Azimuthally Integrated HBT Parameters for Charged Pions in Nucleus-Nucleus Interactions versus Collision Energy

Figure 2

Energy dependence of emission duration for secondary charged pions in central heavy ion collisions , , in midrapidity region and at  GeV/. Experimental results are shown for the same particle types and Coulomb corrections as well as in Figure 1. Error bars are only statistical (for NA44, total uncertainties). Smooth curves are derived from (5) and the fit results for , without the point of the WA97 experiment [11]. The solid line corresponds to the fits of HBT radii by function (7) and dashed line to the fits by specific case , .