Speaker
Senta V Greene
(Vanderbilt)
Description
Bose-Einstein correlations of identical hadrons provide information about
the space-time structure of the hadron emission source which reflects the
transition from the sQGP to the hadron gas stage in relativistic heavy ion
collisions. In the beam energy scan runs at RHIC, this analysis will can
provide a primary information for exploring the change from crossover to
first order phase transition is expected to occur.
The description of the measured correlation functions has been assumed to
be Gaussian, but a detailed analysis revealed that the statistically
correct assumption is a generalized Gaussian, the so-called Levy
distribution. One of the resulting source parameters, the Levy stability
parameter alpha, describing the shape of the source, is related to one of
the critical exponents (the so-called correlation exponent eta), and thus
may shed light on the location of the critical endpoint.
In this presentation we report the detailed measurement of the Levy source
parameters as a function of transverse mass in Au+Au collisions at
sqrt(s_NN)
= 39, 62 and 200GeV. We will also discuss a newly found scaling parameter,
Rhat, as a function of transverse mass (lambda(mT)).
Author
Senta V Greene
(Vanderbilt)
