Abstract:
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.