Journal
PHYSICAL REVIEW D
Volume 81, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.81.014020
Keywords
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Funding
- Korean Government (MOEHRD) [KRF-2006-311-C00020]
- National Research Foundation of Korea (NRF) [KRF-2008-313-C00163]
- Ministry of Education, Science and Technology [2009-0072689]
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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 root 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 vertical bar y vertical bar < 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 vertical bar y vertical bar < 0.35 (1.2 < vertical bar y vertical bar < 2.2) agree with the data within errors.
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