Transverse momentum dependence ofJ/ψpolarization at midrapidity inp+pcollisions ats=200 GeV
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Abstract
We report the measurement of the transverse momentum dependence of inclusive $J/\ensuremath{\psi}$ polarization in $p+p$ collisions at $\sqrt{s}=200\text{ }\text{ }\mathrm{GeV}$ performed by the PHENIX Experiment at the Relativistic Heavy Ion Collider. The $J/\ensuremath{\psi}$ polarization is studied in the helicity, Gottfried-Jackson, and Collins-Soper frames for ${p}_{T}<5\text{ }\text{ }\mathrm{GeV}/c$ 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 $2\text{ }\text{ }\mathrm{GeV}/c$. 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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