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Bottom quark mass and alpha(s) from the Upsilon system

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Bottom quark mass and alpha(s) from the Upsilon system

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Jamin, Matthias; Pich Zardoya, Antonio

Aquest document és un/a article, creat/da en: 1997

The mass of the bottom quark and the strong coupling constant alpha(s) are determined from QCD moment sum rules for the T system. Two analyses are performed using both the pole mass M-b as well as the mass m(b) in the <(MS)over bar> scheme. In the pole-mass scheme large perturbative corrections resulting from Coulombic contributions have to be resummed. In the <(MS)over bar> scheme this can be avoided by an appropriate choice for the renormalization scale. For the bottom quark mass we obtain M-b = 4.60+/-0.02 GeV and m(b)(m(b)) = 4.13+/-0.00 GeV. Our combined result from both determinations for the strong coupling is alpha(s)(M-Z) = 0.119+/-0.008.

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