216 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
Bose-Einstein Correlations for Expanding Finite Systems or from a Hot Fireball to a Snow-Flurry
Most boson emitting sources contain a core of finite dimensions surrounded by
a large halo, due to long-lived resonances like etc.
When the Bose-Einstein correlation (BEC) function of the core can be determined
we show that its intercept () measures, as a function of momentum, the
square of the fraction of core particles produced. A simultaneos measurement of
BEC and the single-particle distributions can thus determine the
characteristics of the core. If the geometrical sizes of the core are
sufficiently large the parameters of the BEC function obey the -scaling
observed in and reactions at CERN. The model can describe the
measurements of the single- and two-particle distributions in the central
region of reactions. A fit to experimental data shows that the freeze-out
of hadrons occurs at a larger volume and at a much lower temperature than that
given by the measurement of the inverse slope of the -spectrum and
standard BEC analysis.Comment: ReVTeX, LaTeX, 21 pages, one table, no figures; Proceedings of the
International Symposium on Quantum Interferometry Studies in High Energy
Nuclear Collisions, 18-20 April, 1995, Hiroshima, Japan, in pres
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
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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