J/$\psi$ polarization in p+p collisions at $\sqrt{s}$ = 200 GeV in STAR

Abstract

In this paper, J/$\psi$ polarization at mid-rapidity in $p+p$ collisions at $\sqrt{s}$ = 200 GeV measured in the STAR experiment at RHIC is reported. J/$\psi$ production is analyzed via the dielectron decay channel. J/$\psi$ polarization is extracted from the decay angular distribution in the helicity frame. The J/$\psi$ polarization is measured at transverse momentum range (2 - 6) GeV/c and is found to be consistent with $NL{O}^{+}$ Color Singlet Model ($NL{O}^{+}$ CSM), Color Octet Model (COM) predictions and with no polarization within current uncertainties.

arXiv comment6 pages, 4 figure, Proceedings of the International Conference on Strangeness in Quark Matter 2011 (SQM2011), Krakow, Poland, September 18-24, 2011

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