Colour reconnections in Herwig++
  We describe the implementation details of the colour reconnection model in the event generator Herwig++. We study the impact on final-state observables in detail and confirm the model idea from colour preconfinement on the basis of studies within the cluster hadronization model. Moreover, we show that the description of minimum bias and underlying event data at the LHC is improved with this model and present results of a tune to available data. 
Stefan Gieseke, Christian R\"ohr and Andrzej Si\'odmok
hep-ph