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

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Théâtre National (Centre Bonlieu)

Théâtre National

Centre Bonlieu

Board: 59
Poster Heavy flavor and quarkonia production


Barbara Trzeciak (Warsaw University of Technology)


Barbara Trzeciak for the STAR Collaboration Currently there are many models with different assumptions regarding J/$\psi$ production mechanism that seem to describe the production cross section from experimental data reasonably well. Information on J/$\psi$ spin alignment, commonly named as J/$\psi$ polarization, may allow to discriminate J/$\psi$ production models. Moreover the prediction that J/$\psi$ polarization is transverse momentum dependent needs to be tested. Analysis of J/$\psi$ polarization at mid-rapidity in p+p collisions at $\sqrt{s}$ = 200 GeV registered in the STAR experiment will be presented. Data were triggered by the STAR Electromagnetic Calorimeter. J/$\psi$ is analyzed through its dielectron decay channel. The J/$\psi$ polarization is extracted from the decay angular distribution measured in the helicity frame.

Primary author

Barbara Trzeciak (Warsaw University of Technology)

Presentation materials