Measurement of inclusive J/ψ polarization in p+p collisions at sqrt{s} = 200 
GeV by the STAR experiment

STAR Collaboration,; Adam, J.; Schmitz, N.; Seyboth, P.; et al.,

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Measurement of inclusive J/ψ polarization in p+p collisions at sqrt{s} = 200 GeV by the STAR experiment

MPS-Authors

STAR Collaboration,
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Adam, J.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Schmitz, N.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Seyboth, P.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

et al.,
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

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Citation

STAR Collaboration, Adam, J., Schmitz, N., Seyboth, P., & et al. (2020). Measurement of inclusive J/ψ polarization in p+p collisions at sqrt{s} = 200 GeV by the STAR experiment. Physical Review D, 102, 092009. Retrieved from https://publications.mppmu.mpg.de/?action=search&mpi=MPP-2020-282.

Cite as: https://hdl.handle.net/21.11116/0000-0008-1B13-5

Abstract

We report on new measurements of inclusive J/\psi polarization at mid-rapidity in p+p collisions at sqrt{s} = 200 GeV by the STAR experiment at RHIC. The polarization parameters, \lambda_\theta, \lambda_\phi, and \lambda_{\theta\phi}, are measured as a function of transverse momentum (p_T) in both the Helicity and Collins-Soper (CS) reference frames within p_T< 10 GeV/C. Except for \lambda_\theta in the CS frame at the highest measured p_T, all three polarization parameters are consistent with 0 in both reference frames without any strong p_T dependence. Several model calculations are compared with data, and the one using the Color Glass Condensate effective field theory coupled with non-relativistic QCD gives the best overall description of the experimental results, even though other models cannot be ruled out due to experimental uncertainties.