Speaker
Robert Vertesi
(Nuclear Physics Institute of the Czech Academy of Sciences)
Description
Three-dimensional source extraction techniques allow us to get an
insight to the space-time extent and the freezeout dynamics of the hot and dense medium created in RHIC high energy heavy ion collisions, using Bose-Einstein correlated like-sign hadron pairs. Three-dimensional analyses of the pion source revealed a heavy, non-Gaussian tail in the "out" direction. The interpretation of these pion sources in terms of pure hydrodynamical evolution is, however, complicated by the strong contribution of feed-down from long-lived resonances to the source. On the other hand, kaons provide a much cleaner probe of the expanding fireball.
We present a recent three-dimensional kaon correlation analysis in
central Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV, using
Cartesian harmonics decomposition technique. We compare the three-dimensional spatial source function of kaons to that of pions, and
to a thermal model of source evolution. We also present results on the three-dimensional extent of the kaon source with respect to the pair transverse momentum, and compare it to predictions of two different hydrodynamical models.
Author
Robert Vertesi
(Nuclear Physics Institute of the Czech Academy of Sciences)
