Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-01-06
Nucl.Phys.B849:296-363,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
75 pages, 47 figures. Typos in Tab.2 (N_dat) and Eq.(70) corrected
Scientific paper
10.1016/j.nuclphysb.2011.03.021
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 flavours.
Ball Richard D.
Bertone Valerio
Cerutti Francesco
Debbio Luigi Del
Forte Stefano
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