HERWIG 6.4 Release Note
G. Corcella, I. G. Knowles, G. Marchesini, S. Moretti, K. Odagiri, P. Richardson, M. H. Seymour, B. R. Webber
TL;DR
HERWIG 6.4 enhances physics realism by implementing spin correlations for heavy fermions and SUSY decays, incorporating polarized lepton beams, and expanding MSSM Higgs processes in lepton collisions. It introduces a TAUOLA interface for tau decays and consolidates several bug fixes across production mechanisms and scale choices. The release thus improves accuracy for heavy flavor, SUSY, and Higgs phenomenology in both lepton and hadron collider contexts, while maintaining compatibility with prior versions.
Abstract
A new release of the Monte Carlo program HERWIG (version 6.4) is now available. The main new features are: spin correlations between the production and decay of heavy fermions, i.e. top quarks, tau leptons and SUSY particles; polarization effects in SUSY production processes in lepton-lepton collisions; an interface to TAUOLA for tau decays; MSSM Higgs processes in lepton-lepton collisions.