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Precise Determinations of the Strong Coupling Constant

✍ Scribed by J.H. Kühn

Publisher
Elsevier Science
Year
2008
Tongue
English
Weight
328 KB
Volume
181-182
Category
Article
ISSN
0920-5632

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✦ Synopsis

Recent results for the cross section of electron-positron annihilation into hadrons and for the decay rates of the Z-boson and the τ -lepton into hadrons including corrections of order α 4 s are reviewed. The consistency between two values of αs measured at vastly different energies constitutes a striking test of asymptotic freedom. Combining the results from Z and τ decays we find αs(MZ ) = 0.1198 ± 0.0015 as one of the most precise and presently only NNNLO result for the strong coupling constant.

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