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, D.; Vranas, P.; Weinberg, E.; Witzel, O.

doi:10.1103/PhysRevD.99.014509

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

Journal Article · Tue Jan 15 00:00:00 EST 2019 · Physical Review. D.

DOI:https://doi.org/10.1103/PhysRevD.99.014509· OSTI ID:1490918

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, D.; Vranas, P.; Weinberg, E.; Witzel, O.

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=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 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.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Argonne National Laboratory (ANL), Argonne, IL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Univ. of Colorado, Boulder, CO (United States); Boston Univ., MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); RIKEN; USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF); USDOE Office of Science (SC), High Energy Physics (HEP)

Contributing Organization:: Lattice Strong Dynamics (LSD) Collaboration

Grant/Contract Number:: SC0008669; SC0009998; SC0010005; SC0012704; SC0015845; AC52-07NA27344; SC0014664; AC02-06CH11357; TG-PHY1200; 1066293; PHY-1748958; OCI-0749300; PHY-1417402; SC001466; AC02-05CH11231

OSTI ID:: 1490918

Alternate ID(s):: OSTI ID: 1491700; OSTI ID: 1497980; OSTI ID: 1504260; OSTI ID: 1550906; OSTI ID: 1607689; OSTI ID: 1764427; OSTI ID: 1833394

Report Number(s):: BNL-210887-2019-JAAM; LLNL-JRNL-753511; PRVDAQ; 014509

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Vol. 99 Journal Issue: 1; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 45 works

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