Sudakov evolution without unitarity.
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| Title: | Sudakov evolution without unitarity. |
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| Authors: | Altmann, J.1 (AUTHOR), Li, H. T.2 (AUTHOR), Scyboz, L.1 (AUTHOR) ludovic.scyboz@monash.edu, Skands, P.1 (AUTHOR) |
| Source: | European Physical Journal C -- Particles & Fields. Aug2025, Vol. 85 Issue 8, p1-20. 20p. |
| Subjects: | Particle decays, Phase space, Sampling (Process), C++, Monte Carlo method |
| Abstract: | We present a method for sampling singular functions defined on (nested) multiparticle 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 (loosely derived from Sudakov Nesting of Hard Integrals), for hadronic Z decays, and use it to test the tree-level accuracy of the Vincia sector shower through O (α s 2) . [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | We present a method for sampling singular functions defined on (nested) multiparticle 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 (loosely derived from Sudakov Nesting of Hard Integrals), for hadronic Z decays, and use it to test the tree-level accuracy of the Vincia sector shower through O (α s 2) . [ABSTRACT FROM AUTHOR] |
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| ISSN: | 14346044 |
| DOI: | 10.1140/epjc/s10052-025-14576-1 |
