MC@NLO event generation by reweighting unweighted Born events
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arXiv
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| Autores principales: | , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| _version_ | 1866918347530043392 |
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| author | Farkh, Saad El Frederix, Rikkert Gouighri, Mohamed |
| author_facet | Farkh, Saad El Frederix, Rikkert Gouighri, Mohamed |
| contents | We propose a computational strategy for NLO+PS simulations in the MC@NLO framework that starts from Born-accurate (LO) events and reweights them to the full MC@NLO S-event weight, while generating H-events separately. We validate the approach on two representative LHC processes and compare to direct NLO event generation for both standard MC@NLO and MC@NLO-Delta matching. Employing large folding values in the radiative variables stabilizes the S-event integral, reduces weight variance, and significantly lowers the fraction of negative weights compared to S-event generation without folding. At fixed precision, this pipeline has comparable wall-clock times relative to standard S-event generation and unweighting, with room for further optimisation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_18124 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | MC@NLO event generation by reweighting unweighted Born events Farkh, Saad El Frederix, Rikkert Gouighri, Mohamed High Energy Physics - Phenomenology We propose a computational strategy for NLO+PS simulations in the MC@NLO framework that starts from Born-accurate (LO) events and reweights them to the full MC@NLO S-event weight, while generating H-events separately. We validate the approach on two representative LHC processes and compare to direct NLO event generation for both standard MC@NLO and MC@NLO-Delta matching. Employing large folding values in the radiative variables stabilizes the S-event integral, reduces weight variance, and significantly lowers the fraction of negative weights compared to S-event generation without folding. At fixed precision, this pipeline has comparable wall-clock times relative to standard S-event generation and unweighting, with room for further optimisation. |
| title | MC@NLO event generation by reweighting unweighted Born events |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2602.18124 |