Progress in the Neural Network Determination of Polarized Parton Distributions

Details Progress in the Neural Network Determination of Polarized Parton Distributions Progress in the Neural Network Determination of Polarized Parton Distributions

2010-07-02

arxiv.org/abs/1007.0351v1

PoS DIS2010:244,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 2 figures; to appear in the proceedings of DIS 2010, Firenze

Scientific paper

We review recent progress towards a determination of a set of polarized parton distributions from a global set of deep-inelastic scattering data based on the NNPDF methodology, in analogy with the unpolarized case. This method is designed to provide a faithful and statistically sound representation of parton distributions and their uncertainties. We show how the FastKernel method provides a fast and accurate method for solving the polarized DGLAP equations. We discuss the polarized PDF parametrizations and the physical constraints which can be imposed. Preliminary results suggest that the uncertainty on polarized PDFs, most notably the gluon, has been underestimated in previous studies.

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