Search results for: Jean-François Paquet

Items from 1 to 11 out of 11 results

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Bulk viscous effects on flow and dilepton radiation in a hybrid approach

Gojko Vujanovic, Jean-François Paquet, Sangwook Ryu, Chun Shen, more

Nuclear Physics A > 2017 > 967 > C > 692-695

Starting from IP-Glasma initial conditions, we investigate the effects of bulk pressure on low mass dilepton production at the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC) energies. Though thermal dilepton v2 is affected by the presence of both bulk and shear viscosity, whether or not these effects can be measured depends on the dilepton “cocktail” contribution to the...

article

Initial conditions for hydrodynamics from kinetic theory equilibration

Aleksi Kurkela, Aleksas Mazeliauskas, Jean-François Paquet, Sören Schlichting, more

Nuclear Physics A > 2017 > 967 > C > 289-292

We use effective kinetic theory to study the pre-equilibrium dynamics in heavy-ion collisions. We describe the evolution of linearized energy perturbations on top of out-of-equilibrium background to the energy-momentum tensor at a time when hydrodynamics becomes applicable. We apply this description to IP-Glasma initial conditions and find an overall smooth transition to hydrodynamics. In a phenomenologically...

article

Probing the space-time evolution of heavy ion collisions with photons and dileptons

Jean-François Paquet

Nuclear Physics A > 2017 > 967 > C > 184-191

Photons and dileptons are emitted throughout the evolution of the deconfined nuclear medium produced in heavy ion collisions. As such they can provide valuable information about the different phases of the medium, and complement hadronic measurements and other observables. In this work, recent developments related to electromagnetic emissions at early times, in the crossover region, and at late times...

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Phenomenological constraints on the bulk viscosity of QCD

Jean-François Paquet, Chun Shen, Gabriel Denicol, Sangyong Jeon, more

Nuclear Physics A > 2017 > 967 > C > 429-432

While small at very high temperature, the bulk viscosity of Quantum Chromodynamics is expected to grow in the confinement region. Although its precise magnitude and temperature-dependence in the cross-over region is not fully understood, recent theoretical and phenomenological studies provided evidence that the bulk viscosity can be sufficiently large to have measurable consequences on the evolution...

article

Thermal and prompt photons at RHIC and the LHC

Jean-François Paquet, Chun Shen, Gabriel Denicol, Matthew Luzum, more

Nuclear Physics A > 2016 > 956 > C > 409-412

Thermal and prompt photon production in heavy ion collisions is evaluated and compared with measurements from both RHIC and the LHC. An event-by-event hydrodynamical model of heavy ion collisions that includes shear and bulk viscosities is used, along with up-to-date photon emission rates. Larger tension with measurements is observed at RHIC than at the LHC. The center-of-mass energy and centrality...

article

Direct photon production and jet energy-loss in small systems

Chun Shen, Chanwook Park, Jean-François Paquet, Gabriel S. Denicol, more

Nuclear Physics A > 2016 > 956 > C > 741-744

Two types of penetrating probes, direct photon and QCD jets, are investigated in the background of a small and rapidly expanding droplet of quark-gluon plasma. The additional thermal electromagnetic radiation results in a ∼50% enhancement of the direct photons. In high multiplicity p+Pb collisions, jets can lose a sizeable fraction of their initial energy, leading to a charged hadron R_pA of ∼0.8 at...

article

Thermal photon anisotropic flow serves as a quark–gluon plasma viscometer

Chun Shen, Ulrich Heinz, Jean-François Paquet, Charles Gale

Nuclear Physics A > 2014 > 932 > C > 184-188

Photons are a penetrating probe of the hot and dense medium created in heavy-ion collisions. We present state-of-the-art calculations of viscous photon emission from nuclear collisions at RHIC and LHC. Thermal photons' anisotropic flow coefficients vn are computed, both with and without accounting for viscous corrections to the standard thermal emission rates. These corrections are found to have a...

article

Probing the early-time dynamics of relativistic heavy-ion collisions with electromagnetic radiation

