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October 5, 2025Open Access

Logarithmically-accurate and positive-definite NLO shower matching

Key Points

The new NLO matching scheme, ESME, is positive-definite and enhances accuracy in parton showering.
Implementing these methods within the PanScales framework yields highly competitive NLO event generation speeds.
Validation of resummation accuracy shows consistency with Drell-Yan data and standard NLO results.
This progress is pivotal for achieving logarithmic accuracy beyond NLL in processes with incoming hadrons.

Abstract

A bstract We present methods to achieve NLL+NLO accurate parton showering for processes with two coloured legs: neutral- and charged-current Drell-Yan, and Higgs production in pp collisions, as well as DIS and e + e − to jets. The methods include adaptations of existing approaches, as well as a new NLO matching scheme, ESME, that is positive-definite by construction. Our implementations of the methods within the PanScales framework yield highly competitive NLO event generation speeds. We validate the fixed-order and combined resummation accuracy with tests in the limit of small QCD coupling and briefly touch on phenomenological comparisons to standard NLO results and to Drell-Yan data. The progress reported here is an essential step towards showers with logarithmic accuracy beyond NLL for processes with incoming hadrons.

Logarithmically-accurate and positive-definite NLO shower matching

Key Points

Abstract

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