Space-time picture of fragmentation in PYTHIA/JETSET for HERMES and RHIC

We examine the space-time evolution of (pre-)hadron production within the Lund string fragmentation model. The complete four-dimensional information of the string breaking vertices and the meeting points of the prehadron constituents are extracted for each single event in Monte Carlo simulations using the JETSET-part of PYTHIA. We discuss the implication on the deep inelastic lepton scattering experiments at HERMES as well as on observables in ultra-relativistic heavy ion collisions at RHIC, using PYTHIA also for modeling the hard part of the interaction. (c) 2005 Elsevier B.V. All rights reserved.