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arXiv · 2604.13978

Resonance- and Width-aware Parton Shower Evolution and NLO Matching

Stefan Höche·Daniel Reichelt
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Abstract

We introduce a technique for the next-to-leading order accurate simulation of $e^+e^-\to W^+W^-b\bar{b}$ that respects the resonant nature of the process above and near the top-quark pair production threshold. The parton-shower evolution, infrared subtraction and NLO matching account in particular for finite width effects beyond the Breit-Wigner structure considered in resonance-aware approaches. We present first phenomenological results relevant to a potential future electron-positron collider and provide a publicly available simulator based on the ALARIC parton shower and the SHERPA event generator.

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Stefan Höche, Daniel Reichelt. 2026-04-15. Resonance- and Width-aware Parton Shower Evolution and NLO Matching. https://arxiv.org/abs/2604.13978

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