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

Abstract

We present an analysis of hadroproduction of $J/\psi$ and $\psi (2S)$ 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 $q\bar{q}$ and color-octet processes are significantly enhanced, especially at lower energies. A good agreement between the pion-induced $J/\psi$ 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 $x$.

20 pages, 6 figures, published version

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Cited by in corpus (3)

• Fixed-target charmonium production and pion parton distributions
• Pion PDFs confronted by Fixed-Target Charmonium Production
• Probing Pion Valence Quark Distribution with Beam-charge Asymmetry of Pion-induced $J/\psi$ Production