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Particle correlations at RHIC  scrutiny of a puzzle
(2002)

Sven Soff
Steffen A. Bass
David H. Hardtke
Sergey Y. Panitkin
 We present calculations of twopion and twokaon correlation functions in relativistic heavy ion collisions from a relativistic transport model that includes explicitly a firstorder phase transition from a thermalized quarkgluon 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 inmedium modifications, for example, a broadening of the rhomeson, on the correlation radii. In particular, the longitudinal correlation radius R_long is reduced, improving the comparison to data.

(Strange) meson interferometry at RHIC
(2002)

Sven Soff
Steffen A. Bass
David H. Hardtke
Sergey Y. Panitkin
 We make predictions for the kaon interferometry measurements in Au+Au collisions at the Relativistic Heavy Ion Collider (RHIC). A first order phase transition from a thermalized QuarkGluonPlasma (QGP) to a gas of hadrons is assumed for the transport calculations. The fraction of kaons that are directly emitted from the phase boundary is considerably enhanced at large transverse momenta K T ~ 1 GeV/c. In this kinematic region, the sensitivity of the R out/R side ratio to the QGPproperties is enlarged. Here, the results of the 1dimensional correlation analysis are presented. The extracted interferometry radii, depending on KTheta, are not unusually large and are strongly affected by momentum resolution effects.

HBT interferometry and the partonhadron phase transition
(2002)

Sven Soff
 Invited talk at the International Workshop XXX on Gross Properties of Nuclei and Nuclear Excitations  Ultrarelativistic HeavyIon Collisions, Jan. 1319, 2002, Hirschegg, Austria. Reportno: LBNL49674. We discuss predictions for the pion and kaon interferometry measurements in relativistic heavy ion collisions at SPS and RHIC energies. In particular, we confront relativistic transport model calculations that include explicitly a firstorder phase transition from a thermalized quarkgluon plasma to a hadron gas with recent data from the RHIC experiments. We critically examine the "HBTpuzzle" both from the theoretical as well as from the experimental point of view. Alternative scenarios are briefly explained.