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

作者：Hasenfratz Anna^*; Schaich David; Veernala Aarti

来源：The Journal of High Energy Physics, 2015, 2015(6): 143.

DOI：10.1007/JHEP06(2015)143

• Lattice Gauge Field Theories
• Renormalization Group
• Technicolor and Composite Models

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.

• 出版日期2015-6-22