Geometry and Space-Time Extent of Pion Emission Region at FCC Energies

Figure 5

Energy dependence of estimations for charged particle density and for critical one in collisions. Points are calculated with help of the hybrid function for [17] and the experimental estimations for and uncertainties for points are propagated from statistical errors of measurements and fits used. Solid lines correspond to the hybrid approximation of [17] and dashed lines are for 3NLO pQCD equation [18] while thick lines show results with calculated with the fits of BEC radii by (7) in case (ii.1) and thin lines with the fits by specific case Critical charged particle density is shown by dotted line with its statistical uncertainty levels represented by thin dotted lines. The heavy grey lines correspond to the systematic s.d. of calculated by varying of on .