Gojko Vujanovic, Jean-François Paquet, Gabriel S. Denicol, Matthew Luzum, more

Nuclear Physics A > 2014 > 932 > C > 230-234

Using 3 + 1D viscous relativistic fluid dynamics, we show that electromagnetic probes are sensitive to the initial conditions and to the out-of-equilibrium features of relativistic heavy-ion collisions. Within the same approach, we find that hadronic observables show a much lesser sensitivity to these aspects. We conclude that electromagnetic observables allow access to dynamical regions that are...

article

Extracting the bulk viscosity of the quark–gluon plasma

Jean-Bernard Rose, Jean-Francois Paquet, Gabriel S. Denicol, Matthew Luzum, more

Nuclear Physics A > 2014 > 931 > C > 926-930

We investigate the implications of a nonzero bulk viscosity coefficient on the azimuthal momentum anisotropy of ultracentral relativistic heavy ion collisions at the Large Hadron Collider. We find that, with IP-Glasma initial conditions, a finite bulk viscosity coefficient leads to a better description of the flow harmonics in ultracentral collisions. We then extract optimal values of bulk and shear...

article

Event-by-event direct photon anisotropic flow in relativistic heavy-ion collisions

Chun Shen, Jean-François Paquet, Jia Liu, Gabriel Denicol, more

Nuclear Physics A > 2014 > 931 > C > 675-680

We consider directly emitted and hadronic decay photons from event-by-event hydrodynamic simulations. We compute the direct photon anisotropic flow coefficients and compare with recent experimental measurements. We find that it is crucial to include the photon multiplicity as a weighting factor in the definition of vnγ. We also investigate the sensitivity of the direct photon spectrum and elliptic...

article

Probing the non-equilibrium dynamics of hot and dense QCD with dileptons

Gojko Vujanovic, Jean-François Paquet, Gabriel S. Denicol, Matthew Luzum, more

Nuclear Physics A > 2014 > 931 > C > 701-705

It is argued that, in heavy ion collisions, thermal dileptons are good probes of the transport properties of the medium created in such events, and also of its early-time dynamics, usually inaccessible to hadronic observables. In this work we show that electromagnetic azimuthal momentum anisotropies do not only display a sensitivity to the shear relaxation time and to the initial shear-stress tensor...

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Keywords

ELECTROMAGNETIC PROBES (3)
QUARK-GLUON PLASMA (3)
ANISOTROPIC FLOW (2)
BULK VISCOSITY (2)
HEAVY-ION COLLISIONS (2)
RELATIVISTIC VISCOUS HYDRODYNAMICS (2)
BOTTOM-UP THERMALIZATION (1)
DILEPTON AZIMUTHAL MOMENTUM ANISOTROPY (1)
DIRECT PHOTON FLOW PUZZLE (1)
DIRECT PHOTONS (1)
EFFECTIVE KINETIC THEORY (1)
ELECTROMAGNETIC RADIATION (1)
EVENT-BY-EVENT (1)
HEAVY ION COLLISIONS (1)
INITIAL CONDITIONS OF RELATIVISTIC HEAVY-ION COLLISIONS (1)
JET ENERGY LOSS (1)
OUT-OF-EQUILIBRIUM INITIAL CONDITIONS (1)
PHOTON MULTIPLICITY WEIGHTING (1)
PRE-EQUILIBRIUM DYNAMICS (1)
QUARK GLUON PLASMA (1)
QUARK–GLUON PLASMA (1)
RELATIVISTIC DISSIPATIVE HYDRODYNAMICS (1)
RELATIVISTIC HEAVY-ION COLLISIONS (1)
SHEAR RELAXATION TIME (1)
SHEAR VISCOUS CORRECTIONS (1)
SMALL COLLISION SYSTEMS (1)
TEMPERATURE DEPENDENT SHEAR VISCOSITY (1)
THERMAL PHOTONS (1)
TRANSPORT COEFFICIENTS OF STRONGLY INTERACTING MEDIA (1)
ULTRACENTRAL RELATIVISTIC HEAVY ION COLLISIONS (1)
ULTRARELATIVISTIC HEAVY ION COLLISONS (1)
VISCOUS RELATIVISTIC HYDRODYNAMICS (1)
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Search results for: Jean-François Paquet

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