numerical results with experimental bounds on the scale of the new strong sector to estimate a lower bound on the mass of the top-quark partner. We discuss some theoretical uncertainties associated with this estimate.},

doi = {10.1103/physrevd.97.114505},

journal = {Physical Review D},

number = 11,

volume = 97,

place = {United States},

year = {2018},

month = {6}

}

DOI: 10.1103/physrevd.97.114505

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