Combination and QCD analysis of charm production cross section measurements in deep-inelastic ep scattering at HERA
ZEUS Collaboration (ukupan broj autora: 486)
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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 sigma(c (c) over bar)(red) for charm production are obtained in the kinematic range of photon virtuality 2.5 LT = Q(2) LT = 2000 GeV2 and Bjorken scaling variable 3 . 10(-5) LT = x LT = 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.
Извор:European Physical Journal C. Particles and Fields, 2013, 73, 2
- Initiative and Networking Fund of the Helmholtz Association (HGF) [VH-NG-401], Max Planck Institute for Physics, Munich, Germany, Polish National Science Centre [DEC-2011/01/BST2/03643], Warsaw University, Poland, DESY, Germany, Russian Foundation for Basic Research [11-02-91345-DFG_a], National Science Foundation, Bundesministerium fur Bildung und Forschung, FRG [05H09GUF, 05H09VHC, 05H09VHF, 05H16PEA], FNRS-FWO-Vlaanderen, IISN-IIKW, IWT, Interuniversity Attraction Poles Programme, Belgian Science Policy, Polish Ministry of Science and Higher Education [DPN/N168/DESY/2009, DPN/N188/DESY/2009], VEGA SR grant [2/7062/27], Swedish Natural Science Research Council, Ministry of Education of the Czech Republic [LC527, INGO-LA09042, MSM0021620859], Swiss National Science Foundation, CONACYT, Mexico [48778-F], Russian Foundation for Basic Research (RFBR) [1329.2008.2], DESY directorate, [1 P03B 04529]