World Summary of αs (2011)

The most significant determinations of the strong coupling strength, αs, are summarised and a new world average value of αs(MZ) is determined, using a new method of pre-averaging results within classes of measurements like hadronic τ decays, deep inelastic scattering processes, determinations on the lattice, electro-positron annihilation processes and electro-weak precision fits. The overall result isαs(MZ)=0.1184±0.0007, unchanged from itʼs corresponding value obtained in 2009.