Abstract
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)D*/2Ejet, where E is the energy of the D* meson and p 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. The D* meson associated with the jet was required to have a transverse momentum larger than 2 GeV. The measured function is compared to different fragmentation models incorporated in leading-logarithm Monte Carlo simulations and in a next-to-leading-order QCD calculation. The free parameters in each fragmentation model are fitted to the data. The extracted parameters and the function itself are compared to measurements from e+e− experiments.
| Original language | Undefined/Unknown |
|---|---|
| Pages (from-to) | 082/1,I-082/15,IX |
| Number of pages | 24 |
| Journal | Journal of High Energy Physics |
| Volume | 04 |
| Publication status | Published - 2009 |