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Nonperturbative investigations of SU(3) gauge theory with eight dynamical flavors
- Source :
- Phys. Rev. D 99, 014509 (2019)
- Publication Year :
- 2018
-
Abstract
- 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.<br />Comment: 31 pages, 36 figures, 8 tables. v2: update to published version
- Subjects :
- High Energy Physics - Lattice
High Energy Physics - Phenomenology
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. D 99, 014509 (2019)
- Publication Type :
- Report
- Accession number :
- edsarx.1807.08411
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevD.99.014509