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Title: Nonperturbative β function of twelve-flavor SU(3) gauge theory

Journal Article · · Journal of High Energy Physics (Online)
 [1]; ORCiD logo [2]
  1. Univ. of Colorado, Boulder, CO (United States). Dept. of Physics
  2. Syracuse Univ., NY (United States). Dept. of Physics; Univ. of Bern (Switzerland). AEC Inst. for Theoretical Physics

We study the discrete β function of SU(3) gauge theory with N f = 12 massless fermions in the fundamental representation. Using an nHYP-smeared staggered lattice action and an improved gradient flow running coupling g ~ c 2 ( L ) we determine the continuum-extrapolated discrete β function up to g c 2 ≈ 8.2. We observe an IR fixed point at g * 2 = 7.3( -2 + 8 ) in the c = 8 t / L = 0.25 scheme, and g * 2 = 7.3( -3 + 6 ) with c = 0.3, combining statistical and systematic uncertainties in quadrature. The systematic effects we investigate include the stability of the (a/L) → 0 extrapolations, the interpolation of g ~ c 2 ( L ) as a function of the bare coupling, the improvement of the gradient flow running coupling, and the discretization of the energy density. In an appendix we observe that the resulting systematic errors increase dramatically upon combining smaller c ≲ 0.2 with smaller L ≤ 12, leading to an IR fixed point at g * 2 = 5.9(1.9) in the c = 0.2 scheme, which resolves to g * 2 = 6.9( -1 + 6 ) upon considering only L ≥ 16. At the IR fixed point we measure the leading irrelevant critical exponent to be γ g * = 0.26(2), comparable to perturbative estimates.

Research Organization:
Syracuse Univ., NY (United States); Univ. of Colorado, Boulder, CO (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF)
Grant/Contract Number:
SC0008669; SC0009998; SC0010005; CNS-0821794
OSTI ID:
1505130
Journal Information:
Journal of High Energy Physics (Online), Vol. 2018, Issue 2; ISSN 1029-8479
Publisher:
Springer BerlinCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 22 works
Citation information provided by
Web of Science

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Cited By (16)

Crawling technicolor journal November 2019
Gradient flow step-scaling function for SU(3) with twelve flavors journal December 2019
Infrared fixed point of SU(2) gauge theory with six flavors journal June 2018
Slope of the beta function at the fixed point of SU(2) gauge theory with six or eight flavors journal September 2018
Improved study of the β -function of S U ( 3 ) gauge theory with N f = 10 massless domain-wall fermions journal January 2019
Nonperturbative Renormalization of Operators in Near-Conformal Systems Using Gradient Flows journal November 2018
Infrared fixed point of SU(2) gauge theory with six flavors text January 2017
Crawling technicolor text January 2018
Slope of the beta function at the fixed point of SU(2) gauge theory with six or eight flavors text January 2018
The twisted gradient flow coupling at one loop journal March 2019
Nonperturbative determination of $β$ functions for SU(3) gauge theories with 10 and 12 fundamental flavors using domain wall fermions preprint January 2017
On the gradient flow of the Lagrangian density in non-Abelian gauge theories preprint January 2018
Infrared Behaviour of SU(2) Gauge Theory with $N_f$ fundamental flavours preprint January 2018
Tantalizing dilaton tests from a near-conformal EFT preprint January 2019
Studies of Conformal Behavior in Strongly Interacting Quantum Field Theories preprint January 2019
Short flow-time coefficients of CP-violating operators text January 2020

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