Combination and QCD analysis of charm production cross section measurements in deep-inelastic ep scattering at HERA

H. Abramowicz, Iris Abt, L. Adamczyk, M. Adamus, Ritu Aggarwal, C. Alexa, V. Andreev, S. Antonelli, P. Antonioli, А. Антонов

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M. Arneodo, O. Arslan, V. Aushev, Y. Aushev, O. Bachynska, A. Baghdasaryan, S. Baghdasaryan, A. Bamberger, A.N. Barakbaev, G. Barbagli, Giacomo Bari, Fernando Barreiro, W. Bartel, N. Bartosik, D. Bartsch, M. Basile, Khurelbaatar Begzsuren, O. Behnke, J. K. Behr, U. Behrens, L. Bellagamba, A. Belousov, P. Belov, A. Bertolin, S. Bhadra, M. Bindi, C. Blohm, V. Bokhonov, Kyrylo Bondarenko, E. Boos, K. Borras, D. Boscherini, D. Bot, V. Boudry, I. Božović-Jelisavc̆ić, T. Bołd, N.C. Brümmer, J. Braciník, G. Brandt, M. Brinkmann, V. Brisson, D. Britzger, Ian C. Brock, E. Brownson, R. Brugnera, A. Bruni, G. Bruni, B. Brzozowska, Armen Bunyatyan, Peter John Bussey, A. Bylinkin, Ben Bylsma, L. Bystritskaya, Allen Christopher Caldwell, A. Campbell, K. B. Cantun Avila, M. Capua, R. Carlin, C. D. Catterall, F. Ceccopieri, K. Černý, Sergei V. Chekanov, Vladimir Chekelian, J. J. Chwastowski, J. Ciborowski, R. Ciesielski, L. Cifarelli, F. Cindolo, A. Contin, J.G. Contreras, A. M. Cooper-Sarkar, N. Coppola, M. Corradi, F. Corriveau, M. Costa, J. Cvach, G. D’Agostini, John B. Dainton, F. Dal Corso, K. Daum, J. Delvax, R. K. Dementiev, Malcolm Derrick, R.C.E. Devenish, S. De Pasquale, E. A. De Wolf, J. Del Peso, CRISTINEL DIACONU, M. Dobre, D. Dobur, S. Dusini, J. Figiel, A. M. Fomenko, E. Gallo, L. Görlich, T. Greenshaw, Grzegorz Grzelak, O. Gueta, M. P. Guzik, Claire Gwenlan, Dirk Hoffmann, M. Kaur, Prabhdeep Kaur, Salvatore Fazio, E. ̃Tassi, B. Pawlik, P. Stopa, M. Przybycień, Matthew Wing, Aleksander Filip Zarnecki, M. Lisovyi, E. M. Lobodzinska

The European Physical Journal C, 2013

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DOI 10.1140/epjc/s10052-013-2311-3
Data confidence 85 high
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Abstract

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 σcc¯red 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.