| Article | |
| Report number | arXiv:2406.02661 ; CERN-TH-2024-057 ; OUTP-24-03P |
| Title | New Standard for the Logarithmic Accuracy of Parton Showers |
| Author(s) | van Beekveld, Melissa (Nikhef, Amsterdam) ; Dasgupta, Mrinal (Manchester U.) ; El-Menoufi, Basem Kamal (Monash U.) ; Ferrario Ravasio, Silvia (CERN) ; Hamilton, Keith (University Coll. London) ; Helliwell, Jack (Oxford U., Theor. Phys.) ; Karlberg, Alexander (CERN) ; Monni, Pier Francesco (CERN) ; Salam, Gavin P. (Oxford U., Theor. Phys. ; U. Oxford (main)) ; Scyboz, Ludovic (Monash U.) ; Soto-Ontoso, Alba (CERN) ; Soyez, Gregory (IPhT, Saclay) |
| Publication | 2025-01-03 |
| Imprint | 2024-06-04 |
| Number of pages | 7 |
| Note | public code available as part of 0.2.0 release of PanScales, https://gitlab.com/panscales/panscales-0.X |
| In: | Phys. Rev. Lett. 134 (2025) 011901 |
| DOI | 10.1103/PhysRevLett.134.011901 (publication) |
| Subject category | hep-ex ; Particle Physics - Experiment ; hep-ph ; Particle Physics - Phenomenology |
| Abstract | 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. |
| Copyright/License | preprint: (License: CC BY 4.0) publication: © 2025 authors (License: CC BY 4.0), sponsored by SCOAP³ |
Corresponding record in: Inspire
Rekord stworzony 2024-06-07, ostatnia modyfikacja 2025-04-10
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