Measurement of the charm fragmentation function in D * photoproduction at HERAстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация: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 * /2 E jet , 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 E jet . Jets were reconstructed using the k T 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.