51 research outputs found
Heavy-flavor hadronization mechanism from pp to AA collisions: a theoretical perspective
The interest in studying heavy-flavor hadronization in high-energy nuclear
collisions is twofold. On one hand hadronization represents a source of
systematic uncertainties in phenomenological attempts of extracting
heavy-flavor transport coefficients in the Quark Gluon Plasma which one assumes
to be produced in the collision. Hence, developing the most possible reliable
model for this process is important to get a precise and accurate estimate of a
fundamental property of hot QCD. On the other hand studying how hadronization
changes in the presence of a dense medium of colored partons can be considered
an issue of interest by itself. In particular, the observation of modifications
of heavy-flavor hadronization in proton-proton collisions strongly suggests
that also in this case a small droplet of Quark-Gluon Plasma can be formed.
Here we try to provide a general overview on heavy-flavor hadronization, from
pp to AA collisions, stressing the aspects and challenges common to all
mechanisms proposed in the literature. Then, focusing on a particular model, we
show how a consistent description of several observables involving heavy-flavor
hadrons can be obtainedComment: Proceedings of the Hard Probes 2023 conferenc
Real and imaginary-time quarkonium correlators in a hot plasma
The possibility of describing the behavior of a pair in a hot
plasma in terms of an effective potential is investigated. It is shown that as
long as medium effects can be embodied in a gaussian action, like in the QED
case, the propagator obeys a closed temporal evolution equation
whose large-time behavior is governed by an effective potential. The latter,
beside screening, displays also an imaginary part related to collisions.Comment: Talk given at the 8-th Conference "Quark Confinement and the Hadron
Spectrum", Mainz, Germany, 1-6 September 200
How (non-) linear is the hydrodynamics of heavy ion collisions?
We provide evidence from full numerical solutions that the hydrodynamical
evolution of initial density fluctuations in heavy ion collisions can be
understood order-by-order in a perturbative series in deviations from a smooth
and azimuthally symmetric background solution. To leading linear order, modes
with different azimuthal wave numbers do not mix. Quadratic and higher order
corrections are small and can be understood as overtones with corresponding
wave numbers.Comment: 8 pages, 4 figure
A perturbative approach to the hydrodynamics of heavy ion collisions
Initial fluctuations in hydrodynamic fields such as energy density or flow
velocity give access to understanding initial state and equilibration physics
as well as thermodynamic and transport properties. We provide evidence that the
fluid dynamic propagation of fluctuations of realistic size can be based on a
background-fluctuation splitting and a systematic perturbative expansion in the
fluctuating fields. Initial conditions are characterized by a Bessel-Fourier
expansion for single events, event-by-event correlations and probability
distributions. The evolution equations can be solved order-by-order in the
expansion which allows to study the fluid dynamical propagation of single
modes, the study of interaction effects between modes, the determination of the
associated particle spectra and the generalization of the whole program to
event-by-event correlations and distributions.Comment: poceedings of the XXIV Quark Matter conference (2014
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