A Measurement of alpha-s from the scaling violation in e+ e- annihilation
Collaboration
18 pages
Published in:
- Phys.Lett.B 398 (1997) 194-206
Report number:
- CERN-PPE-96-185
Experiments:
View in:
Citations per year
Abstract: (Elsevier)
The hadronic fragmentation functions of the various quark flavours and of gluons are measured in a study of the inclusive hadron production from Z 0 decays with the DELPHI detector and are compared with the fragmentation functions measured elsewhere at energies between 14 GeV and 91 GeV. A large scaling violation is observed, which is used to extract the strong coupling constant from a fit using a numerical integration of the second order DGLAP evolution equations. The result is α s ( M Z ) = 0.124 −0.007 +0.006 (exp) ± 0.009(theory) where the first error represents the experimental uncertainty and the second error is due to the factorization and renormalization scale dependence.- electron positron: colliding beams
- electron positron: annihilation
- electron positron: inclusive reaction
- Z0: electroproduction
- Z0: hadronic decay
- quark: fragmentation function
- gluon: fragmentation function
- dependence: flavor
- scaling: violation
- strong interaction: coupling constant
References(36)
Figures(0)