Speaker
Marco Leoncino
(University of Turin and INFN (IT))
Description
Quarkonium states are important probes to investigate the properties of strongly interacting matter created in ultrarelativistic heavy-ion collisions and to confirm the presence of Quark-Gluon Plasma (QGP). A significant contribution to the observed suppression can also come from cold nuclear matter effects, which can be studied in proton-nucleus collisions. The $\psi(2{\rm S})$ production is studied in pp, p-Pb and Pb-Pb collisions at LHC energies using the ALICE detector, down to zero transverse momentum, in the dimuon decay channel and in the laboratory rapidity range $2.5 < y < 4$. The statistics is limited, with S/B ratios $\leq$ 0.2 (in pp collisions). In this situation, the extraction of the signal from the dimuon invariant mass distribution becomes very delicate, especially when performing differential analyses (e.g., vs. transverse momentum or rapidity). Therefore, the robustness of the $\psi(2{\rm S})$ signal extraction procedure is crucial to extract final physics results. Several approaches have been investigated, and details on the techniques adopted in the different collision systems will be presented.
| On behalf of collaboration: | ALICE |
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Primary author
Marco Leoncino
(University of Turin and INFN (IT))
