2009/11/30 by Hee Sok Chung, Seyong Kim, Jungil Lee +1
Mathematics · Physics and Astronomy · #Algorithm #High-Energy Particle Collisions Research #Mathematics #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1103/physrevd.81.014020
published as Phys.Rev.D81:014020,2010 · 5 pages, 2 figures, minor corrections, version published in Phys. Rev. D
arxiv created 2010/01/15 · openalex publication_date 2010/01/22 · arxiv updated 2010/03/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Within the framework of the nonrelativistic QCD (NRQCD) factorization approach, we compute the polarization of prompt J/\ensuremathψ produced at the Brookhaven's Relativistic Heavy-Ion Collider from proton-proton collisions at the center-of-momentum energy √(s)=200 GeV. The perturbative contributions are computed at leading order in the strong coupling constant. The prediction reveals that the color-singlet contribution severely underestimates the PHENIX preliminary data for the differential cross section integrated over the rapidity range |y|<0.35 and its contribution is strongly transversely polarized, which disagrees with the PHENIX preliminary data. After including the color-octet contributions, we find that the NRQCD predictions for both the cross section and polarization over the transverse-momentum range 1.5 GeV<pT<5 GeV (1.5 GeV<pT<2 GeV) integrated over the rapidity range |y|<0.35 (1.2<|y|<2.2) agree with the data within errors.