Measurement of charm fragmentation fractions inphotoproduction at HERA

Abstract

The production of $D^*$, $D^+$, $D^0$, $D_s$ and $\Lambda_c$ charm hadrons in ep scattering at HERA was studied with the ZEUS detector, and the fractions of c quarks hadronizing as a particular charm hadron were derived. The measurement has been performed in the photoproduction regime, using the full HERA II data set with a total integrated luminosity of 372 $pb^{-1}$. The obtained fractions are compared to previous results from HERA and from $e^+ e^-$ experiments