Abstract

In my talk, I will speak about a recent study of charm fragmentation done at H1 experiment at DESY. After a brief introduction I will rescribe the measurement of the differential cross sections of D^*± mesons as a function of two scaling variables z_hem and z_jet. These cross sections are used to extract free parameters of nonperturbative fragmentation functions for QCD based models. When the presence of a D^*± jet with E_T^* > 3 GeV is required, the parameters extracted from the two distributions are in agreement, and agreement is also found with the value extracted from e⁺e^– data by ALEPH. However, for the event sample without such a jet, significantly different parameters for the fragmentation functions are needed to describe the data.