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Abstract
Measurements of meson production in diffractive deep inelastic scattering are presented which are based on HERA data recorded at a centre-of-mass energy with an integrated luminosity of 287 pb. The reaction is studied, where the system X, containing at least one meson, is separated from a leading low-mass proton dissociative system Y by a large rapidity gap. The kinematics of candidates are reconstructed in the decay channel. The measured cross sections compare favourably with next-to-leading order QCD predictions, where charm quarks are produced via boson-gluon fusion. The charm quarks are then independently fragmented to the mesons. The calculations rely on the collinear factorisation theorem and are based on diffractive parton densities previously obtained by H1 from fits to inclusive diffractive cross sections. The data are further used to determine the diffractive to inclusive production ratio in deep inelastic scattering.
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1 Lebedev Physical Institute, Moscow, Russia
2 Yerevan Physics Institute, Yerevan, Armenia
3 Institute of Physics and Technology of the Mongolian, Academy of Sciences, Ulaanbaatar, Mongolia
4 Physikalisches Institut, Universität Heidelberg, Heidelberg, Germany
5 LLR, Ecole Polytechnique, CNRS/IN2P3, Palaiseau, France
6 II. Physikalisches Institut, Universität Göttingen, Göttingen, Germany
7 LAL, Université Paris-Sud, CNRS/IN2P3, Orsay, France
8 DESY, Hamburg, Germany
9 School of Physics and Astronomy, University of Birmingham, Birmingham, UK
10 Moscow Institute of Physics and Technology, Dolgoprudny, Moscow Region, Russian Federation
11 Institute for Theoretical and Experimental Physics, Moscow, Russia
12 Departamento de Fisica Aplicada, CINVESTAV, Mérida, Yucatán, Mexico
13 Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic
14 Max-Planck-Institut für Physik, Munich, Germany
15 Institute of Physics, Academy of Sciences of the Czech Republic, Prague, Czech Republic
16 Department of Physics, University of Liverpool, Liverpool, UK
17 Fachbereich C, Universität Wuppertal, Wuppertal, Germany
18 Aix Marseille Université, CNRS/IN2P3, CPPM UMR 7346, Marseille, France
19 Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering (IFIN-HH), Bucharest, Romania
20 Paul Scherrer Institute, Villigen, Switzerland
21 Inter-University Institute for High Energies ULB-VUB, Brussels and Universiteit Antwerpen, Antwerp, Belgium
22 Irfu/SPP, CE Saclay, Gif-sur-Yvette, France
23 Nuclear Physics Institute of the CAS, Řež, Czech Republic
24 Institute of Nuclear Physics, Polish Academy of Sciences, Kraków, Poland
25 IPNL, Université Claude Bernard Lyon 1, CNRS/IN2P3, Villeurbanne, France
26 Institut für Teilchenphysik, ETH, Zurich, Switzerland
27 Department of Physics, University of Lancaster, Liverpool, UK
28 Joint Institute for Nuclear Research, Dubna, Russia
29 Institut für Experimentalphysik, Universität Hamburg, Hamburg, Germany
30 School of Physics and Astronomy, Queen Mary, University of London, London, UK
31 DESY, Zeuthen, Germany
32 I. Physikalisches Institut der RWTH, Aachen, Germany
33 Physik-Institut der Universität Zürich, Zurich, Switzerland
34 CERN, Geneva, Switzerland
35 Faculty of Science, University of Montenegro, Podgorica, Montenegro
36 Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic; Department of Physics, University of Toronto, Toronto, ON, Canada
37 Department of Physics, Oxford University, Oxford, UK
38 Institute for Information Transmission Problems RAS, Moscow, Russia
39 Rutherford Appleton Laboratory, STFC, Didcot, Oxfordshire, UK
40 Aix Marseille Université, CNRS/IN2P3, CPPM UMR 7346, Marseille, France; LAPP, Université de Savoie, CNRS/IN2P3, Annecy-le-Vieux, France
41 Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow, Russia
42 Dipartimento di Fisica Università di Roma Tre and INFN Roma 3, Rome, Italy
43 Inter-University Institute for High Energies ULB-VUB, Brussels and Universiteit Antwerpen, Antwerp, Belgium; Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic
44 Institute for Nuclear Research and Nuclear Energy, Sofia, Bulgaria
45 Institute of Physics and Technology of the Mongolian, Academy of Sciences, Ulaanbaatar, Mongolia; Ulaanbaatar University, Ulaanbaatar, Mongolia
46 Institut für Physik, TU Dortmund, Dortmund, Germany





