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.

PERMANENTS:
NON-PERMANENTS:

- DOCTORANTS / DOCTORAL STUDENTS:
- CHERCHEURS NON-PERMANENTS / NON-PERMANENT RESEARCHERS:
Publications HAL


2022

Journal articles

Shreyasi Acharya, Dagmar Adamova, Alexander Adler, Jonatan Adolfsson, Gianluca Aglieri Rinella, et al.. Production of light (anti)nuclei in pp collisions at \sqrt{s} = 13 TeV. JHEP, 2022, 01, pp.106. ⟨10.1007/JHEP01(2022)106⟩. ⟨hal-03372880⟩ https://arxiv.org/pdf/2109.13026

Shreyasi Acharya, Dagmar Adamova, Alexander Adler, Jonatan Adolfsson, Gianluca Aglieri Rinella, et al.. Charm-quark fragmentation fractions and production cross section at midrapidity in pp collisions at the LHC. Physical Review D, 2022, 105 (1), pp.L011103. ⟨10.1103/PhysRevD.105.L011103⟩. ⟨hal-03235647⟩ https://arxiv.org/pdf/2105.06335

Shreyasi Acharya, Dagmar Adamova, Alexander Adler, Jonatan Adolfsson, Gianluca Aglieri Rinella, et al.. Inclusive, prompt and non-prompt J/ψ production at midrapidity in p-Pb collisions at \sqrt{s_{\mathrm{NN}}} = 5.02 TeV. JHEP, 2022, 06, pp.011. ⟨10.1007/JHEP06(2022)011⟩. ⟨hal-03235649⟩ https://arxiv.org/pdf/2105.04957

Shreyasi Acharya, Dagmar Adamova, Alexander Adler, Jonatan Adolfsson, Gianluca Aglieri Rinella, et al.. Direct observation of the dead-cone effect in quantum chromodynamics. Nature, 2022, 605 (7910), pp.440-446. ⟨10.1038/s41586-022-04572-w⟩. ⟨hal-03268792⟩ https://arxiv.org/pdf/2106.05713

Shreyasi Acharya, Dagmar Adamova, Alexander Adler, Jonatan Adolfsson, Gianluca Aglieri Rinella, et al.. Exploring the NΛ–NΣ coupled system with high precision correlation techniques at the LHC. Phys.Lett.B, 2022, 833, pp.137272. ⟨10.1016/j.physletb.2022.137272⟩. ⟨hal-03210345⟩ https://arxiv.org/pdf/2104.04427

Shreyasi Acharya, Dagmar Adamova, Alexander Adler, Jonatan Adolfsson, Gianluca Aglieri Rinella, et al.. Measurement of K^{*}(892)^{\mathrm{\pm}} production in inelastic pp collisions at the LHC. Phys.Lett.B, 2022, 828, pp.137013. ⟨10.1016/j.physletb.2022.137013⟩. ⟨hal-03235652⟩ https://arxiv.org/pdf/2105.05760

U.A. Acharya, C. Aidala, Y. Akiba, M. Alfred, V. Andrieux, et al.. Transverse-single-spin asymmetries of charged pions at midrapidity in transversely polarized p{+}p collisions at \sqrt{s}=200  GeV. Physical Review D, 2022, 105 (3), pp.032003. ⟨10.1103/PhysRevD.105.032003⟩. ⟨hal-03597817⟩ https://arxiv.org/pdf/2112.05680

U.A. Acharya, A. Adare, C. Aidala, N.N. Ajitanand, Y. Akiba, et al.. Kinematic dependence of azimuthal anisotropies in p+Au, d+Au, and ^3He+Au at \sqrt{s}_{NN}=200 GeV. Physical Review C, 2022, 105 (2), pp.024901. ⟨10.1103/PhysRevC.105.024901⟩. ⟨hal-03557652⟩ https://arxiv.org/pdf/2107.06634

Shreyasi Acharya, Dagmar Adamova, Alexander Adler, Jonatan Adolfsson, Gianluca Aglieri Rinella, et al.. Nuclear modification factor of light neutral-meson spectra up to high transverse momentum in p–Pb collisions at sNN=8.16 TeV. Phys.Lett.B, 2022, 827, pp.136943. ⟨10.1016/j.physletb.2022.136943⟩. ⟨hal-03203640⟩ https://arxiv.org/pdf/2104.03116

