  We present an updated version of the QCD-based colour reconnection model in
PYTHIA8, where we constrain the range in impact parameter for which
reconnections are allowed. In this way, we can introduce more realistic colour
reconnections in the Angantyr model for heavy ion collisions, where previously
only reconnections within separate nucleon sub-collisions have been allowed. We
investigate how the new impact parameter constraint influences final states in
pp collisions, and retune parameters of the multi-parton interaction parameters
in PYTHIA to compensate so that minimum bias data are reproduced. We also study
multiplicity distributions in pA collisions and find that, in order to
counteract the loss in multiplicity due to the introduction of global colour
reconnections, we need to modify some parameters in the Angantyr model while
keeping the parameters tuned to pp fixed. With Angantyr we can then extrapolate
to AA collisions without further parameter tuning and retaining a reasonable
description of the basic multiplicity distributions.
