Nonperturbative investigations of SU(3) gauge theory with eight dynamical flavors

Appelquist, T, Brower, RC, Fleming, GT, Gasbarro, A, Hasenfratz, A, Jin, XY, Neil, ET, Osborn, JC, Rebbi, C, Rinaldi, E
et al (show 4 more authors) (2019) Nonperturbative investigations of SU(3) gauge theory with eight dynamical flavors. PHYSICAL REVIEW D, 99 (1). 014509-.

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We present our lattice studies of SU(3) gauge theory with $N_f$ = 8 degenerate fermions in the fundamental representation. Using nHYP-smeared staggered fermions we study finite-temperature transitions on lattice volumes as large as $L^3 \times N_t = 48^3 \times 24$, and the zero-temperature composite spectrum on lattice volumes up to $64^3 \times 128$. The spectrum indirectly indicates spontaneous chiral symmetry breaking, but finite-temperature transitions with fixed $N_t \leq 24$ enter a strongly coupled lattice phase as the fermion mass decreases, which prevents a direct confirmation of spontaneous chiral symmetry breaking in the chiral limit. In addition to the connected spectrum we focus on the lightest flavor-singlet scalar particle. We find it to be degenerate with the pseudo-Goldstone states down to the lightest masses reached so far by non-perturbative lattice calculations. Using the same lattice approach, we study the behavior of the composite spectrum when the number of light fermions is changed from eight to four. A heavy flavor-singlet scalar in the 4-flavor theory affirms the contrast between QCD-like dynamics and the low-energy behavior of the 8-flavor theory.

Item Type: Article
Additional Information: 31 pages, 36 figures, 8 tables. v2: update to published version
Uncontrolled Keywords: hep-lat, hep-lat, hep-ph
Depositing User: Symplectic Admin
Date Deposited: 09 Mar 2020 09:16
Last Modified: 18 Jan 2023 23:58
DOI: 10.1103/PhysRevD.99.014509
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