Shreyasi Acharya, Dagmar Adamova, Alexander Adler, Jonatan Adolfsson, Gianluca Aglieri Rinella, et al.. Measurement of Prompt D^{0}, \Lambda_{c}^{+}, and \Sigma_{c}^{0,++}(2455) Production in Proton–Proton Collisions at \sqrt s = 13  TeV. Physical Review Letters, 2022, 128 (1), pp.012001. ⟨10.1103/PhysRevLett.128.012001⟩. ⟨hal-03269684⟩ https://arxiv.org/pdf/2106.08278

U.A. Acharya, C. Aidala, Y. Akiba, M. Alfred, V. Andrieux, et al.. Transverse single spin asymmetries of forward neutrons in p+p, p+Al and p+Au collisions at \sqrt{s_{_{NN}}}=200 GeV as a function of transverse and longitudinal momenta. Physical Review D, 2022, 105 (3), pp.032004. ⟨10.1103/PhysRevD.105.032004⟩. ⟨hal-03597820⟩ https://arxiv.org/pdf/2110.07504

Shreyasi Acharya, Dagmar Adamova, Alexander Adler, Jonatan Adolfsson, Gianluca Aglieri Rinella, et al.. Investigating the role of strangeness in baryon–antibaryon annihilation at the LHC. Phys.Lett.B, 2022, 829, pp.137060. ⟨10.1016/j.physletb.2022.137060⟩. ⟨hal-03235685⟩ https://arxiv.org/pdf/2105.05190

Emilien Chapon, David d'Enterria, Bertrand Ducloue, Miguel G. Echevarria, Pol-Bernard Gossiaux, et al.. Prospects for quarkonium studies at the high-luminosity LHC. Prog.Part.Nucl.Phys., 2022, 122, pp.103906. ⟨10.1016/j.ppnp.2021.103906⟩. ⟨hal-03129560⟩ https://arxiv.org/pdf/2012.14161

