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  • Adare, A., et al. (author)
  • Transverse momentum dependence of J/psi polarization at midrapidity in p plus p collisions at root s=200 GeV
  • 2010
  • In: Physical Review D (Particles, Fields, Gravitation and Cosmology). - 1550-2368. ; 82:1
  • Journal article (peer-reviewed)abstract
    • We report the measurement of the transverse momentum dependence of inclusive J/psi polarization in p + p collisions at root s = 200 GeV performed by the PHENIX Experiment at the Relativistic Heavy Ion Collider. The J/psi polarization is studied in the helicity, Gottfried-Jackson, and Collins-Soper frames for p(T) < 5 GeV/c and vertical bar y vertical bar < 0.35. The polarization in the helicity and Gottfried-Jackson frames is consistent with zero for all transverse momenta, with a slight (1.8 sigma) trend towards longitudinal polarization for transverse momenta above 2 GeV/c. No conclusion is allowed due to the limited acceptance in the Collins-Soper frame and the uncertainties of the current data. The results are compared to observations for other collision systems and center of mass energies and to different quarkonia production models.
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