Rapidity Gaps in Quark and Gluon Jets - a Perturbative Approach

We derive the probability for rapidity gaps in a parton cascade and investigate the dual connection with hadronic final states. A good description of observations in ee-annihilations is obtained by perturbative QCD calculations in MLLA using previously determined parameters (QCD scale Λ and kT -cut-off Q0) and applying the parton hadron duality picture. Further predictions are derived; especially, for gaps between jets at variable resolution we predict a strong variation of gap probabilities for small parameters ycut → 0 in the transition from jets to hadrons. Large gaps between partons correspond to large spatial separations of colour charges: a colour blanching mechanism by soft processes is suggested.