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Article Dans Une Revue Phys.Rev.D Année : 2023

Fixed-target charmonium production and pion parton distributions

Résumé

We investigate how charmonium hadroproduction at fixed-target energies can be used to constrain the gluon distribution in pion. Using non-relativistic QCD (NRQCD) formulation, the $J/\psi$ and $\psi(2S)$ cross sections as a function of longitudinal momentum fraction $x_F$ from pions and protons colliding with light targets, as well as the $\psi(2S)$ to $J/\psi$ 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 $\psi(2S)$ state is associated with a larger quark-antiquark contribution, compared with $J/\psi$.

Dates et versions

hal-03790744 , version 1 (28-09-2022)

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Wen-Chen Chang, Jen-Chieh Peng, Stephane Platchkov, Takahiro Sawada. Fixed-target charmonium production and pion parton distributions. Phys.Rev.D, 2023, 107 (5), pp.056008. ⟨10.1103/PhysRevD.107.056008⟩. ⟨hal-03790744⟩
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