We present preliminary results on the determination of spin-dependent, or polarised, Parton Distribution Functions (PDFs) from all relevant inclusive polarised DIS data. The analysis is performed within the NNPDF approach, which provides a faithful and statistically sound representation of PDFs and their uncertainties. We describe how the NNPDF methodology has been extended to the polarised case, and compare our results with other recent polarised parton sets. We show that polarised PDF uncertainties can be sizeably underestimated in standard determinations, most notably for the gluon.
Unbiased polarised parton distribution functions and their uncertainties / E. Nocera, S. Forte, G. Ridolfi, J. Rojo - In: 20. International workshop on deep-inelastic scattering and related subjects : DIS 2012 : Bonn, Germany, 26-30 March, 2012 / [a cura di] I.C. Brock. - Hamburg : Deutsche Elektronen-Synchrotron, 2012 Jun 01. - ISBN 9783935702676. - pp. 937-942 (( Intervento presentato al 20. convegno International workshop on deep-inelastic scattering and related subjects : DIS tenutosi a Bonn nel 2012 [10.3204/DESY-PROC-2012-02/273].
Unbiased polarised parton distribution functions and their uncertainties
S. ForteSecondo
;
2012
Abstract
We present preliminary results on the determination of spin-dependent, or polarised, Parton Distribution Functions (PDFs) from all relevant inclusive polarised DIS data. The analysis is performed within the NNPDF approach, which provides a faithful and statistically sound representation of PDFs and their uncertainties. We describe how the NNPDF methodology has been extended to the polarised case, and compare our results with other recent polarised parton sets. We show that polarised PDF uncertainties can be sizeably underestimated in standard determinations, most notably for the gluon.
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