2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/49016In this talk, we consider the computation of D and B fragmentation functions in e+e- annihilation. We present an improved differential cross section that merges together the O(alpha_s^2) fixed-order calculation and the next-to-leading-logarithmic resummed one. We compare the results of fitting present data using the next-to-leading-log cross section, the O(alpha_s^2) fixed-order and the improved one.Talk given at XXXIV Rencontres De Moriond: QCD and High Energy Hadronic Interactions, Les Arc 1800, France, 20-27 March 1999High Energy Physics - Phenomenologytext