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:

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 \rho, \omega and \phi 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 J/\psi and \Lambda 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 J/\psi and \Lambda mesons, namely the appearance of kinematic correlations between the J/\psi meson and light hadrons in high multiplicity proton-Pb collisions, and the observation of elliptical flow of the \Upsilon(1S) 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.

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    Latest documents

    • Shreyasi Acharya, Dagmar Adamova, Apar Agarwal, Gianluca Aglieri Rinella, Luca Aglietta, et al.. Measurement of the production and elliptic flow of (anti)nuclei in Xe-Xe collisions at \sqrt{s_{\rm NN}} = 5.44 TeV. 2024. ⟨hal-04600664⟩
    • Shreyasi Acharya, Dagmar Adamova, Apar Agarwal, Gianluca Aglieri Rinella, Luca Aglietta, et al.. Measurement of the impact-parameter dependent azimuthal anisotropy in coherent \rho^0 photoproduction in Pb-Pb collisions at \sqrt{s_{\rm NN}} = 5.02 TeV. 2024. ⟨hal-04600283⟩
    • Shreyasi Acharya, Dagmar Adamova, Apar Agarwal, Gianluca Aglieri Rinella, Luca Aglietta, et al.. Charm fragmentation fractions and {\rm c\overline{c}} cross section in p-Pb collisions at \sqrt{s_{\rm NN}}=5.02 TeV. 2024. ⟨hal-04600284⟩
    • Shreyasi Acharya, Dagmar Adamova, Apar Agarwal, Gianluca Aglieri Rinella, Luca Aglietta, et al.. Probing strangeness hadronization with event-by-event production of multistrange hadrons. 2024. ⟨hal-04600667⟩
    • Shreyasi Acharya, Dagmar Adamova, Apar Agarwal, Gianluca Aglieri Rinella, Luca Aglietta, et al.. Measurement of {}_{\Lambda}^{3}\mathrm{H} production in Pb-Pb collisions at \sqrt{s_{\mathrm{NN}}} = 5.02 TeV. 2024. ⟨hal-04600663⟩
    • Shreyasi Acharya, Dagmar Adamova, Apar Agarwal, Gianluca Aglieri Rinella, Luca Aglietta, et al.. Investigating strangeness enhancement with multiplicity in pp collisions using angular correlations. 2024. ⟨hal-04600286⟩
    • Shreyasi Acharya, Dagmar Adamova, Apar Agarwal, Gianluca Aglieri Rinella, Luca Aglietta, et al.. Measurement of the production cross section of prompt \Xi^0_{\rm c} baryons in p-Pb collisions at \sqrt{s_{\mathrm{NN}}}~=~5.02 TeV. 2024. ⟨hal-04600285⟩
    • Shreyasi Acharya, Dagmar Adamova, Apar Agarwal, Gianluca Aglieri Rinella, Luca Aglietta, et al.. Investigating \Lambda baryon production in p-Pb collisions in jets and underlying event using angular correlations. 2024. ⟨hal-04600668⟩
    • Shreyasi Acharya, Dagmar Adamova, Apar Agarwal, Gianluca Aglieri Rinella, Luca Aglietta, et al.. Investigating strangeness enhancement in jet and medium via \phi(1020) production in p-Pb collisions at \sqrt{s_{\rm NN}} = 5.02 TeV. 2024. ⟨hal-04600287⟩
    • Shreyasi Acharya, Dagmar Adamova, Apar Agarwal, Gianluca Aglieri Rinella, Luca Aglietta, et al.. Measurement of \Omega^0_{\rm c} baryon production and branching-fraction ratio {\rm BR(\Omega^0_c \rightarrow \Omega^- e^+\nu_e)} / {\rm BR(\Omega^0_c \rightarrow \Omega^- \pi^+)} in pp collisions at \sqrt{s} = 13 TeV. 2024. ⟨hal-04562289⟩
    • Shreyasi Acharya, Dagmar Adamova, Apar Agarwal, Gianluca Aglieri Rinella, Luca Aglietta, et al.. Exclusive four pion photoproduction in ultraperipheral Pb-Pb collisions at \sqrt{s_{\rm NN}} = 5.02 TeV. 2024. ⟨hal-04556361⟩
