NRQCD analysis of charmonium production with pion and proton beams at fixed-target energies

Chia Yu Hsieh, Yu Shiang Lian, Wen Chen Chang, Jen Chieh Peng, Stephane Platchkov, Takahiro Sawada

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

We present an analysis of hadroproduction of J∕ψ and ψ(2S) at fixed-target energies in the framework of non-relativistic QCD (NRQCD). Using both pion- and proton-induced data, a new determination of the color-octet long-distance matrix elements (LDMEs) is obtained. Compared with previous results, the contributions from the qq̄ and color-octet processes are significantly enhanced, especially at lower energies. A good agreement between the pion-induced J∕ψ production data and NRQCD calculations using the newly obtained LDMEs is achieved. We find that the pion-induced charmonium production data are sensitive to the gluon density of pions, and favor pion PDFs with relatively large gluon contents at large x.

Original languageEnglish
Pages (from-to)13-23
Number of pages11
JournalChinese Journal of Physics
Volume73
DOIs
StatePublished - Oct 2021

Keywords

  • Charmonium production
  • Color-octet matrix elements
  • Gluon
  • NRQCD
  • Pion PDFs

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