The pion, as the Goldstone boson of the strong interaction, is the lightest QCD bound state and responsible for the long-range nucleon-nucleon interaction inside the nucleus. Our knowledge on the pion partonic structure is limited by the existing Drell-Yan data which are primarily sensitive to the pion valence-quark distributions. The recent progress of global analysis of pion's parton distribution functions (PDFs) utilizing various experimental approaches are introduced. From comparisons between the pion-induced J/ψ and ψ(2S) production data with theoretical calculations using the CEM and NRQCD models, we show how these charmonium production data could provide useful constraints on the pion PDFs.
@article{arxiv.2307.02888,
title = {Pion PDFs confronted by Fixed-Target Charmonium Production},
author = {Wen-Chen Chang and Chia-Yu Hsieh and Yu-Shiang Lian and Jen-Chieh Peng and Stephane Platchkov and Takahiro Sawada},
journal= {arXiv preprint arXiv:2307.02888},
year = {2023}
}
Comments
17 pages, 6 figures; invited review. arXiv admin note: text overlap with arXiv:2006.06947, arXiv:2209.04072