Scaling violations of quark and gluon jet fragmentation functions in e +e- annihilations at √s = 91.2 and 183-209 GeV

Flavor inclusive, udsc and b fragmentation functionsin unbiased jets, and flavor inclusive, udsc, b and gluon fragmentation functionsin biased jets are measured in e+e- annihilations from data collected at center-of-mass energies of 91.2, and 183-209 GeV with the OPAL detector at LEP. The unbiased jets are defined by hemispheres of inclusive hadronic events, while the biased jet measurements are based on three-jet eventsselected with jet algorithms. Several methods are employed to ext. the fragmentation functionsover a wide range of scales. Possible biases are studied in the results obtained. The fragmentation functionsare compared to results from lower energy e+e- expts. and with earlier LEP measurements and are found to be consistent. Scaling violations are obsd. and are found to be stronger for the fragmentation functionsof gluonjets than for those of quarks. The measured fragmentation functionsare compared to three recent theor. next-to-leading order calcns. and to the predictions of three Monte Carlo event generators. While the Monte Carlo models are in good agreement with the data, the theor. predictions fail to describe the full set of results, in particular the b and gluonjet measurements. [on SciFinder (R)]