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Polarized Parton Distributions at an Electron-Ion Collider

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arxiv 1310.0461 v2 pith:CDUSV6MK submitted 2013-10-01 hep-ph

Polarized Parton Distributions at an Electron-Ion Collider

The NNPDF Collaboration: Richard D.Ball , Stefano Forte , Alberto Guffanti , Emanuele R.Nocera , Giovanni Ridolfi , Juan Rojo This is my paper
classification hep-ph
keywords polarizedcolliderdatadeep-inelasticdistributionselectron-iongluoninclusive
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We study the potential impact of inclusive deep-inelastic scattering data from a future electron-ion collider (EIC) on longitudinally polarized parton distribution (PDFs). We perform a PDF determination using the NNPDF methodology, based on sets of deep-inelastic EIC pseudodata, for different realistic choices of the electron and proton beam energies. We compare the results to our current polarized PDF set, NNPDFpol1.0, based on a fit to fixed-target inclusive DIS data. We show that the uncertainties on the first moments of the polarized quark singlet and gluon distributions are substantially reduced in comparison to NNPDFpol1.0, but also that more measurements may be needed to ultimately pin down the size of the gluon contribution to the nucleon spin.

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    Modern global QCD analyses agree that up-quark helicity is positive and down-quark helicity negative, with positive gluon polarisation at moderate x, while the full gluon spin moment remains limited by the unmeasured ...