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A new way of reducing negative weights in MC@NLO

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arxiv 2310.04160 v1 pith:UDPYE4I4 submitted 2023-10-06 hep-ph

classification hep-ph
keywords borneventsnegative-weightreducingtechniqueachievesaimedbiases
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

We introduce a new technique, that we dub Born spreading, aimed at reducing the number of negative-weight $\mathbb S$ events in the MC@NLO matching of NLO calculations with parton-shower simulations. We show that such a technique, based on a re-distribution of Born matrix elements in the radiative phase space, achieves a sizeable reduction of negative-weight events at little computational cost. The method does not induce any biases in physical distributions.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Resonance-aware parton-shower matching for off-shell top-antitop production with semi-leptonic decays at electron-positron colliders

    hep-ph 2026-02 conditional novelty 7.0 of 10

    A resonance-aware MC@NLO matching procedure preserves top-antitop line shapes when NLO QCD predictions for off-shell ttbar production at e+e− colliders are showered with Pythia8.

  2. Data-parallel leading-order event generation in MadGraph5_aMC@NLO

    hep-ph 2025-07 conditional novelty 6.0 of 10

    CUDACPP gives MadGraph data-parallel helicity amplitudes, delivering linear SIMD CPU speed-ups and up to order-of-magnitude GPU speed-ups for high-multiplicity QCD event generation.

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