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Abstract
The process of charm quark fragmentation is studied using D* ± meson production in deep-inelastic scattering as measured by the H1 detector at HERA. The parameters of fragmentation functions are extracted for QCD models based on leading order matrix elements and DGLAP or CCFM evolution of partons together with string fragmentation and particle decays. Additionally, they are determined for a next-to-leading order QCD calculation in the fixed flavour number scheme using the independent fragmentation of charm quarks to D* ± mesons. Two different regions of phase space are investigated defined by the presence or absence of a jet containing the D* ± meson in the event. The fragmentation parameters extracted for the two phase space regions are found to be different.
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1 National Institute for Physics and Nuclear Engineering (NIPNE), Bucharest, Romania
2 Lebedev Physical Institute, Moscow, Russia
3 DESY, Hamburg, Germany
4 Dipartimento di Fisica Università di Roma Tre and INFN Roma 3, Roma, Italy
5 Inter-University Institute for High Energies ULB-VUB, Brussels, Belgium; Universiteit Antwerpen, Antwerpen, Belgium
6 Faculty of Science, University of Montenegro, Podgorica, Montenegro
7 Yerevan Physics Institute, Yerevan, Armenia
8 LPNHE, Universités Paris VI and VII, IN2P3-CNRS, Paris, France
9 Institute of Physics and Technology of the Mongolian Academy of Sciences, Ulaanbaatar, Mongolia
10 Physikalisches Institut, Universität Heidelberg, Heidelberg, Germany
11 Institut für Teilchenphysik, ETH, Zürich, Switzerland
12 LAL, Univ Paris-Sud, CNRS/IN2P3, Orsay, France
13 Institut für Physik, TU Dortmund, Dortmund, Germany
14 LLR, Ecole Polytechnique, IN2P3-CNRS, Palaiseau, France
15 Vinca Institute of Nuclear Sciences, Belgrade, Serbia
16 School of Physics and Astronomy, University of Birmingham, Birmingham, UK
17 Institute of Experimental Physics, Slovak Academy of Sciences, Košice, Slovak Republic
18 Max-Planck-Institut für Kernphysik, Heidelberg, Germany; Yerevan Physics Institute, Yerevan, Armenia
19 Max-Planck-Institut für Physik, München, Germany
20 Institute for Theoretical and Experimental Physics, Moscow, Russia
21 Departamento de Fisica Aplicada, CINVESTAV, Mérida, Yucatán, Mexico
22 CPPM, CNRS/IN2P3–Univ. Mediterranee, Marseille, France
23 Faculty of Mathematics and Physics, Charles University, Praha, Czech Republic
24 Rutherford Appleton Laboratory, Chilton, Didcot, UK
25 CEA, DSM/Irfu, CE-Saclay, Gif-sur-Yvette, France
26 Institute of Physics, Academy of Sciences of the Czech Republic, Praha, Czech Republic
27 Department of Physics, University of Liverpool, Liverpool, UK
28 Fachbereich C, Universität Wuppertal, Wuppertal, Germany
29 Max-Planck-Institut für Kernphysik, Heidelberg, Germany
30 Paul Scherrer Institut, Villigen, Switzerland
31 Institute for Nuclear Physics, Cracow, Poland
32 DESY, Zeuthen, Germany
33 Institut für Experimentalphysik, Universität Hamburg, Hamburg, Germany
34 Physics Department, University of Lund, Lund, Sweden
35 Department of Physics, University of Lancaster, Lancaster, UK
36 Kirchhoff-Institut für Physik, Universität Heidelberg, Heidelberg, Germany
37 Departamento de Fisica, CINVESTAV, México, Mexico
38 Joint Institute for Nuclear Research, Dubna, Russia
39 Queen Mary and Westfield College, London, UK
40 I. Physikalisches Institut der RWTH, Aachen, Germany
41 Physik-Institut der Universität Zürich, Zürich, Switzerland
42 Institute for Nuclear Research and Nuclear Energy, Sofia, Bulgaria
43 DESY, Hamburg, Germany; Physik-Institut der Universität Zürich, Zürich, Switzerland