    • Shreyasi Acharya, Dagmar Adamova, Apar Agarwal, Gianluca Aglieri Rinella, Luca Aglietta, et al.. Measurement of beauty-quark production in pp collisions at \sqrt{s}=13 TeV via non-prompt D mesons. 2024. ⟨hal-04482538⟩
    • Shreyasi Acharya, Dagmar Adamova, Gianluca Aglieri Rinella, Luca Aglietta, Michelangelo Agnello, et al.. Studying the interaction between charm and light-flavor mesons. 2024. ⟨hal-04426812⟩
    • Shreyasi Acharya, Dagmar Adamova, Gianluca Aglieri Rinella, Luca Aglietta, Michelangelo Agnello, et al.. Investigating the nature of the K^*_0(700) state with \pi^\pmK^0_{\rm S} correlations at the LHC. 2024. ⟨hal-04372040⟩
    • Shreyasi Acharya, Dagmar Adamova, Gianluca Aglieri Rinella, Michelangelo Agnello, Neelima Agrawal, et al.. Emergence of long-range angular correlations in low-multiplicity proton-proton collisions. Phys.Rev.Lett., 2024, 132 (17), pp.172302. ⟨10.1103/PhysRevLett.132.172302⟩. ⟨hal-04323191⟩
    • Shreyasi Acharya, Dagmar Adamova, Gianluca Aglieri Rinella, Michelangelo Agnello, Neelima Agrawal, et al.. Charged-particle production as a function of the relative transverse activity classifier in pp, p-Pb, and Pb-Pb collisions at the LHC. JHEP, 2024, 01, pp.056. ⟨10.1007/JHEP01(2024)056⟩. ⟨hal-04256689⟩
    • S Acharya, D Adamová, A Adler, G Aglieri Rinella, M Agnello, et al.. Measurement of the fraction of jet longitudinal momentum carried by Λc+ baryons in pp collisions. Phys.Rev.D, 2024, 109 (7), pp.072005. ⟨10.1103/PhysRevD.109.072005⟩. ⟨hal-04536153⟩
    • S Acharya, D Adamová, G Aglieri Rinella, M Agnello, N Agrawal, et al.. System-size dependence of the hadronic rescattering effect at energies available at the CERN Large Hadron Collider. Phys.Rev.C, 2024, 109 (1), pp.014911. ⟨10.1103/PhysRevC.109.014911⟩. ⟨hal-04427012⟩
    • Shreyasi Acharya, Dagmar Adamova, Gianluca Aglieri Rinella, Michelangelo Agnello, Neelima Agrawal, et al.. Photoproduction of K^{+}K^{-} pairs in ultra-peripheral collisions. Phys.Rev.Lett., 2024, 132 (22), pp.222303. ⟨10.1103/PhysRevLett.132.222303⟩. ⟨hal-04297443⟩
    • Shreyasi Acharya, Dagmar Adamova, Alexander Adler, Gianluca Aglieri Rinella, Michelangelo Agnello, et al.. Measurement of inclusive charged-particle jet production in pp and p-Pb collisions at \sqrt{s_{\rm NN}}=5.02 TeV. JHEP, 2024, 05, pp.041. ⟨10.1007/JHEP05(2024)041⟩. ⟨hal-04170225⟩
    • Shreyasi Acharya, Dagmar Adamova, Gianluca Aglieri Rinella, Michelangelo Agnello, Neelima Agrawal, et al.. K^{*}(892)^{\pm} resonance production in Pb-Pb collisions at \sqrt{s_{\rm NN}} = 5.02 TeV. Phys.Rev.C, 2024, 109 (4), pp.044902. ⟨10.1103/PhysRevC.109.044902⟩. ⟨hal-04199226⟩
    • U.A. Acharya, A. Adare, C. Aidala, N.N. Ajitanand, Y. Akiba, et al.. Charm- and Bottom-Quark Production in Au+Au Collisions at \sqrt{s_{_{NN}}} = 200 GeV. Phys.Rev.C, 2024, 109 (4), pp.044907. ⟨10.1103/PhysRevC.109.044907⟩. ⟨hal-03634241⟩
    • Shreyasi Acharya, Dagmar Adamova, Alexander Adler, Gianluca Aglieri Rinella, Michelangelo Agnello, et al.. Pseudorapidity dependence of anisotropic flow and its decorrelations using long-range multiparticle correlations in Pb-Pb and Xe-Xe collisions. Phys.Lett.B, 2024, 850, pp.138477. ⟨10.1016/j.physletb.2024.138477⟩. ⟨hal-04170227⟩
    • Shreyasi Acharya, Dagmar Adamova, Gianluca Aglieri Rinella, Michelangelo Agnello, Neelima Agrawal, et al.. Observation of abnormal suppression of \mathrm{f}_{0}(980) production in p-Pb collisions at \sqrt{s_{\rm NN}} = 5.02 TeV. Phys.Lett.B, 2024, 853, pp.138665. ⟨10.1016/j.physletb.2024.138665⟩. ⟨hal-04297440⟩