The international collaboration ALICE (“A Large Ion Collider Experiment”), of which the eponymous research group of the IP2I in Lyon is a member, aims to study nuclear matter in a state of extremely high temperature, where the deconfinement of hadrons (including protons and neutrons) into plasma of quarks and gluons takes place.
Matter is made up of atoms, themselves made up of electrons surrounding a nucleus of protons and neutrons, the latter being formed of quarks, linked by gluons. No quark or gluon has ever been observed in isolation: they appear to be permanently bonded together and confined in composite particles. At temperatures 100,000 times higher than those at the centre of the Sun, they deconform to form a plasma, which would have existed a few microseconds after the Big Bang. This plasma is predicted by the fundamental theory of strong interaction, Quantum Chromodynamics (QCD), and its study allows us to understand the ultimate organization of matter subject to strong interaction and the very first moments of the universe.
The LHC collides lead ions to recreate conditions similar to those immediately after the Big Bang and form this quark and gluon plasma. For this infinitely small study, a huge detector has been built at the LHC. It is capable of measuring the particles emitted by the plasma as it expands and cools.
Our group has been involved in this construction and in obtaining major results in this field of physics.
The activities of the ALICE group of the IP2I of Lyon are twofold:
- the analysis of data collected in proton-proton, proton-nucleus and nucleus-nucleus collisions at the CERN LHC
- participation in the construction and operation of the forward vertex trajectograph, the Muon Forward Tracker
Analysis of data collected in proton-proton, proton-nucleus and nucleus-nucleus collisions at the CERN LHC
The physics analyses of the ALICE experiment carried out in the Lyon groups cover a wide range of subjects, from the light quark sector u, d, s with the study of the forward production of low mass vector mesons 
and 
in the dimuonic decay channel, to the heavy quarks sector c and b, with the study of the production of the quarkonium states of the 
and 
families. This analytical work has already led to a number of remarkable results, notably through the study of collective phenomena characterizing the evolution of the and mesons, namely the appearance of kinematic correlations between the meson and light hadrons in high multiplicity proton-Pb collisions, and the observation of elliptical flow of the 
meson compatible with zero in Pb-Pb collisions (behavior different from all the other particles studied).
Participation in the construction and operation of the forward vertex trajectograph, the Muon Forward Tracker
The group is also responsible for the construction and operation of the vertex forward trajectograph, the Muon Forward Tracker (MFT), one of the first applications in high energy physics of CMOS silicon pixel sensor technology. The MFT, which will be integrated into the ALICE detector starting with Run3 of the LHC (2021), is designed to enable precise measurement of the details of the vertex region for forward-produced particles, especially muons, whose different topologies and production processes can be studied.
NON-PERMANENTS:
- DOCTORANTS / DOCTORAL STUDENTS:
- O. StĂ©zowski. AGATA-GRETINA Processing and Neural Networks. Second AGATA-GRETINA tracking arrays collaboration meeting, Apr 2018, Orsay, France. ⟨in2p3-02101706⟩
- M. Gouzevitch. HH->bbbb boosted. 3rd CMS HH Workshop, Apr 2018, Paris, France. ⟨hal-02076991⟩
- Anne-Sophie Wozny, Gersende Alphonse, Guillaume Vares, Caterina Monini, Jean-Baptiste Guy, et al.. La distribution spatiale des radicaux libres oxygĂ©nĂ©s permet d’expliquer la diffĂ©rence d’activation des processus d’invasion/migration des cellules souches cancĂ©reuses en rĂ©ponse aux photons et aux ions carbone. Forum de la recherche en CancĂ©rologie 2018, Apr 2018, Villeurbanne, France. ⟨hal-01990890⟩
- Alexandra Lauret, Pierre Philouze, CĂ©line MalĂ©sys, Philippe CĂ©ruse, Jonathan Lopez, et al.. Comparaison du profil d’expression gĂ©nique de biopsies et de cellules tumorales circulantes dans le suivi thĂ©rapeutique des cancers des VADS. Forum de la recherche en CancĂ©rologie 2018, Apr 2018, Villeurbanne, France. ⟨hal-01990828⟩
- Floriane Poignant, BenoĂ®t Gervais, Andrei Ipatov, Hela Charfi, Etienne Testa, et al.. ModĂ©lisation physique, chimique et biologique pour la radiothĂ©rapie amĂ©liorĂ©e par les nanoparticules Ă fort-Z : vers une meilleure comprĂ©hension de l’effet radiosensibilisant. Forum de la recherche en CancĂ©rologie 2018, Apr 2018, Villeurbanne, France. ⟨hal-01989615⟩
- Caterina Monini, Etienne Testa, Michael Beuve. NanOx, a New Multiscale Model to Predict Ion RBE in Hadrontherapy. Forum de la recherche en CancĂ©rologie 2018, Apr 2018, Villeurbanne, France. ⟨hal-01989470⟩
- Giovanna Muggiolu, Sarah Libert, Alexandra Lauret, Philippe CĂ©ruse, Christian Adrien Righini, et al.. Stratification of Head and Neck Cancers: DNA Repair Enzyme Signature to Identify Resistance and Toxicity Biomarkers. Forum de la recherche en CancĂ©rologie 2018, Apr 2018, Villeurbanne, France. ⟨hal-01990547⟩
- Gersende Alphonse, Marie-Anne Chanrion, Micaela Cunha, Caterina Monini, Floriane Poignant, et al.. Interaction des radiations ionisantes avec les systèmes biologiques : modĂ©lisation multi-Ă©chelle pour comprendre et optimiser les radiothĂ©rapies innovantes. Forum de la recherche en CancĂ©rologie 2018, Apr 2018, Villeurbanne, France. ⟨hal-01989434⟩
- D. Tsimpis. Quartic fermions in IIA superspace. Recent developments in high energy theory and cosmology, Mar 2018, Athènes, Greece. ⟨hal-02063767⟩
- Hugues Lattaud. Jet Energy calibration and resolution at the CMS experiment with 13 TeV collisions. Poster @LHCC, Feb 2018, CERN, Switzerland. ⟨hal-02023525⟩
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