We show that experimental data are in very good agreement with predict
ions from the string fragmentation model by Bowler and Morris. We pres
ent a physical interpretation and discuss the relation to results obta
ined from Perturbative QCD and Local Hadron Parton Duality (LPHD). We
also present implications for B pi correlations and the possibility to
use these as a tag to study CP violation in B decays.