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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Deceased.
Also at Physics Department, National Technical University, Zografou Campus, 15773 Athens, Greece.
Also at Rechenzentrum, Universität Wuppertal, Wuppertal, Germany.
Also at University of P.J. Šafárik, Košice, Slovak Republic.
Also at CERN, Geneva, Switzerland.
Also at Max-Planck-Institut für Physik, München, Germany.
Also at Comenius University, Bratislava, Slovak Republic.
Also at DESY and University Hamburg, Hamburg, Germany.
Also at Faculty of Physics, University of Bucharest, Bucharest, Romania.
Also at Ulaanbaatar University, Ulaanbaatar, Mongolia.
Supported by the Bundesministerium für Bildung und Forschung, FRG, under contract numbers 05 H1 1GUA/1, 05 H1 1PAA/1, 05 H1 1PAB/9, 05 H1 1PEA/6, 05 H1 1VHA/7 and 05 H1 1VHB/5.
Supported by the UK Science and Technology Facilities Council, and formerly by the UK Particle Physics and Astronomy Research Council.
Supported by FNRS-FWO-Vlaanderen, IISN-IIKW and IWT and by Interuniversity Attraction Poles Programme, Belgian Science Policy.
Partially supported by Polish Ministry of Science and Higher Education, grant PBS/DESY/70/2006.
Supported by the Deutsche Forschungsgemeinschaft.
Supported by VEGA SR grant no. 2/7062/27.
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Aaron, F.D., Alexa, C., Andreev, V. et al. Study of charm fragmentation into D * ± mesons in deep-inelastic scattering at HERA. Eur. Phys. J. C 59, 589–606 (2009). https://doi.org/10.1140/epjc/s10052-008-0792-2
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DOI: https://doi.org/10.1140/epjc/s10052-008-0792-2