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We present a Monte Carlo approach to soft-gluon resummation at subleadingcolor which can be used to improve existing parton shower algorithms. At thesingle-emission level, soft-collinear enhancements of the splitting functionsare explicitly linked to quadratic Casimir operators, while wide anglesingle-soft enhancements are connected to nontrivial color correlators. Wefocus on a numerically stable implementation of color matrix elementcorrections to all orders and approximate the virtual corrections by requiringunitarity at the single-emission level. We provide a proof-of-conceptimplementation to compute nonglobal event shapes at lepton colliders.

Numerical resummation at subleading color in the strongly ordered soft gluon limit