26-30 March 2012
University of Bonn
Europe/Berlin timezone

NNPDF determination of polarized parton distributions of the nucleon at NLO

27 Mar 2012, 17:00
20m
Lecture Hall, Institute for Physical Chemistry (University of Bonn)

Lecture Hall, Institute for Physical Chemistry

University of Bonn

Spin physics Spin physics

Speaker

Emanuele Roberto Nocera (Universita degli Studi di Milano and INFN, Milano)

Description

We present a preliminary determination of a set of polarized parton distributions of the nucleon, at next-to-leading order, from a global set of deep-inelastic scattering data. The determination is based on the NNPDF methodology: a Monte Carlo sampling with neural networks used as unbiased interpolants. This method, which has already been applied to a determination of unpolarized parton distributions, is designed to provide a faithful and statistically sound representation of the uncertainty on parton distributions. We discuss the general NNPDF procedure to parton fitting, focusing on the algorithm used to determine the optimal fit. We also present a preliminary set of polarized PDFs, compared to other parton extractions recently obtained by other collaborations. In particular, we show that "traditional" fits tend to underestimate the PDF uncertainty, particularly for the gluon, which is basically unconstrained by inclusive DIS data.

Primary author

Emanuele Roberto Nocera (Universita degli Studi di Milano and INFN, Milano)

Presentation Materials