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We present an idea of how to use a continuous extrapolation of the perturbative results of colour evolution at the amplitude level to the nonperturbative regime. Then we apply it as a guiding principle for a colour reconnection built on top of cluster hadronization model. [ABSTRACT FROM AUTHOR]

We present a new model for soft interactions in the Monte Carlo event generator Herwig. The soft diffractive final states are modelled on the basis of the cluster hadronization model and interactions between soft particles are modelled as multiple particle production with multiperipheral kinematics. We further present much improved results of mininum-bias measurements at different energies. [ABSTRACT FROM AUTHOR]

Abstract: We review the development of the physics behind event generators during the last decade. After a more general description of parton showers, we focus mostly on the perturbative side of the simulations. Two newer developments of parton showers, as implemented in herwig++, are described in greater detail. Matching and merging of parton showers with fixed order computations are discussed. We describe some developments of multiple partonic interactions which are relevant for the simulation of jets from the underlying event, where the implementation in herwig++ is again taken as a generic example. Finally, we compare some event generator results to collider data from LEP and the LHC. [Copyright &y& Elsevier]

The transverse momentum of electroweak bosons in a Drell-Yan process is an important quantity for the experimental program at the LHC. The new model of non-perturbative gluon emission in an initial state parton shower presented in this note gives a good description of this quantity for the data taken in previous experiments over a wide range of CM energy. The model's prediction for the transverse momentum distribution of Z bosons for the LHC is presented and used for a comparison with other approaches. [ABSTRACT FROM AUTHOR]

We report on progress with the new Monte Carlo event generator Herwig++. The chain of event simulation is briefly outlined and details on current developments, particularly in the framework of Herwig++ are given. [ABSTRACT FROM AUTHOR]