2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/48707It is shown that the recently established strong mass- dependence of the radii of the hadron sources, as observed in HBT analyses of the $e^+e^-$ annihilation, can be explained by assuming a generalized inside-outside cascade, i.e. that (i) the four-momenta and the space-time position four-vectors of the produced particles are approximately proportional to each other and (ii) the "freeze-out"times are distributed along the hyperbola $t^2 - z^2 = τ_0^2$.10 pages, 1 figure, Latex and epsfHigh Energy Physics - Phenomenologytext