Measurement of αs from scaling violations in fragmentation functions in e+e− annihilation

A study of scaling violations in fragmentation functionsperformed by the ALEPHcollaboration at LEP is presented. Data samples enriched in uds, c, b and gluonjets, respectively, together with measurements of the longitudinal and transverse inclusive cross sections are used to extract the fragmentation functionfor the gluonand for each flavour. The measurements are compared to data from experiments at energies between 22 GeV and 91 GeV and scaling violations consistent with QCD predictions are observed. From this, a measurement of the strong coupling constant αs(Mz) = 0.126 ±0.009 is obtained.