1,736 research outputs found
HBT and Fluctuations: Recent Results
We give an overview of the latest results of HBT and fluctuations studies in
heavy ion collisions presented during the Quark Matter 2001 Conference.Comment: Contribution to Quark Matter 2001 Conferenc
Pion Imaging at the AGS
Source imaging analysis was performed on two-pion correlations in central Au
+ Au collisions at beam energies between 2 and 8 GeV. We apply the imaging
technique by Brown and Danielewicz, which allows a model-independent extraction
of source functions with useful accuracy out to relative pion separations of
about 20 fm. We found that extracted source functions have Gaussian shapes.
Values of source functions at zero separation are almost constant across the
energy range under study. Imaging results are found to be consistent with
conventional source parameters obtained from a multidimensional HBT analysis.Comment: Talk given at Bologna 2000 - Structure of the Nucleus at the Dawn of
the Century, Bologna, Italia, May 29 - June 3, 200
Dissipation near the QCD phase transition
We set up a framework for field theoretical studies of systems out of thermal
equilibrium and zoom in on the dissipation of disoriented chiral condensates.
Short relaxation times are obtained in the phase transition region,
jeopardizing the definiteness of a DCC signal.Comment: 4 pages, 4 figures, espcrc.sty, to be published in the proceedings
PANIC02, Osaka, Japan, September 30 - October 4, 200
Kaon Interferometry: A Sensitive Probe of the QCD Equation of State?
We calculate the kaon HBT radius parameters for high energy heavy ion
collisions, assuming a first order phase transition from a thermalized
Quark-Gluon-Plasma to a gas of hadrons. At high transverse momenta K_T ~ 1
GeV/c direct emission from the phase boundary becomes important, the emission
duration signal, i.e., the R_out/R_side ratio, and its sensitivity to T_c (and
thus to the latent heat of the phase transition) are enlarged. Moreover, the
QGP+hadronic rescattering transport model calculations do not yield unusual
large radii (R_i<9fm). Finite momentum resolution effects have a strong impact
on the extracted HBT parameters (R_i and lambda) as well as on the ratio
R_out/R_side.Comment: 4 pages, 2 figure
Particle Correlations at RHIC - Scrutiny of a Puzzle
We present calculations of two-pion and two-kaon correlation functions in
relativistic heavy ion collisions from a relativistic transport model that
includes explicitly a first-order phase transition from a thermalized
quark-gluon plasma to a hadron gas. We compare the obtained correlation radii
with recent data from RHIC. The predicted R_side radii agree with data while
the R_out and R_long radii are overestimated. We also address the impact of
in-medium modifications, for example, a broadening of the rho-meson, on the
correlation radii. In particular, the longitudinal correlation radius R_long is
reduced, improving the comparison to data.Comment: 4 pages, 3 figure
Kaon interferometry : a sensitive probe of the QCD equation of state?
We calculate the kaon HBT radius parameters for high energy heavy ion collisions, assuming a first order phase transition from a thermalized Quark-Gluon-Plasma to a gas of hadrons. At high transverse momenta K_T ~ 1 GeV/c direct emission from the phase boundary becomes important, the emission duration signal, i.e., the R_out/R_side ratio, and its sensitivity to T_c (and thus to the latent heat of the phase transition) are enlarged. Moreover, the QGP+hadronic rescattering transport model calculations do not yield unusual large radii (R_i<9fm). Finite momentum resolution effects have a strong impact on the extracted HBT parameters (R_i and lambda) as well as on the ratio R_out/R_side
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