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We present an algorithm for massive parton evolution which is based on thedifferentially accurate simulation of soft-gluon radiation by means of anon-trivial azimuthal angle dependence of the splitting functions. Thekinematics mapping is chosen such as to to reflect the symmetry of the finalstate in soft-gluon radiation and collinear splitting processes. We compute thecounterterms needed for a fully differential NLO matching and discuss theanalytic structure of the parton shower in the NLL limit. We implement the newalgorithm in the numerical code Alaric and present a first comparison toexperimental data.

A new approach to QCD evolution in processes with massive partons