Publications

–> All my publications can be found on Inspire-HEP <–

Below, a list of selected publications:

• • One-dimensional complex potentials for quarkonia in a quark-gluon plasma
    Master equations of the Lindblad type have recently been derived to describe the dynamics of quarkonium states in the quark-gluon plasma. Because their full resolution in three dimensions is very challenging, the equations are often reduced to one dimension. The main ingredient of these equations is the complex potential that describes the binding of the heavy quark-antiquark pairs and their interactions with the medium. In this work, we propose a one-dimensional complex potential parameterized to reproduce at best two key properties — the temperature-dependent masses of the eigenstates and their decay widths — of a three-dimensional lattice QCD inspired potential. Their spectral decompositions are calculated to check their compatibility with the positivity of the master equations.
    With Stéphane Delorme and Pol-Bernard Gossiaux – European Physical Journal A (2022)

• • Quarkonium dynamics inside the quark-gluon plasma using open quantum systems
    In recent years, a significant theoretical effort has been made towards a dynamical description of quarkonia inside the Quark-Gluon Plasma (QGP), using the open quantum systems formalism. In this framework, one can get a real-time description of a quantum system (here the quarkonium) in interaction with a thermal bath (the QGP) by integrating out the bath degrees of freedom and studying the system reduced density matrix. We investigate the real-time dynamics of a correlated heavy quark-antiquark pair inside the QGP using a quantum master equation previously derived from first QCD principles in [4]. The full equation is directly resolved in 1D to lessen computing costs and is used for the first time to gain insight on the dynamics in both a static and evolving medium following a Björken-like temperature evolution.
    With Stéphane Delorme, Thierry Gousset and Pol-Bernard Gossiaux – EPJ Web of Conferences (2022)

• • System size scan of D meson R_AA and v_n using PbPb, XeXe, ArAr, and OO collisions at LHC
    Experimental measurements indicate no suppression (e.g. R_pPb∼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 ²⁰⁸PbPb, ¹²⁹XeXe, ⁴⁰ArAr, and ¹⁶OO 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 p_T=2−5 GeV to the slight deformation of ¹²⁹Xe recently found at LHC.
    With Jacquelyn Noronha-Hostler, Caio A. G. Prado, Alexandre A. P. Suaide – Physical Review C (2020)

• • DAB-MOD sensitivity study of heavy flavor R_AA 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 R_AA, v₂, v₃, and v₄ as well as multi-particle cumulants, in AuAu collisions at 200GeV and PbPb collisions at 2.76 TeV and 5.02 TeV, 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 – Physical Review C (2020)

• • 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 p_T range 8-40 GeV. In our model calculations, the R_AA 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 v_n. 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 – Physical Review C (2017)

• • 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 R_AA as a function of the centrality.
    With Pol-Bernard Gossiaux – Journal of Physics: Conference Series (2016)

• • 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 Pol-Bernard Gossiaux – Annals of Physics 368 (2016) 267-295

• • 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 Pol-Bernard Gossiaux – PhD Thesis – Subatech (2015)

• • Inclusive polarised J/ψ production in high energy hadron collisions
    We study the inclusive polarised and unpolarised productions of J/ψ coming from χ_c 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 Roman Pasechnik – Master Thesis – THEP Lund (2012)