231 research outputs found
Bose-Einstein Correlations for Expanding Finite Systems
There are two length-scales present simultaneously in all the principal
directions for three-dimensionally expanding, finite systems. These are
discussed in detail for the case of a longitudinally expanding system with a
transverse flow and a transverse temperature profile. For systems with large
geometrical sizes we find an -scaling for the parameters of the
Bose-Einstein correlation function, which may be valid in the whole transverse
mass region for certain model parameters. In this limit, the Bose-Einstein
correlations view only a small part of the source. The large geometrical sizes
can be inferred from a simultaneous analysis of the invariant momentum
distribution and the Bose-Einstein correlation function. A preliminary analysis
of the NA44 data indicates that instead of a small fireball we are observing a
big and expanding snowball in reactions at CERN SPS energies.Comment: 5 pages, no figures, ReVTeX, uses espcrc1.sty, Quark Matter'95
conference, Nucl. Phys. A in pres
The reconstructed final state of Pb + Pb 158 AGeV reactions from spectra and correlation data of NA49, NA44 and WA98
The final state of Pb + Pb reactions at CERN SPS has been reconstructed with
the Buda-Lund hydro model, by performing a simultaneous fit to NA49, NA44 and
WA98 data on particle correlations and spectra.Comment: 4 pages, LaTeX, 4 EPS figures, 1 table; presented at QM9
A hint at quark deconfinement in 200 GeV Au+Au data at RHIC
We give the emission function of the axially symmetric Buda-Lund hydro model
and present its simultaneous, high quality fits to identified particle spectra,
two-particle Bose-Einstein or HBT correlations and charged particle
pseudorapidity distributions as measured by BRAHMS and PHENIX in 0-30 %
central, \sqrt{s_{\NN}} = 200 GeV Au+Au collisions at RHIC. The best fit is
achieved when the most central region of the particle emitting volume is
superheated to MeV MeV, a preliminary,
3 effect.Comment: 10 pages, 3 figures, talk of A. Ster at the 2nd Warsaw Meeting on
Correlations and Resonances in HIC, see
http://hirg.if.pw.edu.pl/en/meeting/oct2003/talks/csorgo/Ster.pp
An indication for deconfinement in Au+Au collisions at RHIC
We present simultaneous, quality fits to final BRAHMS, PHENIX, PHOBOS and
STAR data on particle spectra and two-particle Bose-Einstein or HBT
correlations as measured in Au+Au collisions at GeV.
Using the Buda-Lund hydro model, the best fit is achieved when the most central
1/8th of the particle emitting volume is superheated to MeV. In
contrast, we find no indication for such a hot central region in a similar
analysis of Pb+Pb data at CERN SPS.Comment: 6 pages, 2 figures, 1 table, presented by A. Ster at the XXXIIIth
International Symposium on Multiparticle Dynamics, Cracow, Poland, Sept. 200
Understanding the rapidity dependence of the elliptic flow and the HBT radii at RHIC
The pseudo-rapidity dependence of the elliptic flow at various excitation
energies measured by the PHOBOS Collaboration in Au+Au collisions at RHIC is
one of the surprising results that has not been explained before in terms of
hydrodynamical models. Here we show that these data are in agreement with
theoretical predictions and satisfy the universal scaling relation predicted by
the Buda-Lund hydrodynamical model, based on exact solutions of perfect fluid
hydrodynamics. We also show a theoretical prediction on the rapidity and
transverse momentum scaling of the HBT radii measured in heavy ion collisions,
based on the Buda-Lund model.Comment: 6 pages, 2 figures, proceedings contribution for M. Csanad's talk at
the Workshop on Particle Correlations and Femtoscopy 2005, Kromeri
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