We present a first global determination of spin-dependent parton distribution functions (PDFs) and their uncertainties using the NNPDF methodology: NNPDFpol1.1. Longitudinally polarized deep-inelastic scattering data, already used for the previous NNPDFpol1.0 PDF set, are supplemented with the most recent polarized hadron collider data for inclusive jet and W boson production from the STAR and PHENIX experiments at RHIC, and with open-charm production data from the COMPASS experiment, thereby allowing for a separate determination of the polarized quark and anti-quark PDFs, and an improved determination of the medium- and large-x polarized gluon PDF. We study the phenomenological implications of the NNPDFpol1.1 set, and we provide predictions for the longitudinal double-spin asymmetry for semi-inclusive pion production at RHIC.
@article{arxiv.1406.5539,
title = {A first unbiased global determination of polarized PDFs and their uncertainties},
author = {Emanuele R. Nocera and Richard D. Ball and Stefano Forte and Giovanni Ridolfi and Juan Rojo},
journal= {arXiv preprint arXiv:1406.5539},
year = {2015}
}
Comments
36 pages, 16 figures. Final version to be published in Nucl. Phys. B. Small textual improvements and minor typos corrected