A measurement of αs from the scaling violation in e+e- annihilation

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Abstract

The hadronic fragmentation functions of the various quark flavours and of gluons are measured in a study of the inclusive hadron production from Z0 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 αs(Mz) = 0.1241+0.006-0.007(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. © 1997 Elsevier Science B.V.

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Abreu, P., Adam, W., Adye, T., Alemany, R., Allport, P. P., Almehed, S., … Zumerle, G. (1997). A measurement of αs from the scaling violation in e+e- annihilation. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 398(1–2), 194–206. https://doi.org/10.1016/S0370-2693(97)00256-6

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