Speaker
Barbara Trzeciak
(Czech Technical University in Prague)
Description
Barbara Trzeciak for the STAR Collaboration
The $J/\psi$ production mechanism in elementary particle collisions is not yet exactly known.
For many years measurements of the J/$\psi$ cross-section have been used to test different J/$\psi$ production models. While many models can describe relatively well the experimental data on the J/$\psi$ cross-section in $p+p$ collisions, they have different predictions for the J/$\psi$ polarization. Therefore, measurements of the J/$\psi$ polarization may allow to discriminate among different models and provide new insight into the J/$\psi$ production mechanism.
In this talk, results on the J/$\psi$ cross-section at $\sqrt{s}$ = 200 and 500 GeV and the J/$\psi$ polarization at $\sqrt{s}$ = 200 measured via the dielectron decay channel at mid-rapidity in $p+p$ collisions in the STAR experiment will be discussed. We will also report a status of the J/$\psi$ polarization analysis and the first $\psi(2S)$ measurement at $\sqrt{s}$ = 500 GeV. Moreover, prospects of charmonia measurements with the newly upgraded STAR detector will be reported.
Author
Barbara Trzeciak
(Czech Technical University in Prague)
