1,196 research outputs found
Importance of Granular Structure in the Initial Conditions for the Elliptic Flow
We show effects of granular structure of the initial conditions (IC) of
hydrodynamic description of high-energy nucleus-nucleus collisions on some
observables, especially on the elliptic-flow parameter v2. Such a structure
enhances production of isotropically distributed high-pT particles, making v2
smaller there. Also, it reduces v2 in the forward and backward regions where
the global matter density is smaller, so where such effects become more
efficacious.Comment: 4 pages, 5 figure
Event-by-event fluctuations in hydrodynamical description of heavy-ion collisions
Effects caused by the event-by-event fluctuation of the initial conditions in
hydrodynamical description of high-energy heavy-ion collisions are
investigated. Non-negligible effects appear for several observable quantities,
even for a fixed impact parameter . They are sensitive to the equation
of state, being the dispersions of the observable quantities in general smaller
when the QGP phase appears at the beginning of hydrodynamic evolution than when
the fluid remains hadron gas during whole the evolution.Comment: 4 pages, 4 figures, talk presented to Quark Matter 2001 Conferenc
NeXSPheRIO results on azimuthal anisotropy in Au-Au collisions at 200A GeV
In this work, we present the results obtained by the hydrodynamic code
NeXSPheRIO on anisotropic flows. In our calculation, we made use of
event-by-event fluctuating initial conditions, and chemical freeze-out was
explicitly implemented. We studied directed flow, elliptic flow and forth
harmonic coefficient for various hadrons at different centrality windows for
Au+Au collisions at 200 AGeV. The results are discussed and compared with
experimental data from RHIC.Comment: 6 pages and 6 figures, sqm2008 contributio
Influence of tubular initial conditions on two-particle correlations
A unified description of the near-side and away-side structures observed in
two-particle correlations as function of delta eta-delta phi is proposed for
low to moderate transverse momentum. It is based on the combined effect of
tubular initial conditions and hydrodynamical expansion.Comment: 4 pages, 3 figures. Contribution to QM201
Probing the QGP Phase Boundary with Thermal Properties of Mesons
A novel attempt has been made to probe the QCD phase boundary by using the
experimental data for transverse momenta of {\phi} mesons produced in nuclear
collisions at AGS, SPS and RHIC energies. The data are confronted with simple
thermodynamic expectations and lattice QCD results. The experimental data
indicate a first-order phase transition, with a mixed phase stretching the
energy density between \sim1 and 3.2 GeV/fm3 corresponding to SPS energies.Comment: 8-pages, 3-figs, Replaced with the published versio
NeXSPheRIO Results on Elliptic-Flow Fluctuations at RHIC
By using the NexSPheRIO code, we study the elliptic-flow fluctuations in
Au+Au collisions at 200A GeV. It is shown that, by fixing the parameters of the
model to correctly reproduce the charged pseudo-rapidity and the
transverse-momentum distributions, reasonable agreement of with data is
obtained, both as function of pseudo-rapidity as well as of transverse
momentum, for charged particles. Our results on elliptic-flow fluctuations are
in good agreement with the recently measured data in experiments.Comment: 12 pages, 6 figures, prepared for the Workshop "Relativistic Nuclear
Physics: from Nuclotron to LHC Energies", June 18-22, 2007 (BITP, Kiev,
Ukraine
Hydrodynamic afterburner for the CGC at RHIC
Firstly, we give a short review about the hydrodynamic model and its
application to the elliptic flow phenomena in relativistic heavy ion
collisions. Secondly, we show the first approach to construct a unified model
for the description of the dynamics in relativistic heavy ion collisions.Comment: 15 pages, 7 figures, invited talk presented at "Hot Quarks 2004",
July 18-24, 2004, Taos Valley, NM, US
Covariant description of kinetic freeze out through a finite time-like layer
The Freeze Out (FO) problem is addressed for a covariant FO probability and a
finite FO layer with a time-like normal vector continuing the line of studies
introduced in Ref. [1]. The resulting post FO momentum distribution functions
are presented and discussed. We show that in general the post FO distributions
are non-thermal and asymmetric distributions even for time-like FO situations.Comment: 10 pages, 12 figures, major rewrite with changed content, corrected
typos and new references adde
Comparison of optical model results from a microscopic Schr\"odinger approach to nucleon-nucleus elastic scattering with those from a global Dirac phenomenology
Comparisons are made between results of calculations for intermediate energy
nucleon-nucleus scattering for 12C, 16O, 40Ca, 90Zr, and 208Pb, using optical
potentials obtained from global Dirac phenomenology and from a microscopic
Schr\"odinger model. Differential cross sections and spin observables for
scattering from the set of five nuclei at 65 MeV and 200 MeV have been studied
to assess the relative merits of each approach. Total reaction cross sections
from proton-nucleus and total cross sections from neutron-nucleus scattering
have been evaluated and compared with data for those five targets in the energy
range 20 MeV to 800 MeV. The methods of analyses give results that compare well
with experimental data in those energy regimes for which the procedures are
suited.Comment: 22 pages, 12 figure
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