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High Energy Physics - Phenomenology

arXiv:1012.1954 (hep-ph)
[Submitted on 9 Dec 2010 (v1), last revised 12 Feb 2011 (this version, v2)]

Title:Polarization of prompt J/psi in pp -> J/psi+X at sqrt{s}=200 GeV

Authors:Hee Sok Chung (Korea U.), Seyong Kim (Sejong U.), Jungil Lee (Korea U.), Chaehyun Yu (KIAS)
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Abstract:Within the framework of the nonrelativistic QCD factorization approach, we compute the cross section and polarization of prompt J/psi produced from proton-proton collisions at the center-of-momentum energy sqrt{s}=200 GeV. We present the transverse-momentum distribution in the forward-rapidity region 1.2 < |y| < 2.2 and the rapidity distribution over the transverse-momentum range 2 GeV < p_T < 20 GeV. The perturbative contributions are computed at leading order in the strong coupling constant. We predict slight transverse polarization of J/psi in the forward-rapidity region, while that for the mid-rapidity region is slightly longitudinal. The transverse-momentum distribution agrees well with the PHENIX preliminary data and the color-singlet-model prediction at next-to-leading order in alpha_s, but disagrees with the result from the leading-order color-singlet model or the s-channel-cut method.
Comments: 4 pages, 4 figures, minor corrections, version published in Phys. Rev. D
Subjects: High Energy Physics - Phenomenology (hep-ph)
Cite as: arXiv:1012.1954 [hep-ph]
  (or arXiv:1012.1954v2 [hep-ph] for this version)
  https://doi.org/10.48550/arXiv.1012.1954
Journal reference: Phys.Rev.D83:037501,2011
Related DOI: https://doi.org/10.1103/PhysRevD.83.037501

Submission history

From: Hee Sok Chung [view email]
[v1] Thu, 9 Dec 2010 09:29:13 UTC (35 KB)
[v2] Sat, 12 Feb 2011 05:12:39 UTC (35 KB)
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