Speaker
Barbara Trzeciak
(Czech Technical University in Prague)
Description
Experimental data on the J/$\psi$ cross section in $p$+$p$ collisions can be described relatively well by many models that are currently available on the market. These models have different predictions regarding the J/$\psi$ polarization. Therefore measurements of the J/$\psi$ polarization may allow discriminating among the models and provide new insight into on the J/$\psi$ production mechanism.
The previous STAR J/$\psi$ polarization analysis was performed only for the polarization parameter $\lambda_{\theta}$ and in one reference frame due to limited statistics. Proton-proton data taken in year 2011 at $\sqrt{s}$ = 500 GeV with integrated luminosity of 22 $pb^{-1}$ will allow us to extract the full information about the dielectron decay angular distribution of the J/$\psi$ in different reference frames (helicity, Collins-Soper and Gottfried-Jackson frames). In this presentation, the status of the J/$\psi$ polarization measurement at mid-rapidity at $\sqrt{s}$ = 500 GeV in $p$+$p$ collisions in the STAR experiment will be shown.
| On behalf of collaboration: | STAR |
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Primary author
Barbara Trzeciak
(Czech Technical University in Prague)
