Lattice simulations with eight flavors of domain wall fermions in SU(3) gauge theory

T. Appelquist; R. C. Brower; G. T. Fleming; J. Kiskis; M. F. Lin; E. T. Neil; J. C. Osborn; C. Rebbi; E. Rinaldi; D. Schaich; C. Schroeder; S. Syritsyn; G. Voronov; P. Vranas; E. Weinberg; O. Witzel

doi:10.1103/PhysRevD.90.114502

Lattice simulations with eight flavors of domain wall fermions in SU(3) gauge theory

T. Appelquist, R. C. Brower, G. T. Fleming, J. Kiskis, M. F. Lin, E. T. Neil, J. C. Osborn, C. Rebbi, E. Rinaldi, D. Schaich, C. Schroeder, S. Syritsyn, G. Voronov, P. Vranas, E. Weinberg, O. Witzel

School of Physics and Astronomy

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Abstract

We study an SU(3) gauge theory with Nf=8 degenerate flavors of light fermions in the fundamental representation. Using the domain wall fermion formulation, we investigate the light hadron spectrum, chiral condensate 〈ψ¯ψ〉 and electroweak S parameter. We consider a range of light fermion masses on two lattice volumes at a single gauge coupling chosen so that IR scales approximately match those from our previous studies of the two- and six-flavor systems. Our results for the Nf=8 spectrum suggest spontaneous chiral symmetry breaking, though fits to the fermion mass dependence of spectral quantities do not strongly disfavor the hypothesis of mass-deformed infrared conformality. Compared to Nf=2 we observe a significant enhancement of 〈ψ¯ψ〉 relative to the symmetry breaking scale F, similar to the situation for Nf=6. The reduction of the S parameter, related to parity doubling in the vector and axial-vector channels, is also comparable to our six-flavor results.

Original language	English
Article number	114502
Journal	Physical Review D
Volume	90
Issue number	11
DOIs	https://doi.org/10.1103/PhysRevD.90.114502
Publication status	Published - 12 Dec 2014

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Appelquist, T., Brower, R. C., Fleming, G. T., Kiskis, J., Lin, M. F., Neil, E. T., Osborn, J. C., Rebbi, C., Rinaldi, E., Schaich, D., Schroeder, C., Syritsyn, S., Voronov, G., Vranas, P., Weinberg, E., & Witzel, O. (2014). Lattice simulations with eight flavors of domain wall fermions in SU(3) gauge theory. Physical Review D, 90(11), Article 114502. https://doi.org/10.1103/PhysRevD.90.114502

@article{ece41509465946cf87ea44fbca3dad54,

title = "Lattice simulations with eight flavors of domain wall fermions in SU(3) gauge theory",

abstract = "We study an SU(3) gauge theory with Nf=8 degenerate flavors of light fermions in the fundamental representation. Using the domain wall fermion formulation, we investigate the light hadron spectrum, chiral condensate 〈ψ¯ψ〉 and electroweak S parameter. We consider a range of light fermion masses on two lattice volumes at a single gauge coupling chosen so that IR scales approximately match those from our previous studies of the two- and six-flavor systems. Our results for the Nf=8 spectrum suggest spontaneous chiral symmetry breaking, though fits to the fermion mass dependence of spectral quantities do not strongly disfavor the hypothesis of mass-deformed infrared conformality. Compared to Nf=2 we observe a significant enhancement of 〈ψ¯ψ〉 relative to the symmetry breaking scale F, similar to the situation for Nf=6. The reduction of the S parameter, related to parity doubling in the vector and axial-vector channels, is also comparable to our six-flavor results.",

author = "T. Appelquist and Brower, {R. C.} and Fleming, {G. T.} and J. Kiskis and Lin, {M. F.} and Neil, {E. T.} and Osborn, {J. C.} and C. Rebbi and E. Rinaldi and D. Schaich and C. Schroeder and S. Syritsyn and G. Voronov and P. Vranas and E. Weinberg and O. Witzel",

year = "2014",

month = dec,

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doi = "10.1103/PhysRevD.90.114502",

language = "English",

volume = "90",

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issn = "1550-7998",

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Appelquist, T, Brower, RC, Fleming, GT, Kiskis, J, Lin, MF, Neil, ET, Osborn, JC, Rebbi, C, Rinaldi, E, Schaich, D, Schroeder, C, Syritsyn, S, Voronov, G, Vranas, P, Weinberg, E & Witzel, O 2014, 'Lattice simulations with eight flavors of domain wall fermions in SU(3) gauge theory', Physical Review D, vol. 90, no. 11, 114502. https://doi.org/10.1103/PhysRevD.90.114502

TY - JOUR

T1 - Lattice simulations with eight flavors of domain wall fermions in SU(3) gauge theory

AU - Appelquist, T.

AU - Brower, R. C.

AU - Fleming, G. T.

AU - Kiskis, J.

AU - Lin, M. F.

AU - Neil, E. T.

AU - Osborn, J. C.

AU - Rebbi, C.

AU - Rinaldi, E.

AU - Schaich, D.

AU - Schroeder, C.

AU - Syritsyn, S.

AU - Voronov, G.

AU - Vranas, P.

AU - Weinberg, E.

AU - Witzel, O.

PY - 2014/12/12

Y1 - 2014/12/12

N2 - We study an SU(3) gauge theory with Nf=8 degenerate flavors of light fermions in the fundamental representation. Using the domain wall fermion formulation, we investigate the light hadron spectrum, chiral condensate 〈ψ¯ψ〉 and electroweak S parameter. We consider a range of light fermion masses on two lattice volumes at a single gauge coupling chosen so that IR scales approximately match those from our previous studies of the two- and six-flavor systems. Our results for the Nf=8 spectrum suggest spontaneous chiral symmetry breaking, though fits to the fermion mass dependence of spectral quantities do not strongly disfavor the hypothesis of mass-deformed infrared conformality. Compared to Nf=2 we observe a significant enhancement of 〈ψ¯ψ〉 relative to the symmetry breaking scale F, similar to the situation for Nf=6. The reduction of the S parameter, related to parity doubling in the vector and axial-vector channels, is also comparable to our six-flavor results.

AB - We study an SU(3) gauge theory with Nf=8 degenerate flavors of light fermions in the fundamental representation. Using the domain wall fermion formulation, we investigate the light hadron spectrum, chiral condensate 〈ψ¯ψ〉 and electroweak S parameter. We consider a range of light fermion masses on two lattice volumes at a single gauge coupling chosen so that IR scales approximately match those from our previous studies of the two- and six-flavor systems. Our results for the Nf=8 spectrum suggest spontaneous chiral symmetry breaking, though fits to the fermion mass dependence of spectral quantities do not strongly disfavor the hypothesis of mass-deformed infrared conformality. Compared to Nf=2 we observe a significant enhancement of 〈ψ¯ψ〉 relative to the symmetry breaking scale F, similar to the situation for Nf=6. The reduction of the S parameter, related to parity doubling in the vector and axial-vector channels, is also comparable to our six-flavor results.

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DO - 10.1103/PhysRevD.90.114502

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VL - 90

JO - Physical Review D

JF - Physical Review D

IS - 11

M1 - 114502

ER -

Lattice simulations with eight flavors of domain wall fermions in SU(3) gauge theory

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