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We calculate the string tension, K, and some of the lightest glueball masses,M, in 3+1 dimensional SU(N) lattice gauge theories for N=2,3,4,5 . From thecontinuum extrapolation of the lattice values, we find that the mass ratios,M/sqrt(K), appear to show a rapid approach to the large-N limit, and, indeed,can be described all the way down to SU(2) using just a leading O(1/NxN)correction. We confirm that the smooth large-N limit we find, is obtained bykeeping a constant 't Hooft coupling. We also calculate the topological chargeof the gauge fields. We observe that, as expected, the density of small-sizeinstantons vanishes rapidly as N increases, while the topologicalsusceptibility appears to have a non-zero N=infinity limit.

SU(N) gauge theories in four dimensions: exploring the approach to N = ∞