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

Appelquist, T.; Brower, R. C.; Fleming, G. T.; Gasbarro, A.; Hasenfratz, A.; Jin, X. Y.; Neil, E. T.; Osborn, J. C.; Rebbi, C.; Rinaldi, E.; Schaich, David Alexander; Vranas, P.; Weinberg, E.; Witzel, O. (2019). Nonperturbative investigations of SU(3) gauge theory with eight dynamical flavors. Physical review. D - particles, fields, gravitation, and cosmology, 99(1), 014509. American Physical Society 10.1103/PhysRevD.99.014509

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We present our lattice studies of SU(3) gauge theory with Nf = 8 degenerate fermions in the fundamental representation. Using nHYP-smeared staggered fermions we study finite-temperature transitions on lattice volumes as large as L³ × Nt 1⁄4 48³ × 24, and the zero-temperature composite spectrum on lattice volumes up to 64³ × 128. The spectrum indirectly indicates spontaneous chiral symmetry breaking, but finite-temperature transitions with fixed Nt ≤ 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 nonperturbative 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:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Theoretical Physics

UniBE Contributor:

Schaich, David Alexander

Subjects:

500 Science > 530 Physics

ISSN:

1550-7998

Publisher:

American Physical Society

Language:

English

Submitter:

Esther Fiechter

Date Deposited:

26 Feb 2019 17:32

Last Modified:

23 Oct 2019 04:03

Publisher DOI:

10.1103/PhysRevD.99.014509

ArXiv ID:

1807.08411

BORIS DOI:

10.7892/boris.125604

URI:

https://boris.unibe.ch/id/eprint/125604

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