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The charm fragmentation function has been measured in D* photoproduction with the ZEUS detector at HERA using an integrated luminosity of 120 pb-1. The fragmentation function is measured versus z = (E+p_parallel)D*/2Ejet, where E is the energy of the D* meson and p_parallel is the longitudinal momentum of the D* meson relative to the axis of the associated jet of energy Ejet. Jets were reconstructed using the kT clustering algorithm and required to have transverse energy larger than 9 GeV. Thedoi:10.1088/1126-6708/2009/04/082 fatcat:rhilixbqo5aslezysdi657d7xi