Impact of heavy-flavour production cross sections measured by the LHCb experiment on parton distribution functions at low x

Zenaiev, O. (DESY Hamburg and Zeuthen, Hamburg, Germany) ; Geiser, A. (DESY Hamburg and Zeuthen, Hamburg, Germany) ; Lipka, K. (DESY Hamburg and Zeuthen, Hamburg, Germany) ; Blümlein, J. (DESY Hamburg and Zeuthen, Hamburg, Germany) ; Cooper-Sarkar, A. (University of Oxford, Oxford, UK) ; Garzelli, M.-V. (Universität Hamburg, Hamburg, Germany) ; Guzzi, M. (School of Physics and Astronomy, The University of Manchester, Manchester, UK) ; Kuprash, O. (DESY Hamburg and Zeuthen, Hamburg, Germany) ; Moch, S.-O. (Universität Hamburg, Hamburg, Germany) ; Nadolsky, P. (Southern Methodist University, Dallas, TX, USA) ; Placakyte, R. (DESY Hamburg and Zeuthen, Hamburg, Germany) ; Rabbertz, K. (Karlsruher Institut für Technologie, Karlsruhe, Germany) ; Schienbein, I. (LPSC Grenoble, Grenoble, France) ; Starovoitov, P. (DESY Hamburg and Zeuthen, Hamburg, Germany)

26 August 2015

Abstract: The impact of recent measurements of heavy-flavour production in deep inelastic ep scattering and in pp collisions on parton distribution functions is studied in a QCD analysis in the fixed-flavour number scheme at next-to-leading order. Differential cross sections of charm- and beauty-hadron production measured by LHCb are used together with inclusive and heavy-flavour production cross sections in deep inelastic scattering at HERA. The heavy-flavour data of the LHCb experiment impose additional constraints on the gluon and the sea-quark distributions at low partonic fractions x of the proton momentum, down to x∼5×10-6 . This kinematic range is currently not covered by other experimental data in perturbative QCD fits.


Published in: EPJC 75 (2015) 396
Published by: Springer/Società Italiana di Fisica
DOI: 10.1140/epjc/s10052-015-3618-z
License: CC-BY-3.0



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