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

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

2012-02-04

arxiv.org/abs/1202.0897v1

Physics

Nuclear Physics

Nuclear Experiment

6 pages, 4 figure, Proceedings of the International Conference on Strangeness in Quark Matter 2011 (SQM2011), Krakow, Poland,

Scientific paper

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 $NLO^+$ Color Singlet Model ($NLO^+$ CSM), Color Octet Model (COM) predictions and with no polarization within current uncertainties.

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