Determination of αs from ϒ Decays
The hadronic width of ?(nS) is described in lowest order in QCD as the decay into three gluons . The partial decay width Γ3g depends on the strong coupling constant to the third power and should thus allow a very accurate determination of α s . As all the partial decay widths of T involving the annihilation of the bƃ system are proportional to the square of the wave function at the origin, in order to eliminate the dependence from the unknown wave function we need to form ratios of widths.
KeywordsWorld Average Photon Spectrum Direct Photon Partial Decay Width Hadronic Event
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