Event generation with exponential scaling in multiplicity using AmpliCol
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866911402505011200 |
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| author | Frederix, Rikkert Vitos, Timea |
| author_facet | Frederix, Rikkert Vitos, Timea |
| contents | Efficient generation of LHC events is hindered by the rapidly rising cost of evaluating QCD matrix elements with increasing multiplicity. We build on a recently proposed two-step strategy in which unweighted events are first generated using the leading-colour (LC) approximation and then reweighted to full-colour (FC) accuracy, utilising the LC integration efficiency while recovering the exact FC prediction. In this work we extend the method to general Standard Model processes and present AmpliCol, a standalone implementation designed for LHC collisions. We benchmark multi-jet, $t\bar{t}$+jets, $ZZ$+jets, and Drell-Yan+jets production, measuring the time required to obtain a fixed number of unweighted events at FC accuracy. Across all processes, the runtime exhibits a stable exponential scaling with multiplicity, far milder than the factorial growth of conventional matrix-element generators. This demonstrates that the AmpliCol code enables efficient event generation at multiplicities that are otherwise computationally prohibitive. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_19483 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Event generation with exponential scaling in multiplicity using AmpliCol Frederix, Rikkert Vitos, Timea High Energy Physics - Phenomenology Efficient generation of LHC events is hindered by the rapidly rising cost of evaluating QCD matrix elements with increasing multiplicity. We build on a recently proposed two-step strategy in which unweighted events are first generated using the leading-colour (LC) approximation and then reweighted to full-colour (FC) accuracy, utilising the LC integration efficiency while recovering the exact FC prediction. In this work we extend the method to general Standard Model processes and present AmpliCol, a standalone implementation designed for LHC collisions. We benchmark multi-jet, $t\bar{t}$+jets, $ZZ$+jets, and Drell-Yan+jets production, measuring the time required to obtain a fixed number of unweighted events at FC accuracy. Across all processes, the runtime exhibits a stable exponential scaling with multiplicity, far milder than the factorial growth of conventional matrix-element generators. This demonstrates that the AmpliCol code enables efficient event generation at multiplicities that are otherwise computationally prohibitive. |
| title | Event generation with exponential scaling in multiplicity using AmpliCol |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2601.19483 |