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We present a determination of the parton distributions of the nucleon from aglobal set of hard scattering data using the NNPDF methodology at LO and NNLOin perturbative QCD, thereby generalizing to these orders the NNPDF2.1 NLOparton set. Heavy quark masses are included using the so-called FONLL method,which is benchmarked here at NNLO. We demonstrate the stability of PDFs uponinclusion of NNLO corrections, and we investigate the convergence of theperturbative expansion by comparing LO, NLO and NNLO results. We show that themomentum sum rule can be tested with increasing accuracy at LO, NLO and NNLO.We discuss the impact of NNLO corrections on collider phenomenology,specifically by comparing to recent LHC data. We present PDF determinationsusing a range of values of alpha_s, m_c and m_b. We also present PDFdeterminations based on various subsets of the global dataset, show that theygenerally lead to less accurate phenomenology, and discuss the possibility offuture PDF determinations based on collider data only.

Unbiased global determination of parton distributions and their uncertainties at NNLO and at LO