Sudakov evolution without unitarity
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arXiv
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| Hauptverfasser: | , , , |
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| Format: | Preprint |
| Veröffentlicht: |
2025
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| _version_ | 1866918121965617152 |
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| author | Altmann, Javira Li, Hai Tao Scyboz, Ludovic Skands, Peter |
| author_facet | Altmann, Javira Li, Hai Tao Scyboz, Ludovic Skands, Peter |
| contents | We present a method for sampling singular functions defined on (nested) multi-particle phase spaces, based on a generalisation of parton-shower phase-space generation techniques. At the heart of the method are three key ingredients: 1) the Sudakov sampling by which shower-style calculations sweep across phase space in an ordered manner, from hard to soft; 2) the sequential nesting of multiparticle phase spaces; and 3) the factorisations obeyed by singular multiparton amplitudes on the edges of these phase spaces. We demonstrate a C++ implementation of the proposed algorithm, dubbed Sunshine, for hadronic Z decays, and use it to test the tree-level accuracy of the Vincia sector shower through $\mathcal{O}(α_s^2)$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_00111 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Sudakov evolution without unitarity Altmann, Javira Li, Hai Tao Scyboz, Ludovic Skands, Peter High Energy Physics - Phenomenology We present a method for sampling singular functions defined on (nested) multi-particle phase spaces, based on a generalisation of parton-shower phase-space generation techniques. At the heart of the method are three key ingredients: 1) the Sudakov sampling by which shower-style calculations sweep across phase space in an ordered manner, from hard to soft; 2) the sequential nesting of multiparticle phase spaces; and 3) the factorisations obeyed by singular multiparton amplitudes on the edges of these phase spaces. We demonstrate a C++ implementation of the proposed algorithm, dubbed Sunshine, for hadronic Z decays, and use it to test the tree-level accuracy of the Vincia sector shower through $\mathcal{O}(α_s^2)$. |
| title | Sudakov evolution without unitarity |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2507.00111 |