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| + | ====== TTP08-21 Precise Determinations of the Strong Coupling Constant ====== | ||
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| + | <hidden TTP08-21 | ||
| + | cross section of electron-positron annihilation into hadrons and for the | ||
| + | decay rates of the $Z$-boson and the $\tau$-lepton into hadrons including | ||
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| + | The consistency between two values | ||
| + | at vastly different energies constitutes | ||
| + | a striking test of asymptotic freedom. | ||
| + | | ||
| + | we find $\alpha_s(M_Z)=0.1198 \pm 0.0015$ as one of the most precise and | ||
| + | | ||
| + | NNNLO result for the strong coupling constant. | ||
| + | </ | ||
| + | |**J.H. K& | ||
| + | |** Nucl. Phys. B (Proc.Suppl.) | ||
| + | | {{preprints: | ||
| + | | | | ||