Nonperturbative β function of eight-flavor SU(3) gauge theory

被引：37

作者：

Hasenfratz, Anna ^{[1
]}

Schaich, David ^{[2
]}

Veernala, Aarti ^{[2
]}

机构：

[1] Univ Colorado, Dept Phys, Boulder, CO 80309 USA

[2] Syracuse Univ, Dept Phys, Syracuse, NY 13244 USA

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2015年 / 06期

基金：

美国国家科学基金会;

关键词：

Lattice Gauge Field Theories; Renormalization Group; Technicolor and Composite Models; CHIRAL PHASE-TRANSITION; DYNAMICS; LIGHT; QCD;

D O I：

10.1007/JHEP06(2015)143

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

We present a new lattice study of the discrete beta function for SU(3) gauge theory with N-f = 8 massless flavors of fermions in the fundamental representation. Using the gradient flow running coupling, and comparing two different nHYP-smeared staggered lattice actions, we calculate the 8-flavor step-scaling function at significantly stronger couplings than were previously accessible. Our continuum-extrapolated results for the discrete beta function show no sign of an IR fixed point up to couplings of g(2) approximate to 14. At the same time, we find that the gradient flow coupling runs much more slowly than predicted by two-loop perturbation theory, reinforcing previous indications that the 8-flavor system possesses nontrivial strongly coupled IR dynamics with relevance to BSM phenomenology.

引用

页数：21

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