Speakers
Description
The production of heavy quarkonia is an important observable to study the
properties of the nuclear matter created in high-energy heavy-ion
collisions. Lattice QCD calculations predict a phase transition of the
hadronic matter to a deconfined medium of quarks and gluons, the Quark
Gluon Plasma (QGP), at extreme energy densities. The bottomonium bound
states while passing through the deconfined medium are dissociated
into quark-antiquark pair due to color screening. This is visible in data
as a suppression of $\Upsilon$ resonances with respect to the
proton-proton results scaled by the number of binary
collisions. However, the cold nuclear matter effects can also lead to the
suppression of $\Upsilon$ resonances in heavy-ion collisions. Cold
nuclear effects are studied in p-Pb collisions since the QGP is not
expected to be produced. ALICE measures the bottomonium down to zero
transverse momentum via the dimuon decay channel at forward rapidity
($2.5 \lt y \lt 4$).
In this presentation, the final results on the nuclear modification factor of $\Upsilon$
measured in Pb--Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
will be shown as a function of centrality, transverse momentum and
rapidity. The results will be compared with the existing
theoretical models. In this context, the $\Upsilon$ measurements in
p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV will be
discussed as well. Finally, the ALICE results will be compared to results from other experiments.
| Preferred Track | Quarkonia |
|---|---|
| Collaboration | ALICE |
