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
3
NIKHEF and University of Amsterdam, Amsterdam, Netherlands
4
Inter-University Institute for High Energies ULB-VUB, Brussels, Belgium
5
Universiteit Antwerpen, Antwerpen, Belgium
6
Argonne National Laboratory, Argonne, IL, 60439-4815, USA
7
Vinca Institute of Nuclear Sciences, University of Belgrade, 1100, Belgrade, Serbia
8
Andrews University, Berrien Springs, MI, 49104-0380, USA
9
School of Physics and Astronomy, University of Birmingham, Birmingham, UK
10
INFN Bologna, Bologna, Italy
11
University and INFN Bologna, Bologna, Italy
12
Physikalisches Institut der Universität Bonn, Bonn, Germany
13
H.H. Wills Physics Laboratory, University of Bristol, Bristol, UK
14
National Institute for Physics and Nuclear Engineering (NIPNE), Bucharest, Romania
15
Department of Physics, Panjab University, Chandigarh, India
16
Department of Engineering in Management and Finance, Univ. of the Aegean, Chios, Greece
17
Physics Department, Ohio State University, Columbus, OH, 43210, USA
18
Physics Department and INFN, Calabria University, Cosenza, Italy
19
The Henryk Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences, Cracow, Poland
20
Department of Physics, Jagellonian University, Cracow, Poland
21
Center for High Energy Physics, Kyungpook National University, Daegu, South Korea
22
Institut für Physik, TU Dortmund, Dortmund, Germany
23
Joint Institute for Nuclear Research, Dubna, Russia
24
INFN Florence, Florence, Italy
25
University and INFN Florence, Florence, Italy
26
Fakultät für Physik der Universität Freiburg i.Br., Freiburg i.Br., Germany
27
CEA, DSM/Irfu, CE-Saclay, Gif-sur-Yvette, France
28
School of Physics and Astronomy, University of Glasgow, Glasgow, UK
29
Institut für Experimentalphysik, Universität Hamburg, Hamburg, Germany
30
Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
31
Physikalisches Institut, Universität Heidelberg, Heidelberg, Germany
32
Kirchhoff-Institut für Physik, Universität Heidelberg, Heidelberg, Germany
33
Max-Planck-Institut für Kernphysik, Heidelberg, Germany
34
Nevis Laboratories, Columbia University, Irvington on Hudson, NY, 10027, USA
35
Institute of Experimental Physics, Slovak Academy of Sciences, Košice, Slovak Republic
36
Faculty of Physics and Applied Computer Science, AGH-University of Science and Technology, Krakow, Poland
37
Jabatan Fizik, Universiti Malaya, 50603, Kuala Lumpur, Malaysia
38
Institute for Universe and Elementary Particles, Chonnam National University, Kwangju, South Korea
39
Institute for Nuclear Research, National Academy of Sciences, Kyiv, Ukraine
40
Department of Nuclear Physics, National Taras Shevchenko University of Kyiv, Kyiv, Ukraine
41
Department of Physics, University of Lancaster, Lancaster, UK
42
Department of Physics, University of Liverpool, Liverpool, UK
43
School of Physics and Astronomy, Queen Mary, University of London, London, UK
44
High Energy Nuclear Physics Group, Imperial College London, London, UK
45
Physics and Astronomy Department, University College London, London, UK
46
Institut de Physique Nucléaire, Université Catholique de Louvain, Louvain-la-Neuve, Belgium
47
Physics Department, University of Lund, Lund, Sweden
48
Departamento de Fisica, CINVESTAV IPN, México City, México
49
Department of Physics, University of Wisconsin, Madison, WI, 53706, USA
50
Departamento de Física Teórica, Universidad Autónoma de Madrid, Madrid, Spain
51
CPPM, Aix-Marseille Univ, CNRS/IN2P3, 13288, Marseille, France
52
Department of Physics, McGill University, Montréal, Québec, Canada H3A 2T8,
53
Institute for Theoretical and Experimental Physics, Moscow, Russia
54
Lebedev Physical Institute, Moscow, Russia
55
Moscow Engineering Physics Institute, Moscow, Russia
56
Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow, Russia
57
Max-Planck-Institut für Physik, Munich, Germany
58
LAL, Université Paris-Sud, CNRS/IN2P3, Orsay, France
59
Department of Physics, University of Oxford, Oxford, UK
60
STFC, Rutherford Appleton Laboratory, Didcot, Oxfordshire, UK
61
INFN Padova, Padova, Italy
62
Dipartimento di Fisica dell’ Università and INFN, Padova, Italy
63
LLR, Ecole Polytechnique, CNRS/IN2P3, Palaiseau, France
64
Faculty of Science, University of Montenegro, Podgorica, Montenegro
65
Institute of Physics of the Academy of Sciences of the Czech Republic, Praha, Czech Republic
66
Faculty of Mathematics and Physics of Charles University, Prague, Czech Republic
67
Department of Particle Physics and Astrophysics, Weizmann Institute, Rehovot, Israel
68
Dipartimento di Fisica Università di Roma Tre and INFN Roma 3, Rome, Italy
69
Dipartimento di Fisica, Università ‘La Sapienza’ and INFN, Rome, Italy
70
Institute for Nuclear Research and Nuclear Energy, Sofia, Bulgaria
71
Raymond and Beverly Sackler Faculty of Exact Sciences, School of Physics, Tel Aviv University, Tel Aviv, Israel
72
Polytechnic University, Tokyo, Japan
73
Department of Physics, Tokyo Institute of Technology, Tokyo, Japan
74
Department of Physics, University of Tokyo, Tokyo, Japan
75
Department of Physics, Tokyo Metropolitan University, Tokyo, Japan
76
Università di Torino and INFN, Torino, Italy
77
Università del Piemonte Orientale, Novara, Italy
78
INFN, Torino, Italy
79
Department of Physics, University of Toronto, Toronto, Ontario, Canada M5S 1A7,
80
Institute of Particle and Nuclear Studies, KEK, Tsukuba, Japan
81
Institute of Physics and Technology of the Mongolian Academy of Sciences, Ulaanbaatar, Mongolia
82
Department of Physics, Pennsylvania State University, University Park, PA, 16802, USA
83
Paul Scherrer Institut, Villigen, Switzerland
84
Faculty of Physics, University of Warsaw, Warsaw, Poland
85
National Centre for Nuclear Research, Warsaw, Poland
86
Fachbereich C, Universität Wuppertal, Wuppertal, Germany
87
Yerevan Physics Institute, Yerevan, Armenia
88
Faculty of General Education, Meiji Gakuin University, Yokohama, Japan
89
Department of Physics, York University, Toronto, Ontario, Canada M3J 1P3,
90
Departamento de Fisica Aplicada, CINVESTAV, Mérida, Yucatán, México
91
Deutsches Elektronen-Synchrotron DESY, Zeuthen, Germany
92
Institut für Teilchenphysik, ETH, Zurich, Switzerland
93
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