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

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

2009-11-11

arxiv.org/abs/0911.2113v2

Phys.Rev.D81:014020,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

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

Scientific paper

10.1103/PhysRevD.81.014020

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.

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