A new standard for the logarithmic accuracy of parton showers
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arXiv
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| Format: | Preprint |
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2024
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| author | van Beekveld, Melissa Dasgupta, Mrinal El-Menoufi, Basem Kamal Ravasio, Silvia Ferrario Hamilton, Keith Helliwell, Jack Karlberg, Alexander Monni, Pier Francesco Salam, Gavin P. Scyboz, Ludovic Soto-Ontoso, Alba Soyez, Gregory |
| author_facet | van Beekveld, Melissa Dasgupta, Mrinal El-Menoufi, Basem Kamal Ravasio, Silvia Ferrario Hamilton, Keith Helliwell, Jack Karlberg, Alexander Monni, Pier Francesco Salam, Gavin P. Scyboz, Ludovic Soto-Ontoso, Alba Soyez, Gregory |
| contents | We report on a major milestone in the construction of logarithmically accurate final-state parton showers, achieving next-to-next-to-leading-logarithmic (NNLL) accuracy for the wide class of observables known as event shapes. The key to this advance lies in the identification of the relation between critical NNLL analytic resummation ingredients and their parton-shower counterparts. Our analytic discussion is supplemented with numerical tests of the logarithmic accuracy of three shower variants for more than a dozen distinct event-shape observables in $Z \to q \bar q$ and Higgs $\to gg$ decays. The NNLL terms are phenomenologically sizeable, as illustrated in comparisons to data. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_02661 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A new standard for the logarithmic accuracy of parton showers van Beekveld, Melissa Dasgupta, Mrinal El-Menoufi, Basem Kamal Ravasio, Silvia Ferrario Hamilton, Keith Helliwell, Jack Karlberg, Alexander Monni, Pier Francesco Salam, Gavin P. Scyboz, Ludovic Soto-Ontoso, Alba Soyez, Gregory High Energy Physics - Phenomenology High Energy Physics - Experiment We report on a major milestone in the construction of logarithmically accurate final-state parton showers, achieving next-to-next-to-leading-logarithmic (NNLL) accuracy for the wide class of observables known as event shapes. The key to this advance lies in the identification of the relation between critical NNLL analytic resummation ingredients and their parton-shower counterparts. Our analytic discussion is supplemented with numerical tests of the logarithmic accuracy of three shower variants for more than a dozen distinct event-shape observables in $Z \to q \bar q$ and Higgs $\to gg$ decays. The NNLL terms are phenomenologically sizeable, as illustrated in comparisons to data. |
| title | A new standard for the logarithmic accuracy of parton showers |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2406.02661 |