Bottom quark mass and alphas from the Upsilon system
Abstract
The mass of the bottom quark and the strong coupling constant alphas are determined from QCD moment sum rules for the Upsilon system. Two analyses are performed using both the pole mass Mb as well as the mass mb in the scheme. In the pole-mass scheme large perturbative corrections resulting from coulombic contributions have to be resummed. In the scheme this can be avoided by an appropriate choice for the renormalization scale. For the bottom quark mass we obtain Mb = 4.60 +- 0.02 GeV and mb(mb) = 4.13 +- 0.06 GeV. Our combined result from both determinations for the strong coupling is alphas(MZ) = 0.119 +- 0.008.
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