Lattice Monte Carlo data versus perturbation theory.

Differences between lattice Monte Carlo data and perturbation theory (for example the lack of asymptotic scaling) are usually associated with the 'bad' behaviour of the bare lattice coupling go due to the effects of large (and unknown! higher order terms in g(0). In this philosophy a new, renormalised coupling g' is defined with the aim of making the higher order coefficients of the perturbative series in g' as small as possible. In this paper an alternative scenario is discussed where lattice artifacts are proposed as the cause of the disagreement between Monte Carlo data and the go-perturbative series. We find that with the addition of a lattice artifact term, the usual asymptotic scaling expression in go is in excellent agreement with Monte Carlo data. Lattice data studied includes the string tension, the hadronic scale r(0), the discrete beta function, M(rho), f(pi) and the 1P-1S splitting in charmonium.