Polarization of prompt J/psi in proton-proton collisions at RHIC

Abstract

Within the framework of the nonrelativistic QCD (NRQCD) factorization approach, we compute the polarization of prompt J/psi produced at the Brookhaven's Relativistic Heavy-Ion Collider from proton-proton collisions at the center-of-momentum energy sqrt{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 < p_T < 5 GeV (1.5 GeV < p_T < 2 GeV) integrated over the rapidity range |y|<0.35 (1.2 < |y| < 2.2) agree with the data within errors.

5 pages, 2 figures, minor corrections, version published in Phys. Rev. D

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Cited by in corpus (12)

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• MARTINI for heavy quarks: initialization, parton evolution, and hadronization with event generation
• QCD corrections to J/psi polarisation in pp collisions at RHIC
• Quarkonium production in high energy proton-proton and proton-nucleus collisions
• Inclusive production of $J/\psi$, $\psi (2S)$, and ${\rm Y}$ states in pNRQCD
• $J/\psi$ polarization in p+p collisions at $\sqrt{s}$ = 200 GeV in STAR
• J/$\psi$ and $\psi (2S)$ measurement in $p$+$p$ collisions at $\sqrt{s}=$ 200 and 500 GeV in the STAR experiment
• Polarization of prompt J/psi in pp -> J/psi+X at sqrt{s}=200 GeV
• $J/\psi$ and $\psi$(2S) polarization in proton-proton collisions at energies available at the CERN Large Hadron Collider using PYTHIA8
• Quarkonia production in the STAR experiment
• ${\chi }_{cJ}$ Polarization in Polarized Proton-Proton Collisions at RHIC