Measurement of the charm fragmentation function in D* photoproduction at HERA
(2009) Journal of High Energy Physics — Vol. 4, p. 82 (2009)
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- et. al.
- Abstract
- (en) 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*}/2E{jet}, 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 E{jet}. 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. Comment: 19 pages, 5 figures, 3 tables, accepted by JHEP. New version including small textual clarifications in response to journal referee
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Piotrzkowski, K., Chekanov, S., de Favereau, J., & et al. (2009). Measurement of the charm fragmentation function in D* photoproduction at HERA. Journal of High Energy Physics, 4, 82. https://doi.org/10.1088/1126-6708/2009/04/082 (Original work published 2009)