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:
- S. Curtoni, G. Bosson, J. Bouvier, J. Collot, D. Dauvergne, et al.. Towards a beam-tagging diamond hodoscope for online ion range monitoring. ENLIGHT 2019 : annual meeting of the European Network for Light Ion Hadron Therapy, Jul 2019, Caen, France. ⟨hal-02351809⟩
- Anne-Sophie Wozny, Guillaume VarĂšs, Gersende Alphonse, Caterina Monini, Philippe Lalle, et al.. A PARADIGM TO EXPLAIN THE DIFFERENTIAL EFFECTS OF CARBON ION AND X-RAY IRRADIATION ON TUMOR CELLS. European Network for Light Ion Hadron Therapy (ENLIGHT) annual meeting, Jul 2019, Caen, France. ⟨hal-02355841⟩
- S. Curtoni, G. Bosson, J. Bouvier, J. Collot, D. Dauvergne, et al.. Hodoscope diamant pour lâhadronthĂ©rapie - CLaRyS Ultra-Fast Timing. JournĂ©es du rĂ©seau semi-conducteurs, Jun 2019, Marseille, France. ⟨hal-02352012⟩
- A. Etxebeste, M. Fontana, Jean Michel LĂ©tang, G. LlosĂĄ, E. Munoz, et al.. A versatile GATE actor to perform simulations of Compton Camera systems. ANIMMA International conference on Advancements in Nuclear Instrumentation Measurement Methods and their Applications, Jun 2019, Portoroz, Slovenia. ⟨hal-03129802⟩
- Feriel Khellaf, Nils Krah, Jean Michel LĂ©tang, Simon Rit. A comparison of direct reconstruction algorithms in proton CT. 2nd Ion Imaging Workshop 2019, Jun 2019, Manchester, United Kingdom. ⟨hal-03128314⟩
- Brent Huisman, Etienne Testa, David Sarrut. Analytical and Monte-Carlo modeling of Multi-Parallel Slit and Knife-Edge Slit Prompt Gamma Cameras. PTCOG 58, Jun 2019, Manchester, United Kingdom. ⟨hal-03128213⟩
- Jessica Garcia, Anneâsophie Wozny, Florence Geiguer, AurĂ©lia Delherme, David Barthelemy, et al.. Profiling of circulating tumor DNA in plasma of nonâsmall cell lung cancer patients, monitoring of epidermal growth factor receptor p.T790M mutated allelic fraction using beads, emulsion, amplification, and magnetics companion assay and evaluation in future application in mimicking circulating tumor cells. Cancer Medicine, 2019, 8 (8), pp.3685-3697. ⟨10.1002/cam4.2244⟩. ⟨hal-02311075⟩
- Rainer Stiele, Wanda Maria Alberico, Andrea Beraudo, Renan CĂąmara Pereira, Pedro Costa, et al.. Aspects of isentropic trajectories in chiral effective models. 6th FAIR next generation scientists workshop 2019, May 2019, Genova, Italy. pp.012043, ⟨10.1088/1742-6596/1667/1/012043⟩. ⟨hal-02317310⟩
- M.L. Gallin-Martel, L. Abbassi, J.F. Adam, A. Bes, G. Bosson, et al.. Diamond-based detector development for beam monitoring. Hasselt Diamond Workshop 2019 SBDD XXIV, Mar 2019, Hasselt, Belgium. ⟨hal-02351059⟩
- Nils Krah, Vincenzo Patera, Simon Rit, Angelo Schiavi, Ilaria Rinaldi. Regularised patient-specific stopping power calibration for proton therapy planning based on proton radiographic images. Physics in Medicine and Biology, 2019, 64, pp.065008. ⟨10.1088/1361-6560/ab03db⟩. ⟨hal-02023861⟩
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