Large-Flavor QCD on the Lattice

الأصل · EN

We study the nature of the QCD vacuum at general number of flavors NF by numerical simulations on the lattice. Combining the results with those of the perturbation theory, we propose the following picture: 1) For NF ≥ 17, there exists only one IR fixed point at vanishing gauge coupling, i.e., the theory in the continuum limit is trivial. 2) For 16 ≥ NF ≥ 7, there is a non-trivial fixed point. Therefore, the theory is non-trivial with anomalous dimensions, however, without quark confinement. 3) For NF ≤ 6, theories satisfy both quark confinement and spontaneous chiral symmetry breaking in the continuum limit.