Lattice Study of Conformal Behavior in SU(3) Yang-Mills Theories

Details Lattice Study of Conformal Behavior in SU(3) Yang-Mills Theories Lattice Study of Conformal Behavior in SU(3) Yang-Mills Theories

2009-01-23

arxiv.org/abs/0901.3766v2

Phys.Rev.D79:076010,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

37 pages, 7 figures. v2: assorted minor updates and corrections

Scientific paper

10.1103/PhysRevD.79.076010

Using lattice simulations, we study the extent of the conformal window for an SU(3) gauge theory with N_f Dirac fermions in the fundamental representation. We extend our recently reported work, describing the general framework and the lattice simulations in more detail. We find that the theory is conformal in the infrared for N_f = 12, governed by an infrared fixed point, whereas the N_f = 8 theory exhibits confinement and chiral symmetry breaking. We therefore conclude that the low end of the conformal window N_f^c lies in the range 8 <= N_f^c <= 12. We discuss open questions and the potential relevance of the present work to physics beyond the standard model.

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