期刊
NUCLEAR PHYSICS B
卷 849, 期 2, 页码 296-363出版社
ELSEVIER
DOI: 10.1016/j.nuclphysb.2011.03.021
关键词
Parton distributions; Quantum chromodynamics; LHC; Collider physics
资金
- STFC
- Bundesministerium fur Bildung and Forschung (BmBF) of the Federal Republic of Germany [05H09PAE]
- Spanish MEC [FIS2007-60350]
- European network [MRTN-CT-2006-035505]
- eDIKT initiative
- STFC [ST/J000329/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/J000329/1] Funding Source: researchfish
We present a determination of the parton distributions of the nucleon from a global set of hard scattering data using the NNPDF methodology including heavy quark mass effects: NNPDF2.1. In comparison to the previous NNPDF2.0 parton determination, the dataset is enlarged to include deep-inelastic charm structure function data. We implement the FONLL-A general-mass scheme in the FastKernel framework and assess its accuracy by comparison to the Les Houches heavy quark benchmarks. We discuss the impact on parton distributions of the treatment of the heavy quark masses, and we provide a determination of the uncertainty in the parton distributions due to uncertainty in the masses. We assess the impact of these uncertainties on LHC observables by providing parton sets with different values of the charm and bottom quark masses. Finally, we construct and discuss parton sets with a fixed number of flavors. (C) 2011 Elsevier B.V. All rights reserved.
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