Mass dependence of the HBT radii observed in e(+)e(-) annihilation

It is shown that the recently established strong mass-dependence of the rad ii of the hadron sources, as observed in HBT analyses of the e(+)e(-) annih ilation, 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 (i i) the "freeze-out" times are distributed along the hyperbola t(2) - z(2) = tau(0)(2).