Pion-nucleus Drell-Yan data as a novel constraint for nuclear PDFs

P. Paakkinen, K.J. Eskola, H. Paukkunen

Research output: Contribution to journalConference articleScientificpeer-review


We have studied the prospects of using the Drell-Yan dilepton process in pion-nucleus collisions as a novel input in the global analysis of nuclear parton distribution functions (nPDFs). In a NLO QCD framework, we find the measured nuclear cross-section ratios from the NA3, NA10 and E615 experiments to be largely insensitive to the pion parton distributions and also compatible with the EPS09 and nCTEQ15 nPDFs. These data sets can thus be, and in EPPS16 have been, included in global nPDF analyses without introducing significant new theoretical uncertainties or tension with the other data. In particular, we explore the constraining power of these data sets on the possible flavour asymmetry in the valence-quark nuclear modifications. Moreover, using the COMPASS kinematics we present predictions for pion charge-difference ratio, a new measurable which could help to further constrain this asymmetry.© 2017 Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0).
Original languageEnglish
Article number205
JournalPoS Proceedings of Science
Number of pages4
Publication statusPublished - 2017
MoE publication typeA4 Article in conference proceedings
EventInternational Workshop on Deep-Inelastic Scattering and Related Subjects - Birmingham, United Kingdom
Duration: 3 Apr 20177 Apr 2017
Conference number: 25

Fields of Science

  • Distribution functions
  • Hadrons
  • Inelastic scattering
  • Uncertainty analysis, Charge difference
  • Dileptons
  • Drell-Yan
  • Global analysis
  • Nuclear cross sections
  • Nuclear modification
  • Nuclear parton distribution functions
  • Parton distributions, Elementary particles
  • 114 Physical sciences

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