[en] A recently proposed method of calculating experimental lower bounds, bsub(L), on the root-mean-squared impact parameter of multiparticle processes has been applied to a variety of reactions in π^-p interactions at 15 and 147 GeV/c. The values obtained for bsub(L) show a decrease of the root-mean-square impact parameter with increasing multiplicity at fixed energy and a very slow increase, if any, of bsub(L) with energy at fixed multiplicity. Furthermore, the results might indicate the absorption effects in multiparticle production in π^-p interactions are not important. The transverse momentum transfer correlation matrices calculated in this paper have a diagonal form in agreement with multiperipheral type models. (Auth.)