1,979 research outputs found
Hydrodynamic modeling of deconfinement phase transition in nuclear collisions
The (3+1)-dimensional ideal hydrodynamics is used to simulate collisions of
gold nuclei with bombarding energies from 1 to 160 GeV per nucleon. The initial
state is represented by two cold Lorentz-boosted nuclei. Two equations of
state: with and without the deconfinement phase transition are used. We have
investigated dynamical trajectories of compressed baryon-rich matter as
functions of various thermodynamical variables. The parameters of collective
flow and hadronic spectra are calculated. It is shown that presence of the
deconfinement phase transition leads to increase of the elliptic flow and to
flattening of proton rapidity distributions.Comment: 11 pages, 6 figure
A Cone Jet-Finding Algorithm for Heavy-Ion Collisions at LHC Energies
Standard jet finding techniques used in elementary particle collisions have
not been successful in the high track density of heavy-ion collisions. This
paper describes a modified cone-type jet finding algorithm developed for the
complex environment of heavy-ion collisions. The primary modification to the
algorithm is the evaluation and subtraction of the large background energy,
arising from uncorrelated soft hadrons, in each collision. A detailed analysis
of the background energy and its event-by-event fluctuations has been performed
on simulated data, and a method developed to estimate the background energy
inside the jet cone from the measured energy outside the cone on an
event-by-event basis. The algorithm has been tested using Monte-Carlo
simulations of Pb+Pb collisions at TeV for the ALICE detector at
the LHC. The algorithm can reconstruct jets with a transverse energy of 50 GeV
and above with an energy resolution of .Comment: 13 pages, 7 figure
Longitudinal Flow of Protons from 2-8 AGeV Central Au+Au Collisions
Rapidity distributions of protons from central Au + Au
collisions measured by the E895 Collaboration in the energy range from 2 to 8
AGeV at the Brookhaven AGS are presented. Longitudinal flow parameters derived
using a thermal model including collective longitudinal expansion are extracted
from these distributions. The results show an approximately linear increase in
the longitudinal flow velocity, , as a function of the
logarithm of beam energy.Comment: 5 Pages, including 3 figures, 1 tabl
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