2021

Journal articles

Shreyasi Acharya, Dagmar Adamova, Alexander Adler, Jonatan Adolfsson, Gianluca Aglieri Rinella, et al.. Inclusive heavy-flavour production at central and forward rapidity in Xe-Xe collisions at \sqrt {s_{NN}}=5.44TeV. <i>Phys.Lett.B</i>, 2021, 819, pp.136437. <a target="_blank" href="https://dx.doi.org/10.1016/j.physletb.2021.136437">⟨10.1016/j.physletb.2021.136437⟩</a>. <a target="_blank" href="https://hal.archives-ouvertes.fr/hal-03034818">⟨hal-03034818⟩</a>   <a href="https://arxiv.org/pdf/2011.06970"  target="_blank"><img alt="https://arxiv.org/pdf/2011.06970" src="https://haltools.archives-ouvertes.fr/images/Haltools_pdf.png" border="0" title="PDF" width="16px" height="16px" /></a> <span class="LienBibtexACoteFulltext"><a href="https://hal.archives-ouvertes.fr/hal-03034818/bibtex" target="_self"> <img alt="" src="" border="0"  title="" /></a> </span>   Shreyasi Acharya, Dagmar Adamova, Alexander Adler, Jonatan Adolfsson, Madan Mohan Aggarwal, et al.. Pion-kaon femtoscopy and the lifetime of the hadronic phase in Pb-Pb collisions at\sqrt{s_{\rm{NN}}}= 2.76 TeV. <i>Phys.Lett.B</i>, 2021, 813, pp.136030. <a target="_blank" href="https://dx.doi.org/10.1016/j.physletb.2020.136030">⟨10.1016/j.physletb.2020.136030⟩</a>. <a target="_blank" href="https://hal.science/hal-02911938">⟨hal-02911938⟩</a>  <dd class="ValeurRes Fichier_joint"> <a href="https://hal.science/hal-02911938/file/hal-02911938.pdf"  target="_blank"> <img alt="https://hal.science/hal-02911938/file/hal-02911938.pdf" src="https://haltools.archives-ouvertes.fr/images/Haltools_pdf.png" border="0" title="https://hal.science/hal-02911938/file/hal-02911938.pdf" /></a> <span class="LienBibtexACoteFulltext"><a href="https://hal.science/hal-02911938/bibtex" target="_self"> <img alt="" src="" border="0"  title="" /></a> </span>   Shreyasi Acharya, Dagmar Adamova, Alexander Adler, Jonatan Adolfsson, Gianluca Aglieri Rinella, et al.. Charged-particle multiplicity fluctuations in Pb-Pb collisions at\sqrt{s_{\mathrm {NN}}} = 2.76 TeV. <i>Eur.Phys.J.C</i>, 2021, 81 (11), pp.1012. <a target="_blank" href="https://dx.doi.org/10.1140/epjc/s10052-021-09784-4">⟨10.1140/epjc/s10052-021-09784-4⟩</a>. <a target="_blank" href="https://hal.archives-ouvertes.fr/hal-03235686">⟨hal-03235686⟩</a>   <a href="https://arxiv.org/pdf/2105.05745"  target="_blank"><img alt="https://arxiv.org/pdf/2105.05745" src="https://haltools.archives-ouvertes.fr/images/Haltools_pdf.png" border="0" title="PDF" width="16px" height="16px" /></a> <span class="LienBibtexACoteFulltext"><a href="https://hal.archives-ouvertes.fr/hal-03235686/bibtex" target="_self"> <img alt="" src="" border="0"  title="" /></a> </span>   Shreyasi Acharya, Dagmar Adamova, Alexander Adler, Jonatan Adolfsson, Gianluca Aglieri Rinella, et al.. First measurement of coherent ρ0 photoproduction in ultra-peripheral Xe-Xe collisions at sNN=5.44 TeV. <i>Phys.Lett.B</i>, 2021, 820, pp.136481. <a target="_blank" href="https://dx.doi.org/10.1016/j.physletb.2021.136481">⟨10.1016/j.physletb.2021.136481⟩</a>. <a target="_blank" href="https://hal.archives-ouvertes.fr/hal-03122211">⟨hal-03122211⟩</a>   <a href="https://arxiv.org/pdf/2101.02581"  target="_blank"><img alt="https://arxiv.org/pdf/2101.02581" src="https://haltools.archives-ouvertes.fr/images/Haltools_pdf.png" border="0" title="PDF" width="16px" height="16px" /></a> <span class="LienBibtexACoteFulltext"><a href="https://hal.archives-ouvertes.fr/hal-03122211/bibtex" target="_self"> <img alt="" src="" border="0"  title="" /></a> </span>   Shreyasi Acharya, Dagmar Adamova, Alexander Adler, Jonatan Adolfsson, Gianluca Aglieri Rinella, et al.. Multiharmonic Correlations of Different Flow Amplitudes in Pb-Pb Collisions at\sqrt{s_{_{NN}}}=2.76  TeV. <i>Physical Review Letters</i>, 2021, 127 (9), pp.092302. <a target="_blank" href="https://dx.doi.org/10.1103/PhysRevLett.127.092302">⟨10.1103/PhysRevLett.127.092302⟩</a>. <a target="_blank" href="https://hal.archives-ouvertes.fr/hal-03122312">⟨hal-03122312⟩</a>   <a href="https://arxiv.org/pdf/2101.02579"  target="_blank"><img alt="https://arxiv.org/pdf/2101.02579" src="https://haltools.archives-ouvertes.fr/images/Haltools_pdf.png" border="0" title="PDF" width="16px" height="16px" /></a> <span class="LienBibtexACoteFulltext"><a href="https://hal.archives-ouvertes.fr/hal-03122312/bibtex" target="_self"> <img alt="" src="" border="0"  title="" /></a> </span>   Shreyasi Acharya, Dagmar Adamova, Alexander Adler, Jonatan Adolfsson, Gianluca Aglieri Rinella, et al.. Measurements of mixed harmonic cumulants in Pb-Pb collisions at\sqrt {s_{NN}}= 5.02 TeV. <i>Phys.Lett.B</i>, 2021, 818, pp.136354. <a target="_blank" href="https://dx.doi.org/10.1016/j.physletb.2021.136354">⟨10.1016/j.physletb.2021.136354⟩</a>. <a target="_blank" href="https://hal.science/hal-03171343">⟨hal-03171343⟩</a>   <a href="https://arxiv.org/pdf/2102.12180"  target="_blank"><img alt="https://arxiv.org/pdf/2102.12180" src="https://haltools.archives-ouvertes.fr/images/Haltools_pdf.png" border="0" title="PDF" width="16px" height="16px" /></a> <span class="LienBibtexACoteFulltext"><a href="https://hal.science/hal-03171343/bibtex" target="_self"> <img alt="" src="" border="0"  title="" /></a> </span>   Shreyasi Acharya, Dagmar Adamova, Alexander Adler, Jonatan Adolfsson, Madan Mohan Aggarwal, et al.. Transverse-momentum and event-shape dependence of D-meson flow harmonics in Pb-Pb collisions at\sqrt {s_{NN}}$ = 5.02 TeV. Phys.Lett.B, 2021, 813, pp.136054. ⟨10.1016/j.physletb.2020.136054⟩. ⟨hal-02863126⟩

https://hal.science/hal-02863126/file/hal-02863126.pdf