Transverse momentum dependence of J/psi polarization at midrapidity in p+p collisions at s**(1/2) = 200-GeV
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Abstract: (arXiv)
We report the measurement of the transverse momentum dependence of inclusive J/psi polarization in p+p collisions at sqrt(s)=200 GeV performed by the PHENIX Experiment at RHIC. The polarization is studied in the helicity, Gottfried-Jackson, and Collins-Soper frames for p_T < 5 GeV/c and |y| < 0.35. The J/psi 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.Note:
- 384 authors from 62 institutions, 11 pages, 9 figures, 2 tables. v2 is expanded version submitted to Physical Review D. Plain text data tables for the points plotted in figures are available at http://www.phenix.bnl.gov/papers.html
- 25.75.Dw
- p p: inclusive reaction
- J/psi(3100): hadroproduction
- J/psi(3100): polarization
- polarization: longitudinal
- quarkonium: production
- transverse momentum dependence
- helicity
- PHENIX
- Brookhaven RHIC Coll
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