ORCID
- Davide Vadacchino: 0000-0002-5783-5602
Abstract
We report the results of lattice numerical studies of the Sp(4) gauge theory coupled to fermions (hyperquarks) transforming in the fundamental and two-index antisymmetric representations of the gauge group. This strongly-coupled theory is the minimal candidate for the ultraviolet completion of composite Higgs models that facilitate the mechanism of partial compositeness for generating the top-quark mass. We measure the spectrum of the low-lying, half-integer spin, bound states composed of two fundamental and one antisymmetric hyperquarks, dubbed chimera baryons, in the quenched approximation. In this first systematic, non-perturbative study, we focus on the three lightest parity-even chimera-baryon states, in analogy with QCD, denoted as $\Lambda_{\rm CB}$, $\Sigma_{\rm CB}$ (both with spin 1/2), and $\Sigma_{\rm CB}^\ast$(with spin 3/2). The spin-1/2 such states are candidates of the top partners. The extrapolation of our results to the continuum and massless-hyperquark limit is performed using formulae inspired by QCD heavy-baryon Wilson chiral perturbation theory. Within the range of hyperquark masses in our simulations, we find that $\Sigma_{\mathrm{CB}}$ is not heavier than $\Lambda_{\mathrm{CB}}$.
DOI
10.48550/arxiv.2311.14663
Publication Date
2023-11-24
Keywords
hep-lat, hep-ph, hep-th
Recommended Citation
Bennett, E., Hong, D., Hsiao, H., Lee, J., Lin, C., Lucini, B., Piai, M., & Vadacchino, D. (2023) 'Lattice investigations of the chimera baryon spectrum in the Sp(4) gauge theory', Available at: https://doi.org/10.48550/arxiv.2311.14663
