Publications

    • Inclusive polarised J/ψ production in high energy hadron collisions
      We study the inclusive polarised and unpolarised productions of J/ψ coming from χc radiative decays in high energy hadron-hadron collisions. It is carried out at leading order in the Non-Relativistic QCD approach combined with the k⊥-factorisation framework. The polarised and unpolarised observables are analysed in detail both qualitatively and quantitatively for various polarisation frames and energies.
      With R. Pasechnik – Master Thesis – THEP Lund (2012)
    • Semi-classical approach to J/ψ suppression in high energy heavy-ion collisions
      We study the heavy quark/antiquark pair dynamics in strongly-coupled quark gluon plasma. A semi-classical approach, based on the Wigner distribution and Langevin dynamics, is applied to a color screened c anti-c pair, in a hydrodynamically cooling fireball, to evaluate the total J/ψ suppression at both RHIC and LHC energies. Although its limitation is observed, this approach results to a J/ψ suppression of around 0.30 at RHIC and 0.25 at LHC.
      With P.B. Gossiaux – J. Phys. Conf. Ser. 509 (2014) 012095
    • A quantum approach to dynamical quarkonia suppression in high energy heavy ion collisions
      The present thesis aims at studying the real-time evolution of correlated heavy quark/antiquark pairs described as open quantum systems which permanently interact with a cooling QGP. More explicitly, the continuous interaction between the medium and the pair internal degrees of freedom is obtained through 1) a temperature dependent color screening (“Debye” like) due to color charges in the irvicinity and 2) some fluctuation/dissipation mechanisms reflecting the continuous collisions. It leads to a dynamical and continuous picture of the dissociation, recombination and possible transitions to other bound states. This investigation is at the crossroads of different theoretical frameworks: semi-classic, quantum and quantum fields. The deduced predictions are compared to experimental data and to the results of other theoretical models.
      With P.B. Gossiaux – PhD Thesis – Subatech – École des Mines de Nantes (2015)
    • The Schrödinger-Langevin equation with and without thermal fluctuations
      The Schrödinger-Langevin (SL) equation is considered as an effective open quantum system formalism suitable for phenomenological applications involving a quantum subsystem interacting with a thermal bath. We focus on two open issues relative to its solutions: the stationarity of the excited states of the non-interacting subsystem when one considers the dissipation only and the thermal relaxation towards asymptotic distributions with the additional stochastic term. We first show that a proper application of the Madelung/polar transformation of the wave function leads to a non zero damping of the excited states of the quantum subsystem. We then study analytically and numerically the SL equation ability to bring a quantum subsystem to the thermal equilibrium of statistical mechanics. To do so, concepts about statistical mixed states and quantum noises are discussed and a detailed analysis is carried with two kinds of noise and potential. We show that within our assumptions the use of the SL equation as an effective open quantum system formalism is possible and discuss some of its limitations.
      With P.B. Gossiaux – Annals of Physics 368 (2016) 267-295
    • Upsilon suppression in the Schrödinger-Langevin approach
      We treat the question of bottomonia suppression in ultrarelativistic heavy ion collisions (URHIC) as a dynamical open quantum problem, tackled for the first time using the Schrödinger-Langevin equation. Coupling this equation to the EPOS2 event generator, predictions are made for the nuclear modification factor of Υ(1S) and Υ(2S).
      With P.B. Gossiaux – QM 2015 proceeding, Nuclear Physics A956 (2016) 737-740
    • Dynamical bottomonium-suppression in a realistic AA background
      We refine our dynamical Schroedinger-Langevin scheme designed for dealing with the suppression of quarkonium states in URHIC in order to allow for feed-downs from higher states and present updated results for the RAA as a function of the centrality.
      With P.B. Gossiaux – SQM 2016 proceeding, J. Phys. Conf. Ser. (2016)
    • Event-by-event vn correlations of soft hadrons and heavy mesons in heavy ion collisions
      Combining event-by-event hydrodynamics with heavy quark energy loss we compute correlations between the heavy and soft sectors for elliptic and triangular flow harmonics v2 and v3 of D0 mesons in PbPb collisions at 2.76 TeV and 5.02 TeV. Our results indicate that v3 is strongly influenced by the fragmentation temperature and that it builds up later than v2 during the evolution of the system.
      With Caio A. G. Prado, Jacquelyn Noronha-Hostler, Jorge Noronha, Marcelo G. Munhoz, Alexandre A. P. Suaide – QM 2017 proceeding, Nucl. Phys. A967 (2017) 664-667.
    • Event-by-event correlations between soft hadrons and D0 mesons in 5.02 TeV PbPb collisions at LHC
      In this paper heavy quark energy loss models are embedded in full event-by-event viscous hydrodynamic simulations to investigate the nuclear suppression factor and azimuthal anisotropy of D0 mesons in PbPb collisions at 5.02 TeV in the pT range 8-40 GeV. In our model calculations, the RAA of D0 mesons is consistent with experimental data from the CMS experiment. We present the first calculations of heavy flavor cumulants v2{2} and v3{2} (and also discuss v2{4}), which is also consistent with experimental data. Event-shape engineering techniques are used to compute the event-by-event correlation between the soft hadron vn and the heavy meson vn. We predict a linear correlation between these observables on an event-by-event basis.
