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

Figure 5

Dependence of scaled difference of squares of transverse radii on collision energy for emission region of secondary charged pion in various nucleus-nucleus collisions at  GeV/. Experimental results are shown for the same particle types and Coulomb corrections as well as in Figure 4. Error bars are only statistical (for NA44, total uncertainties). Dotted line is the level . Smooth curves are derived from (6) and the fit results for , . The solid line corresponds to the fits of scaled HBT radii by function (7) and dashed line to the fits by specific case , .