Fixed-target charmonium production and pion parton distributions

被引：8

作者：

Chang, Wen-Chen ^{[1
]}

Peng, Jen-Chieh ^{[2
]}

Platchkov, Stephane ^{[3
]}

Sawada, Takahiro ^{[4
]}

机构：

[1] Acad Sinica, Inst Phys, Taipei 11529, Taiwan

[2] Univ Illinois, Dept Phys, Urbana, IL 61801 USA

[3] Univ Paris Saclay, IRFU, CEA, F-91191 Gif Sur Yvette, France

[4] Osaka Metropolitan Univ, Nambu Yoichiro Inst Theoret & Expt Phys, Osaka 5588585, Japan

来源：

PHYSICAL REVIEW D | 2023年 / 107卷 / 05期

基金：

美国国家科学基金会;

关键词：

J-PSI PRODUCTION; HADRONIC COLLISIONS; J/PSI-PRODUCTION; CROSS-SECTION; DRELL-YAN; HADROPRODUCTION; PROTON; KAON; UPSILON; GEV/C;

D O I：

10.1103/PhysRevD.107.056008

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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/psi and psi(2S) cross sections as a function of longitudinal momentum fraction xF 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 longdistance matrix elements are found to have a pronounced dependence on the pion parton distribution functions (PDFs). This study shows that the xF 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.

引用

页数：15

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