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arxiv: 2406.02661 · v2 · pith:L2ETBGMAnew · submitted 2024-06-04 · ✦ hep-ph · hep-ex

A new standard for the logarithmic accuracy of parton showers

Melissa van Beekveld , Mrinal Dasgupta , Basem Kamal El-Menoufi , Silvia Ferrario Ravasio , Keith Hamilton , Jack Helliwell , Alexander Karlberg , Pier Francesco Monni
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Gavin P. Salam Ludovic Scyboz Alba Soto-Ontoso Gregory Soyez
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classification ✦ hep-ph hep-ex
keywords accuracynnllanalyticlogarithmicobservablespartonshowersaccurate
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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.

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