5-11 February 2017
Hyatt Regency Chicago
America/Chicago timezone

Bottomonium measurements at forward rapidity in Pb-Pb and p-Pb collisions with ALICE at LHC

7 Feb 2017, 16:30
Regency C

Regency C


Dr Antoine Lardeux (University of Oslo (NO)) Indranil Das (Saha Institute of Nuclear Physics (IN))


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

Primary authors

Dr Antoine Lardeux (University of Oslo (NO)) Indranil Das (Saha Institute of Nuclear Physics (IN))

Presentation materials