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Nonperturbative beta function of twelve-flavor SU(3) gauge theory · Around

2016

Nonperturbative beta function of twelve-flavor SU(3) gauge theory

Hasenfratz, Anna, Schaich, David

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We study the discrete beta function of SU(3) gauge theory with Nf=12 massless fermions in the fundamental representation.

Using an nHYP-smeared staggered lattice action and an improved gradient flow running coupling $\tilde g_c^2(L)$ we determine the continuum-extrapolated discrete beta function up to $g_c^2 \approx 8.2$.
We observe an IR fixed point at $g_{\star}^2 = 7.3\left(_{-2}^{+8}\right)$ in the $c = \sqrt{8t} / L = 0.25$ scheme, and $g_{\star}^2 = 7.3\left(_{-3}^{+6}\right)$ with c=0.3, combining statistical and systematic uncertainties in quadrature.
The systematic effects we investigate include the stability of the $(a / L) \to 0$ extrapolations, the interpolation of $\tilde g_c^2(L)$ as a function of the bare coupling, the improvement of the gradient flow running coupling, and the discretization of the energy density.

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