Parton distributions with QED corrections
Abstract
We present a set of parton distribution functions (PDFs), based on the NNPDF2.3 set, which includes a photon PDF, and QED contributions to parton evolution. We describe the implementation of the combined QCD+QED evolution in the NNPDF framework. We then provide a first determination of the full set of PDFs based on deep-inelastic scattering data and LHC data for W and Z/gamma* Drell-Yan production, using leading-order QED and NLO or NNLO QCD. We compare the ensuing NNPDF2.3QED PDF set to the older MRST2004QED set. We perform a preliminary investigation of the phenomenological implications of NNPDF2.3QED: specifically, photon-induced corrections to direct photon production at HERA, and high-mass dilepton and W pair production at the LHC.
Cite
@article{arxiv.1308.0598,
title = {Parton distributions with QED corrections},
author = {The NNPDF Collaboration and Richard D. Ball and Valerio Bertone and Stefano Carrazza and Luigi Del Debbio and Stefano Forte and Alberto Guffanti and Nathan P. Hartland and Juan Rojo},
journal= {arXiv preprint arXiv:1308.0598},
year = {2021}
}
Comments
38 pages, 27 figures. Final version, to be published in Nucl. Phys. B. Several corrections and improvements, in particular Fig.5 added, Fig.2, Fig. 6 and Fig.8 improved, Fig.21 corrected