620 research outputs found
Single particle inclusive spectra, HBT and elliptic flow; a consistent picture at RHIC?
In these proceedings we will present the preliminary identified single
particle inclusive spectra, the identified particle elliptic flow and the HBT
versus the reaction plane measured with the STAR detector at RHIC. So far none
of the theoretical space-time models has been able to describe the combination
of these measurements consistently. In order to see if our measurements can be
understood in the context of a simple hydro-motivated blast wave model we
extract the relevant parameters for this model, and show that it leads to a
consistent description of these observables.Comment: 9 pages, 5 figures (in eps) talk given at XXXI International
Symposium on Multiparticle Dynamics, Sep. 1-7, 2001, Datong China URL
http://ismd31.ccnu.edu.cn
Heavy Ion Collisions
Lattice QCD predicts a phase transition between hadronic matter and a system
of deconfined quarks and gluons (the Quark Gluon Plasma) at high energy
densities. Recent results from the Brookhaven Relativistic Heavy Ion Collider
(RHIC) dedicated to the study of QCD at extreme densities will be discussed and
compared to measurements obtained at the CERN Super Proton Synchrotron (SPS).Comment: Invited talk at the XXIII Physics in Collisions Conference (PIC03),
Zeuthen, Germany, June 2003, 14 pages, LaTeX, 13 eps figures. PSN SAAT0
How much does the hadronic phase contribute to the observed anisotropic flow at the LHC?
Elliptic flow signals the presence of multiple interactions between the
constituents of the created matter in heavy-ion collisions. This includes
possible contributions from the different phases, including the hadronic phase.
In these proceedings I will first show that the energy dependence of elliptic
flow, based on recent ALICE and STAR beam energy scan measurements, can largely
be understood in terms of a boosted thermal system. In addition, a detailed
comparison between the identified particle elliptic flow measured by the ALICE
collaboration and viscous hydrodynamical model calculations with and without a
hadronic afterburner is performed to constrain the possible effects of
individual hadron-hadron re-interaction cross-sections.Comment: 10 pages, 8 figures, proceedings Resonance Workshop at Catania,
version two updated with referee comment
Collective flow and viscosity in relativistic heavy-ion collisions
Collective flow, its anisotropies and its event-to-event fluctuations in
relativistic heavy-ion collisions, and the extraction of the specific shear
viscosity of quark-gluon plasma (QGP) from collective flow data collected in
heavy-ion collision experiments at RHIC and LHC are reviewed. Specific emphasis
is placed on the similarities between the Big Bang of our universe and the
Little Bangs created in heavy-ion collisions.Comment: 38 pages (incl. 11 figures), 145 references. Invited review prepared
for Annual Review in Nuclear and Particle Physics 63 (2013
Collective phenomena in non-central nuclear collisions
Recent developments in the field of anisotropic flow in nuclear collision are
reviewed. The results from the top AGS energy to the top RHIC energy are
discussed with emphasis on techniques, interpretation, and uncertainties in the
measurements.Comment: Review paper, 56 pages, as accepted for publicatio
Anisotropic distributions in a multi-phase transport model
With A Multi-Phase Transport (AMPT) model we investigate the relation between
the magnitude, fluctuations and correlations of the initial state spatial
anisotropy and the final state anisotropic flow coefficients
in Au+Au collisions at 200 GeV. It is found
that the relative eccentricity fluctuations in AMPT account for the observed
elliptic flow fluctuations, in agreement with measurements of the STAR
collaboration. In addition, the studies based on 2- and multi-particle
correlations and event-by-event distributions of the anisotropies suggest that
the Elliptic-Power function is a promising candidate of the underlying
probability density function of the event-by-event distributions of
as well as . Furthermore, the correlations between
different order symmetry planes and harmonics in the initial coordinate space
and final state momentum space are presented. Non-zero values of these
correlations have been observed. The comparison between our calculations and
data will, in the future, shed new insight into the nature of the fluctuations
of the Quark-Gluon Plasma produced in heavy ion collisions.Comment: 10 pages, 8 figures, accepted by PR
A transverse momentum differential global analysis of Heavy Ion Collisions
The understanding of heavy ion collisions and its quark-gluon plasma
formation requires a complicated interplay of rich physics in a wealth of
experimental data. In this work we compare for identified particles the
transverse momentum dependence of both the yields and the anisotropic flow
coefficients for both PbPb and Pb collisions. We do this in a global model
fit including a free streaming prehydrodynamic phase with variable velocity
, thereby widening the scope of initial conditions. During the
hydrodynamic phase we vary three second order transport coefficients. The free
streaming velocity has a preference slightly below the speed of light. In this
extended model the bulk viscosity is small and even consistent with zero.Comment: 6 pages, 6 figures, see also the companion paper "A Bayesian analysis
of Heavy Ion Collisions with Trajectum
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