https://doi.org/10.1140/epjc/s10052-013-2311-3
Regular Article - Experimental Physics
Combination and QCD analysis of charm production cross section measurements in deep-inelastic ep scattering at HERA
1
I. Physikalisches Institut der RWTH, Aachen, Germany
2
Institute of Physics and Technology of Ministry of Education and Science of Kazakhstan, Almaty, Kazakhstan
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NIKHEF and University of Amsterdam, Amsterdam, Netherlands
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Inter-University Institute for High Energies ULB-VUB, Brussels, Belgium
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Universiteit Antwerpen, Antwerpen, Belgium
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Argonne National Laboratory, Argonne, IL, 60439-4815, USA
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Vinca Institute of Nuclear Sciences, University of Belgrade, 1100, Belgrade, Serbia
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Andrews University, Berrien Springs, MI, 49104-0380, USA
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School of Physics and Astronomy, University of Birmingham, Birmingham, UK
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INFN Bologna, Bologna, Italy
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University and INFN Bologna, Bologna, Italy
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Physikalisches Institut der Universität Bonn, Bonn, Germany
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H.H. Wills Physics Laboratory, University of Bristol, Bristol, UK
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National Institute for Physics and Nuclear Engineering (NIPNE), Bucharest, Romania
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Department of Physics, Panjab University, Chandigarh, India
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Department of Engineering in Management and Finance, Univ. of the Aegean, Chios, Greece
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Physics Department, Ohio State University, Columbus, OH, 43210, USA
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Physics Department and INFN, Calabria University, Cosenza, Italy
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The Henryk Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences, Cracow, Poland
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Department of Physics, Jagellonian University, Cracow, Poland
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Center for High Energy Physics, Kyungpook National University, Daegu, South Korea
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Institut für Physik, TU Dortmund, Dortmund, Germany
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Joint Institute for Nuclear Research, Dubna, Russia
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INFN Florence, Florence, Italy
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University and INFN Florence, Florence, Italy
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Fakultät für Physik der Universität Freiburg i.Br., Freiburg i.Br., Germany
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CEA, DSM/Irfu, CE-Saclay, Gif-sur-Yvette, France
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School of Physics and Astronomy, University of Glasgow, Glasgow, UK
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Institut für Experimentalphysik, Universität Hamburg, Hamburg, Germany
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Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
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Physikalisches Institut, Universität Heidelberg, Heidelberg, Germany
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Kirchhoff-Institut für Physik, Universität Heidelberg, Heidelberg, Germany
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Max-Planck-Institut für Kernphysik, Heidelberg, Germany
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Nevis Laboratories, Columbia University, Irvington on Hudson, NY, 10027, USA
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Institute of Experimental Physics, Slovak Academy of Sciences, Košice, Slovak Republic
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Faculty of Physics and Applied Computer Science, AGH-University of Science and Technology, Krakow, Poland
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Jabatan Fizik, Universiti Malaya, 50603, Kuala Lumpur, Malaysia
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Institute for Universe and Elementary Particles, Chonnam National University, Kwangju, South Korea
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Institute for Nuclear Research, National Academy of Sciences, Kyiv, Ukraine
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Department of Nuclear Physics, National Taras Shevchenko University of Kyiv, Kyiv, Ukraine
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Department of Physics, University of Lancaster, Lancaster, UK
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Department of Physics, University of Liverpool, Liverpool, UK
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School of Physics and Astronomy, Queen Mary, University of London, London, UK
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High Energy Nuclear Physics Group, Imperial College London, London, UK
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Physics and Astronomy Department, University College London, London, UK
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Institut de Physique Nucléaire, Université Catholique de Louvain, Louvain-la-Neuve, Belgium
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Physics Department, University of Lund, Lund, Sweden
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Departamento de Fisica, CINVESTAV IPN, México City, México
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Department of Physics, University of Wisconsin, Madison, WI, 53706, USA
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Departamento de Física Teórica, Universidad Autónoma de Madrid, Madrid, Spain
