Leading-colour-based unweighted event generation for multi-parton tree-level processes
Abstract In this work, we revisit unweighted event generation for multi-parton tree-level processes in massless QCD. We introduce a two-step approach, in which initially unweighted events are generated at leading-colour (LC) accuracy, followed by a reweighting of these events to full-colour (FC) acc...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2024-12-01
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| Series: | Journal of High Energy Physics |
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| Online Access: | https://doi.org/10.1007/JHEP12(2024)201 |
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| author | Rikkert Frederix Timea Vitos |
| author_facet | Rikkert Frederix Timea Vitos |
| author_sort | Rikkert Frederix |
| collection | DOAJ |
| description | Abstract In this work, we revisit unweighted event generation for multi-parton tree-level processes in massless QCD. We introduce a two-step approach, in which initially unweighted events are generated at leading-colour (LC) accuracy, followed by a reweighting of these events to full-colour (FC) accuracy and applying an additional unweighting cycle. This method leverages the simple structure of LC integrands, enabling optimized phase-space parameterisations and resulting in high primary unweighting efficiencies, ranging from the percent level for 2 → 4 processes to the per-mille level for 2 → 7 processes. Given that the LC-accurate matrix elements closely approximate the FC-accurate ones, the secondary unweighting efficiencies exceed 50%. Our results suggest that this two-step approach offers an efficient alternative to direct event generation at FC accuracy. |
| format | Article |
| id | doaj-art-3c5677fdb1474c87aaf4266daafb9b4f |
| institution | Kabale University |
| issn | 1029-8479 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj-art-3c5677fdb1474c87aaf4266daafb9b4f2025-01-05T12:05:55ZengSpringerOpenJournal of High Energy Physics1029-84792024-12-0120241212810.1007/JHEP12(2024)201Leading-colour-based unweighted event generation for multi-parton tree-level processesRikkert Frederix0Timea Vitos1Department of Physics, Lund UniversityDepartment of Physics and Astronomy, Uppsala UniversityAbstract In this work, we revisit unweighted event generation for multi-parton tree-level processes in massless QCD. We introduce a two-step approach, in which initially unweighted events are generated at leading-colour (LC) accuracy, followed by a reweighting of these events to full-colour (FC) accuracy and applying an additional unweighting cycle. This method leverages the simple structure of LC integrands, enabling optimized phase-space parameterisations and resulting in high primary unweighting efficiencies, ranging from the percent level for 2 → 4 processes to the per-mille level for 2 → 7 processes. Given that the LC-accurate matrix elements closely approximate the FC-accurate ones, the secondary unweighting efficiencies exceed 50%. Our results suggest that this two-step approach offers an efficient alternative to direct event generation at FC accuracy.https://doi.org/10.1007/JHEP12(2024)201AutomationHigher-Order Perturbative Calculations |
| spellingShingle | Rikkert Frederix Timea Vitos Leading-colour-based unweighted event generation for multi-parton tree-level processes Journal of High Energy Physics Automation Higher-Order Perturbative Calculations |
| title | Leading-colour-based unweighted event generation for multi-parton tree-level processes |
| title_full | Leading-colour-based unweighted event generation for multi-parton tree-level processes |
| title_fullStr | Leading-colour-based unweighted event generation for multi-parton tree-level processes |
| title_full_unstemmed | Leading-colour-based unweighted event generation for multi-parton tree-level processes |
| title_short | Leading-colour-based unweighted event generation for multi-parton tree-level processes |
| title_sort | leading colour based unweighted event generation for multi parton tree level processes |
| topic | Automation Higher-Order Perturbative Calculations |
| url | https://doi.org/10.1007/JHEP12(2024)201 |
| work_keys_str_mv | AT rikkertfrederix leadingcolourbasedunweightedeventgenerationformultipartontreelevelprocesses AT timeavitos leadingcolourbasedunweightedeventgenerationformultipartontreelevelprocesses |