J/ψ polarization in p+p collisions at $\sqrt{s}$ = 200 GeV in STAR
Phys.Lett.B 739 (2014) 180-188, 2014.
The collaboration

Abstract (data abstract)
$J/\psi$ polarization in $p+p$ collisions at SQRT(s)= 200 GeV in STAR. Results from the STAR experiment at Relativistic Heavy Ion Collider.