Speaker
Description
Polarization is a key observable to determine the quarkonium production mechanism in hadronic elementary collisions. Its very small value measured at the LHC has been challenging the commonly-used theoretical models and it still represents a major standing issue in the field.
On the other hand, phenomenological studies have shown that primordial quarkonium in heavy-ion collisions can be polarized by the strong magnetic field generated by the two colliding nuclei, while re-combined quarkonium is expected to be completely unpolarized.
We present the preliminary $p_{\mathrm{T}}$-differential measurement of $\mathrm{J}/\psi$ polarization in $\sqrt{s_{\mathrm{NN}}}
= $ 5.02 TeV Pb-Pb collisions at the LHC, discussing the analysis strategy and technique. The status of polarization measurements as a function of centrality as well as relative to the event plane will also be presented.
