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Transverse momentum dependence of J/ψ polarization at midrapidity in p+p collisions at √s=200 GeV

Abstract : We report the measurement of the transverse momentum dependence of inclusive J/ψ polarization in p+p collisions at √s=200 GeV performed by the PHENIX Experiment at the Relativistic Heavy Ion Collider. The J/ψ polarization is studied in the helicity, Gottfried-Jackson, and Collins-Soper frames for pT<5 GeV/c and |y|<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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http://hal.in2p3.fr/in2p3-00760878
Contributor : Sophie Heurteau <>
Submitted on : Tuesday, December 4, 2012 - 2:53:17 PM
Last modification on : Friday, November 13, 2020 - 9:12:25 AM

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  • HAL Id : in2p3-00760878, version 1

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A. Adare, M. P. Comets, D. Jouan, C. Suire, G. Roche, et al.. Transverse momentum dependence of J/ψ polarization at midrapidity in p+p collisions at √s=200 GeV. Physical Review D, American Physical Society, 2010, 10.1103/PhysRevD.82.012001, pp.012001. ⟨in2p3-00760878⟩

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