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CPPM, Aix-Marseille Univ, CNRS/IN2P3, 13288, Marseille, France
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Department of Physics, McGill University, Montréal, Québec, Canada H3A 2T8,
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Institute for Theoretical and Experimental Physics, Moscow, Russia
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Lebedev Physical Institute, Moscow, Russia
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Moscow Engineering Physics Institute, Moscow, Russia
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Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow, Russia
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Max-Planck-Institut für Physik, Munich, Germany
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LAL, Université Paris-Sud, CNRS/IN2P3, Orsay, France
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Department of Physics, University of Oxford, Oxford, UK
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STFC, Rutherford Appleton Laboratory, Didcot, Oxfordshire, UK
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INFN Padova, Padova, Italy
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Dipartimento di Fisica dell’ Università and INFN, Padova, Italy
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LLR, Ecole Polytechnique, CNRS/IN2P3, Palaiseau, France
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Faculty of Science, University of Montenegro, Podgorica, Montenegro
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Institute of Physics of the Academy of Sciences of the Czech Republic, Praha, Czech Republic
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Faculty of Mathematics and Physics of Charles University, Prague, Czech Republic
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Department of Particle Physics and Astrophysics, Weizmann Institute, Rehovot, Israel
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Dipartimento di Fisica Università di Roma Tre and INFN Roma 3, Rome, Italy
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Dipartimento di Fisica, Università ‘La Sapienza’ and INFN, Rome, Italy
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Institute for Nuclear Research and Nuclear Energy, Sofia, Bulgaria
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Raymond and Beverly Sackler Faculty of Exact Sciences, School of Physics, Tel Aviv University, Tel Aviv, Israel
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Polytechnic University, Tokyo, Japan
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Department of Physics, Tokyo Institute of Technology, Tokyo, Japan
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Department of Physics, University of Tokyo, Tokyo, Japan
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Department of Physics, Tokyo Metropolitan University, Tokyo, Japan
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Università di Torino and INFN, Torino, Italy
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Università del Piemonte Orientale, Novara, Italy
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INFN, Torino, Italy
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Department of Physics, University of Toronto, Toronto, Ontario, Canada M5S 1A7,
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Institute of Particle and Nuclear Studies, KEK, Tsukuba, Japan
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Institute of Physics and Technology of the Mongolian Academy of Sciences, Ulaanbaatar, Mongolia
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Department of Physics, Pennsylvania State University, University Park, PA, 16802, USA
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Paul Scherrer Institut, Villigen, Switzerland
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Faculty of Physics, University of Warsaw, Warsaw, Poland
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National Centre for Nuclear Research, Warsaw, Poland
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Fachbereich C, Universität Wuppertal, Wuppertal, Germany
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Yerevan Physics Institute, Yerevan, Armenia
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Faculty of General Education, Meiji Gakuin University, Yokohama, Japan
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Department of Physics, York University, Toronto, Ontario, Canada M3J 1P3,
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Departamento de Fisica Aplicada, CINVESTAV, Mérida, Yucatán, México
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Deutsches Elektronen-Synchrotron DESY, Zeuthen, Germany
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Institut für Teilchenphysik, ETH, Zurich, Switzerland
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Physik-Institut der Universität Zürich, Zurich, Switzerland
* e-mail: levy@alzt.tau.ac.il
Received:
5
November
2012
Revised:
30
January
2013
Published online:
20
February
2013
Measurements of open charm production cross sections in deep-inelastic ep scattering at HERA from the H1 and ZEUS Collaborations are combined. Reduced cross sections 
for charm production are obtained in the kinematic range of photon virtuality 2.5≤Q
2≤2000 GeV2 and Bjorken scaling variable 3⋅10−5≤x≤5⋅10−2. The combination method accounts for the correlations of the systematic uncertainties among the different data sets. The combined charm data together with the combined inclusive deep-inelastic scattering cross sections from HERA are used as input for a detailed NLO QCD analysis to study the influence of different heavy flavour schemes on the parton distribution functions. The optimal values of the charm mass as a parameter in these different schemes are obtained. The implications on the NLO predictions for W
± and Z production cross sections at the LHC are investigated. Using the fixed flavour number scheme, the running mass of the charm quark is determined.
© Springer-Verlag Berlin Heidelberg and Società Italiana di Fisica, 2013
