13-19 May 2018
Venice, Italy
Europe/Zurich timezone
The organisers warmly thank all participants for such a lively QM2018! See you in China in 2019!

Quarkonium measurements in nucleus-nucleus collisions with ALICE

14 May 2018, 16:30
Sala Mosaici-2, 3rd Floor (Palazzo del Casinò)

Sala Mosaici-2, 3rd Floor

Palazzo del Casinò

Parallel Talk Quarkonia Quarkonia


Pascal Dillenseger (Johann-Wolfgang-Goethe Univ. (DE))


Quarkonia, i.e. bound states of $b\bar{b}$ and $c\bar{c}$ quarks, are powerful observables to study the properties of nuclear matter under extreme conditions. The formation of a Quark-Gluon Plasma (QGP), which is predicted by lattice calculations at high temperatures as reached at LHC energies, has a strong influence on the production and behavior of quarkonia. A suppression, due to the color screening effect, with respect to the proton-proton results scaled by the number of binary collisions is expected. However, charmonium measurements from Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 and 5.02 TeV revealed a smaller suppression than what was observed at lower energies at the SPS and RHIC. Concurrently, the produced J/$\psi$ present a significant elliptic flow ($v_{2}$) in semi-central collisions. These measurements point to a competition between charmonium suppression and (re)generation at LHC energies, with a participation of the charm quarks to the collectivity of the medium. Thus quarkonium measurements offer great possibilities to gain further knowledge about the QGP.

In this presentation, latest ALICE results on the bottomonium and charmonium production in nucleus-nucleus collisions will be presented. This includes measurements of $\Upsilon$(1S) and $\Upsilon$(2S) nuclear modification factors ($R_{\rm AA}$) at forward rapidity and the charmonium $R_{\rm AA}$ and $v_{2}$ as a function of centrality, $p_{\rm T}$ and rapidity in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV. Also, first results from $J/\psi$ measurements in Xe-Xe collisions at $\sqrt{s_{\rm NN}}$ = 5.44 TeV will be presented. Further on, the experimental results will be compared to various calculations from theoretical models.

Content type Experiment
Collaboration ALICE
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