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| + | ====== TTP08-28 The Strong Coupling Constant at Low and High Energies ====== | ||
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| + | <hidden TTP08-28 | ||
| + | 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 and requires the proper matching | ||
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| + | at charm and bottom thresholds. | ||
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| + | leads to $\alpha_s(M_Z)=0.1198 \pm 0.0015$ as one of the most precise and | ||
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| + | NNNLO result for the strong coupling constant. We report a recent | ||
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| + | which is based on a lattice evaluation of the pseudoscalar correlator for | ||
| + | the charm quarks combined | ||
| + | with continuum perturbation theory. | ||
| + | </ | ||
| + | |**J.H. K& | ||
| + | |** Contribution to " | ||
| + | | {{preprints: | ||
| + | | | | ||