New Determination of the Pole Mass of thebQuark Using Lattice QCD

Recent results from lattice QCD simulations provide a realistic picture, based upon first principles, of [Upsilon] physics. We combine these results with the experimentally measured mass of the [Upsilon] meson to obtain an accurate and reliable value for the [ital b] quark's pole mass. We use two different methods, each of which yields a mass consistent with [ital M][sub [ital b]]=5.0(2) GeV. This corresponds to a bare mass of [ital M][sub [ital b]][sup 0]=4.0(1) GeV in our lattice theory and an [bar M][bar S] mass of [ital M][sub [ital b]][sup [bar M][bar S]]([ital M][sub [ital b]])=4.0(1) GeV. ([bar M][bar S] denotes the modified minimal-subtraction scheme). We discuss the implications of this result for the [ital c]-quark mass.