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Measurement of the charm fragmentation function in D* photoproduction at HERA

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ZEUS Collaboration



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.

Keywords

Lepton-Nucleon Scattering

 

E-print Number: 0901.1210

Cited: by |

Refers: to

PACS

13.60.Le Meson production

13.25.Ft Decays of charmed mesons

14.40.Lb Charmed mesons

12.38.Lg Other nonperturbative calculations

Subjects

Particle physics and field theory

Dates

Issue 04 (April 2009)

Received 7 February 2009, accepted for publication 31 March 2009

Published 21 April 2009



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