https://doi.org/10.1140/epjc/s10052-008-0792-2
Regular Article - Experimental Physics
Study of charm fragmentation into D * ± mesons in deep-inelastic scattering at HERA
1
I. Physikalisches Institut der RWTH, Aachen, Germany
2
Vinca Institute of Nuclear Sciences, Belgrade, Serbia
3
School of Physics and Astronomy, University of Birmingham, Birmingham, UK
4
Inter-University Institute for High Energies ULB-VUB, Brussels, Belgium
5
Universiteit Antwerpen, Antwerpen, Belgium
6
National Institute for Physics and Nuclear Engineering (NIPNE), Bucharest, Romania
7
Rutherford Appleton Laboratory, Chilton, Didcot, UK
8
Institute for Nuclear Physics, Cracow, Poland
9
Institut für Physik, TU Dortmund, Dortmund, Germany
10
Joint Institute for Nuclear Research, Dubna, Russia
11
CEA, DSM/Irfu, CE-Saclay, Gif-sur-Yvette, France
12
DESY, Hamburg, Germany
13
Institut für Experimentalphysik, Universität Hamburg, Hamburg, Germany
14
Max-Planck-Institut für Kernphysik, Heidelberg, Germany
15
Physikalisches Institut, Universität Heidelberg, Heidelberg, Germany
16
Kirchhoff-Institut für Physik, Universität Heidelberg, Heidelberg, Germany
17
Institute of Experimental Physics, Slovak Academy of Sciences, Košice, Slovak Republic
18
Department of Physics, University of Lancaster, Lancaster, UK
19
Department of Physics, University of Liverpool, Liverpool, UK
20
Queen Mary and Westfield College, London, UK
21
Physics Department, University of Lund, Lund, Sweden
22
CPPM, CNRS/IN2P3–Univ. Mediterranee, Marseille, France
23
Departamento de Fisica Aplicada, CINVESTAV, Mérida, Yucatán, Mexico
24
Departamento de Fisica, CINVESTAV, México, Mexico
25
Institute for Theoretical and Experimental Physics, Moscow, Russia
26
Lebedev Physical Institute, Moscow, Russia
27
Max-Planck-Institut für Physik, München, Germany
28
LAL, Univ Paris-Sud, CNRS/IN2P3, Orsay, France
29
LLR, Ecole Polytechnique, IN2P3-CNRS, Palaiseau, France
30
LPNHE, Universités Paris VI and VII, IN2P3-CNRS, Paris, France
31
Faculty of Science, University of Montenegro, Podgorica, Montenegro
32
Institute of Physics, Academy of Sciences of the Czech Republic, Praha, Czech Republic
33
Faculty of Mathematics and Physics, Charles University, Praha, Czech Republic
34
Dipartimento di Fisica Università di Roma Tre and INFN Roma 3, Roma, Italy
35
Institute for Nuclear Research and Nuclear Energy, Sofia, Bulgaria
36
Institute of Physics and Technology of the Mongolian Academy of Sciences, Ulaanbaatar, Mongolia
37
Paul Scherrer Institut, Villigen, Switzerland
38
Fachbereich C, Universität Wuppertal, Wuppertal, Germany
39
Yerevan Physics Institute, Yerevan, Armenia
40
DESY, Zeuthen, Germany
41
Institut für Teilchenphysik, ETH, Zürich, Switzerland
42
Physik-Institut der Universität Zürich, Zürich, Switzerland
* e-mail: schoning@mail.desy.de
Received:
7
August
2008
Revised:
17
October
2008
Published online:
18
December
2008
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.
© Springer-Verlag , 2009