Sensitivity of pion interferometry to the microscopic dynamics of freeze-out

Abstract

We study the HBT interferometry of ultrarelativistic nuclear collisions using a freeze-out model in which free pions emerge in the course of the last binary collisions in the hadron gas. We show that the HBT correlators of both identical and nonidentical pions change with respect to the case of independent pion production. Practical consequences for the design of the event generator with the built in Bose-Einstein correlations are discussed. We argue that the scheme of inclusive measurement of the HBT correlation function does not require the symmetrization of the multipion transition amplitudes (wave functions).