Polarization of prompt J/ψ in ppJ/ψ+X at s=200GeV

Hee Sok Chung, Seyong Kim, Jungil Lee, and Chaehyun Yu
Phys. Rev. D 83, 037501 – Published 11 February 2011

Abstract

Within the framework of the nonrelativistic QCD factorization approach, we compute the cross section and polarization of prompt J/ψ produced from proton-proton collisions at the center-of-momentum energy s=200GeV. 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 2GeV<pT<20GeV. The perturbative contributions are computed at leading order in the strong coupling constant. We predict slight transverse polarization of J/ψ in the forward-rapidity region, while that for the midrapidity 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 αs, but disagrees with the result from the leading-order color-singlet model or the s-channel-cut method.

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  • Received 9 December 2010

DOI:https://doi.org/10.1103/PhysRevD.83.037501

© 2011 American Physical Society

Authors & Affiliations

Hee Sok Chung1, Seyong Kim2,3, Jungil Lee1, and Chaehyun Yu3

  • 1Department of Physics, Korea University, Seoul 136-701, Korea
  • 2Department of Physics, Sejong University, Seoul 143-747, Korea
  • 3School of Physics, Korea Institute for Advanced Study, Seoul 130-722, Korea

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Issue

Vol. 83, Iss. 3 — 1 February 2011

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