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- W4295356181 abstract "We investigate how charmonium hadroproduction at fixed-target energies can be used to constrain the gluon distribution in pions. Using nonrelativistic QCD (NRQCD) formulation, the $J/ensuremath{psi}$ and $ensuremath{psi}(2S)$ cross sections as a function of longitudinal momentum fraction ${x}_{F}$ from pions and protons colliding with light targets, as well as the $ensuremath{psi}(2S)$ to $J/ensuremath{psi}$ cross section ratios, are included in the analysis. The color-octet long-distance matrix elements are found to have a pronounced dependence on the pion parton distribution functions (PDFs). This study shows that the ${x}_{F}$ differential cross sections of pion-induced charmonium production impose strong constraints on the pion's quark and gluon PDFs. In particular, the pion PDFs with larger gluon densities provide a significantly better description of the data. It is also found that the production of the $ensuremath{psi}(2S)$ state is associated with a larger quark-antiquark contribution, compared with $J/ensuremath{psi}$." @default.
- W4295356181 created "2022-09-13" @default.
- W4295356181 creator A5014989580 @default.
- W4295356181 creator A5020591260 @default.
- W4295356181 creator A5043334353 @default.
- W4295356181 creator A5080073892 @default.
- W4295356181 date "2023-03-07" @default.
- W4295356181 modified "2023-10-01" @default.
- W4295356181 title "Fixed-target charmonium production and pion parton distributions" @default.
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