Post-hoc reweighting of hadron production in the Lund string model
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arXiv
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| Autori principali: | , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866917029916704768 |
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| author | Assi, Benoît Bierlich, Christan Ilten, Philip Menzo, Tony Mrenna, Stephen Szewc, Manuel Wilkinson, Michael K. Youssef, Ahmed Zupan, Jure |
| author_facet | Assi, Benoît Bierlich, Christan Ilten, Philip Menzo, Tony Mrenna, Stephen Szewc, Manuel Wilkinson, Michael K. Youssef, Ahmed Zupan, Jure |
| contents | We present a method for reweighting flavor selection in the Lund string fragmentation model. This is the process of calculating and applying event weights enabling fast and exact variation of hadronization parameters on pre-generated event samples. The procedure is post hoc, requiring only a small amount of additional information stored per event, and allowing for efficient estimation of hadronization uncertainties without repeated simulation. Weight expressions are derived from the hadronization algorithm itself, and validated against direct simulation for a wide range of observables and parameter shifts. The hadronization algorithm can be viewed as a hierarchical Markov process with stochastic rejections, a structure common to many complex simulations outside of high-energy physics. This perspective makes the method modular, extensible, and potentially transferable to other domains. We demonstrate the approach in Pythia, including both numerical stability and timing benefits. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_00142 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Post-hoc reweighting of hadron production in the Lund string model Assi, Benoît Bierlich, Christan Ilten, Philip Menzo, Tony Mrenna, Stephen Szewc, Manuel Wilkinson, Michael K. Youssef, Ahmed Zupan, Jure High Energy Physics - Phenomenology We present a method for reweighting flavor selection in the Lund string fragmentation model. This is the process of calculating and applying event weights enabling fast and exact variation of hadronization parameters on pre-generated event samples. The procedure is post hoc, requiring only a small amount of additional information stored per event, and allowing for efficient estimation of hadronization uncertainties without repeated simulation. Weight expressions are derived from the hadronization algorithm itself, and validated against direct simulation for a wide range of observables and parameter shifts. The hadronization algorithm can be viewed as a hierarchical Markov process with stochastic rejections, a structure common to many complex simulations outside of high-energy physics. This perspective makes the method modular, extensible, and potentially transferable to other domains. We demonstrate the approach in Pythia, including both numerical stability and timing benefits. |
| title | Post-hoc reweighting of hadron production in the Lund string model |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2505.00142 |