Orateur
Description
The quark-gluon plasma (QGP) is a state of matter at high temperatures and/or high baryon density where quarks and gluons are asymptotically free and not confined in hadrons anymore. Experimentally, it can be produced
during heavy ion collisions using large accelerator facilities such as the LHC. The ALICE experiment focuses on characterizing the QGP properties using
the aforementioned collisions and produced probes such as hadrons, leptons or photons. One privileged hard probe are the Quarkonia, bound states of a heavy quark (charm or beauty) and its anti-quark, because they are experiencing the full history of the collision.
ALICE underwent an upgrade in LS2 and is now in continuous readout configuration. This came with important changes within the Muon Spectrometer electronics which imply, for example, proper tuning of the tracking chamber response. Those tunings are important for the clustering algorithm and Monte-Carlo productions as it can improve the resolution of the signal and the detector efficiency. A method to retrieve the intrinsic noise of the pads from the Cathode Pads Chamber is proposed and compared with the current tuning used for data-taking.
The observation of the bound states J/ψ and Υ(nS) via their muonic decay channel will be conducted using the ALICE Muon Spectrometer. The J/ψ production in pp collision comes from two main sources. The first one is the prompt composed of J/ψ created directly at the collision or J/ψ from decay of heavier charmonium states such as χc or ψ(2s) (feed-down process). The second one is the non-prompt containing J/ψ resulting from the decay of b hadrons.
Thanks to the addition of the Muon Forward Tracker (MFT) in ALICE Run 3,
it is now possible to separate the aforementioned sources in the J/ψ production.
As for the inclusive Υ(nS) states, they are measured in the same forward pseudo-
rapidity as the prompt/non-prompt J/ψ ( −3.6 < |η| < −2.5) using 2024 data
collected by ALICE in proton-proton collisions at √s = 13.6 TeV.
Measuring at the same time non-prompt J/ψ and Υ will allow to constraint the open charm over open beauty production. This analysis will pave the way for similar studies in heavy-ions collisions.
