  A preliminary study of the fragmentation properties of charged particle jets
as a function of the Underlying Multiplicity (UM) is presented. The UM is
defined such that it can be related to the global soft event characteristics by
excluding the contribution due to jet fragmentation. The measurement of jet
properties as a function of the UM might be connected to the impact parameter
dependence of the transverse nucleon structure as described via Generalized
Parton Distributions. The results from the studies are compared to Monte Carlo
(MC) models.
