We study chimera baryons, fermion bound states composed of two (hyper)quarks transforming in the fundamental and one in the antisymmetric representation of a non-Abelian gauge group. While in QCD they coincide with ordinary baryons, in composite Higgs models (CHMs) with top partial compositeness, spin-1/2 chimera baryons serve as partners of the top quark and are responsible for its large mass. We perform non-perturbative lattice calculations of the low-lying spectrum of the chimera baryons, in a specific realization of CHMs based on a Sp(4) gauge theory. In the quenched approximation, we present the numerical results in the continuum and massless limits. Then, for dynamical fermions, we measure the spectrum and matrix elements by employing a newly developed spectral density analysis for several choices of the lattice parameters.
@article{arxiv.2604.04433,
title = {Lattice studies of chimera baryons in Sp(4) gauge theory},
author = {Jong-Wan Lee and Ed Bennett and Luigi Del Debbio and Niccolò Forzano and Ryan C. Hill and Deog Ki Hong and Ho Hsiao and C. -J. David Lin and Biagio Lucini and Alessandro Lupo and Maurizio Piai and Davide Vadacchino and Fabian Zierler},
journal= {arXiv preprint arXiv:2604.04433},
year = {2026}
}
Comments
4 pages, 4 figures, Proceedings of the 2025 International Conference on the Structure of Baryons (Baryons 2025), 10-14 Nov. 2025, Jeju, South Korea