18-22 October 2021
Matsue, Shimane Prefecture, Japan
Asia/Tokyo timezone

Accessing pion's large-x gluon by fixed-target charmonium production

18 Oct 2021, 21:20
Room 501 (Kunibiki Messe)

Room 501

Kunibiki Messe

Parallel Session Presentation Form factors and GPDs Form Factors and GPDs


Prof. Wen-Chen Chang (Institute of Physics, Academia Sinica)


The pion, as the Goldstone boson of dynamical chiral symmetry breaking of the strong interaction, is the lightest QCD bound state. Because of its light mass, pion plays a dominant role in the long-range nucleon-nucleon interaction. Understanding the pion’s internal structure is important to investigate the low-energy, non-perturbative aspects of QCD. Nevertheless, the uncertainties of partonic density functions (PDFs) of pions are relatively huge due to lacking rest pion targets.

In this talk, we will review recent theoretical and experimental progress of extracting the pion PDFs. Furthermore, we will provide quantitative evidence within the CEM and NRQCD frameworks that the existing pion-induced fixed-target J/psi data, are sensitive to the gluon density of pions, and favor the pion PDFs with relatively large gluon contents at large x.

[1] C.Y. Hsieh, Y.S. Lian, W.C. Chang, J.C. Peng, S. Platchkov, and T. Sawada, Chin. J. Phys. 73, 13 (2021); arXiv:2103.11660.
[2] W.C. Chang, J.C. Peng, S. Platchkov, and T. Sawada, Phys. Rev. D 102, 054024 (2020).Rev. D 99, 014032 (2019); arXiv:2006.06947.

Primary author

Prof. Wen-Chen Chang (Institute of Physics, Academia Sinica)


Prof. Jen-Chieh Peng (University of Illinois) Prof. Stephane Platchkov (IRFU, CEA, Universit\'{e} Paris-Saclay) Prof. Takahiro Sawada (Department of Physics, Osaka City University)

Presentation Materials