      With Caio A. G. Prado, Jacquelyn Noronha-Hostler, Jorge Noronha, Marcelo G. Munhoz, Alexandre A. P. Suaide – Phys. Rev. C 96, 064903 (2017)
    • Heavy-flavor dynamics in event-by-event viscous hydrodynamic backgrounds
      We investigate the effects of (2+1)d event-by-event fluctuating hydrodynamic backgrounds on the nuclear modification factor and momentum anisotropies of heavy-flavor mesons. Using the state-of-the-art D and B mesons modular simulation code (the so-called DAB-mod), updated recently with heavy-light quark coalescence, we perform a systematic comparison of different transport equations, including two energy loss models and a relativistic Langevin model with two drag parametrizations. We present the resulting D0 meson RAA, v2 and v3, using the multiparticle cumulant method, in Pb-Pb collisions at 5.02 TeV and compare them to the latest experimental data. We investigate the v2{4}/v2{2} ratio as a function of centrality for different initial conditions (MCKLN vs. Trento) and different system geometries and sizes (coming from Pb-Pb collisions at 5.02 TeV, spherical and prolate Xe-Xe collisions at 5.44 TeV).
      With Caio A. G. Prado, Jacquelyn Noronha-Hostler, Jorge Noronha, Marcelo G. Munhoz, Alexandre A. P. Suaide – Hard Probes 2018 proceeding – PoS HardProbes2018 (2018) 030
    • Sensitivity of D meson azimuthal anisotropies to system size and nuclear structure
      Recent experimental data at the Large Hadron Collider (LHC) confirmed that the soft sector azimuthal anisotropies in central XeXe collisions are sensitive to deformations in the wave function of the Xenon nucleus. Additionally, the CMS experiment found that D meson flow is slightly suppressed compared to other particle species when considering quark number scaling in small systems of pPb compared to PbPb. In this talk we used the D and B Mesons Modular (DAB-MOD) code coupled to Trento+v-USPhydro to calculate the RAA and vn’s of D mesons using different energy loss models and Langevin techniques. Comparing D mesons RAA and vn in PbPb to XeXe collisions it is found that in central collisions D meson azimuthal anisotropies are sensitive to details in the nuclear structure wave function of Xenon. Additionally, we find that in mid-central collisions the smaller system size of XeXe suppresses D meson flow.
      With Caio A. G. Prado, Jacquelyn Noronha-Hostler, Jorge Noronha, Alexandre A. P. Suaide, Marcelo G. Munhoz – proceeding for the 13th annual International Workshop on High pT Physics.
    • DAB-MOD sensitivity study of heavy flavor RAA
      and azimuthal anisotropies based on beam energy, initial conditions, hadronization, and suppression mechanisms
      Heavy flavor probes provide important information about the in-medium properties of the quark-gluon plasma produced in heavy-ion collisions. In this work, we investigate the effects of 2D+1 event-by-event fluctuating hydrodynamic backgrounds on the nuclear suppression factor and momentum anisotropies of heavy flavor mesons and non-photonic electrons. Using the state-of-the-art D and B mesons modular simulation code (called « DAB-MOD »), we perform a systematic comparison of different transport equations in the same background, including a few energy loss models – with and without energy loss fluctuations – and a relativistic Langevin model with different drag parametrizations. We present the resulting D and B mesons RAA, v2, v3, and v4 as well as multi-particle cumulants, in AuAu collisions at 200GeV and PbPb collisions at 2.76TeV and 5.02TeV, and compare them to the available experimental data. The v2{4}/v2{2} ratio, which is known to be a powerful probe of the initial conditions and flow fluctuations in the soft sector, is also studied in the context of heavy flavor. We also investigate the correlations between the transverse anisotropies of heavy mesons and all charged particles to better understand how heavy quarks couple to the hydrodynamically expanding quark-gluon plasma. We study the influence that different initial conditions and the implementation of heavy-light quark coalescence has on our results.
      With Caio A. G. Prado, Jacquelyn Noronha-Hostler, Jorge Noronha, Alexandre A. P. Suaide – submitted to PRC (2019)
    • System size scan of D meson RAA and vn using PbPb, XeXe, ArAr, and OO collisions at LHC
      Experimental measurements indicate no suppression (e.g. RpPb∼1) but a surprisingly large D meson v2 was measured in pPb collisions. In order to understand these results we use Trento+v-USPhydro+DAB-MOD to make predictions and propose a system size scan at the LHC involving 208^PbPb, 129^XeXe, 40^ArAr, and 16^OO collisions. We find that the nuclear modification factor approaches unity as the system size is decreased, but nonetheless, in the 0-10% most central collisions v2{2} is roughly equivalent regardless of system size. These results arise from a rather non-trivial interplay between the shrinking path length and the enhancement of eccentricities in small systems at high multiplicity. Finally, we also find a surprising sensitivity of D mesons v2{2} in 0-10% at pT=2−5 GeV to the slight deformation of 129^Xe recently found at LHC.
      With Caio A. G. Prado, Jacquelyn Noronha-Hostler, Alexandre A. P. Suaide – submitted to PRL (2019)
    • D meson sensitivity to a system size scan at LHC
      Experimental measurements in pA collisions indicate no D meson suppression (RpPb∼1) but a surprisingly large v2. To better understand these results we propose a system size scan at the LHC involving 16^OO, 40^ArAr, 129^XeXe and 208^PbPb collisions. Using Trento+ v-USPhydro+DAB-MOD to make predictions, we find that the RAA tends towards unity when the system size is decreased, but nonetheless, in the most central collisions v2{2} is almost independent of the colliding system. These results are analyzed in light of path length and initial eccentricity variations.
      With Caio A. G. Prado, Jacquelyn Noronha-Hostler, Alexandre A. P. Suaide – proceeding of Strangeness in Quark Matter (SQM 2019)

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