Determination of the QCD coupling αs
- 2 June 2000
- journal article
- review article
- Published by IOP Publishing in Journal of Physics G: Nuclear and Particle Physics
- Vol. 26 (7) , R27-R66
- https://doi.org/10.1088/0954-3899/26/7/201
Abstract
Theoretical basics and experimental determinations of the coupling parameter of the strong interaction, αs, are reviewed. The world average value of αs, expressed at the energy scale of the rest mass of the Z0 boson, is determined from analyses which are based on complete next-to-next-to-leading-order (NNLO) perturbative quantum chromodynamics (QCD). The result is αs(MZ0) = 0.1184±0.0031. No significant deviations or systematic biases of subsamples of experimental results are found. From the observed energy dependence of αs, which is in excellent agreement with the expectations of QCD, the number of colour degrees of freedom can be constrained to Nc = 3.03±0.12.Keywords
All Related Versions
This publication has 101 references indexed in Scilit:
- C-parameter and jet broadening at PETRA energiesPhysics Letters B, 1999
- Next-to-next-to-leading order vacuum polarization function of heavy quark near threshold and sum rules for systemPhysics Letters B, 1998
- A measurement of αs from the scaling violation in e+e− annihilationPhysics Letters B, 1997
- The αs3 correction to Γ(Z0 → hadronsPhysics Letters B, 1994
- Next-to-next-to-leading order QCD analysis of the Gross-Llewellyn Smith sum rule and the higher twist effectsPhysics Letters B, 1992
- Tests of quantum chromodynamics in hadronic decays of Z0 bosons produced in e+e− annihilationPhysics Reports, 1992
- On some possible extensions of the Brodsky-Lepage-Mackenzie approach beyond the next-to-leading orderPhysics Letters B, 1992
- A determination of the strong coupling constant αs from W production at the CERN pp̄ colliderPhysics Letters B, 1991
- Experimental investigation of the energy dependence of the strong coupling strengthPhysics Letters B, 1988
- Differential three-jet cross section in e+e−-annihilation and comparison with second-order predictions of QCD and abelian vector theoryPhysics Letters B, 1982