1,451 research outputs found
Topics on Hydrodynamic Model of Nucleus-Nucleus Collisions
A survey is given on the applications of hydrodynamic model of
nucleus-nucleus collisons, focusing especially on i) the resolution of
hydrodynamic equations for arbitrary configurations, by using the
smoothed-particle hydrodynamic approach; ii) effects of the event-by-event
fluctuation of the initial conditions on the observables; iii) decoupling
criteria; iv) analytical solutions; and others.Comment: 30 pages, 29 figures; corrected typo
On the necessity to include event-by-event fluctuations in experimental evaluation of elliptical flow
Elliptic flow at RHIC is computed event-by-event with NeXSPheRIO. We show
that when symmetry of the particle distribution in relation to the reaction
plane is assumed, as usually done in the experimental extraction of elliptic
flow, there is a disagreement between the true and reconstructed elliptic flows
(15-30% for =0, 30% for =0.5 GeV). We suggest a possible way to
take into account the asymmetry and get good agreement between these elliptic
flows
Simple solutions of relativistic hydrodynamics for longitudinally expanding systems
Simple, self-similar, analytic solutions of 1+1 dimensional relativistic
hydrodynamics are presented, generalizing Bjorken's solution to inhomogeneous
rapidity distribution.Comment: 12 pages, elsart.cls, 2 eps figure
Simple solutions of relativistic hydrodynamics for systems with ellipsoidal symmetry
Simple, self-similar, analytic solutions of (1+3)-dimensional relativistic
hydrodynamics are presented for ellipsoidally symmetric finite fireballs
corresponding to non-central collisions of heavy ions at relativistic
bombarding energies. The hydrodynamical solutions are obtained for a new,
general family of equations of state with the possibility of describing phase
transitions.Comment: 13 pages, no figures, uses elsart.cl
Event-by-event analysis of ultra-relativistic heavy-ion collisions in smoothed particle hydrodynamics
The method of smoothed particle hydrodynamics (SPH) is applied for
ultra-relativistic heavy-ion collisions. The SPH method has several advantages
in studying event-by-event fluctuations, which attract much attention in
looking for quark gluon plasma (QGP) formation, because it gives a rather
simple scheme for solving hydrodynamical equations. Using initial conditions
for Au+Au collisions at RHIC energy produced by NeXus event generator, we solve
the hydrodynamical equation in event-by-event basis and study the fluctuations
of hadronic observables such as dN/dy due to the initial conditions. In
particular, fluctuations of elliptic flow coefficient v2 is investigated for
both the cases, with and without QGP formation. This can be used as an
additional test of QGP formation.Comment: LaTeX, 16 figures, 3 tables, 23 pages. Talk presented at 6th
International Workshop on Relativistic Aspects of Nuclear Physics(RANP2000),
Caraguatatuba, Tabatinga Beach, Sao Paulo, Brazil, October 17-20, 2000. To be
published in the proceedings (World Scientific, Singapore
Antihyperon polarization in high-energy inclusive reactions
We propose a model for the antihyperon polarization in high-energy
proton-nucleus inclusive reactions, based on the final-state interactions
between the antihyperons and other produced particles (predominantly pions). To
formulate this idea, we use the previously obtained low-energy
pion-(anti-)hyperon interaction using effective chiral Lagrangians, and a
hydrodynamic parametrization of the background matter, which expands and
decouples at a certain freezeout temperature.Comment: 17 pages, 10 figure
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