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A new standard for the logarithmic accuracy of parton showers

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arxiv 2406.02661 v2 pith:L2ETBGMA submitted 2024-06-04 hep-ph hep-ex

classification hep-phhep-ex
keywords accuracynnllanalyticlogarithmicobservablespartonshowersaccurate
verification ladder T0 review T1 audit T2 compute T3 formal
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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.

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Forward citations

Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Factorization of the triple-collinear $q \to qc\bar{c}$ splitting function at first order in opacity

    hep-ph 2026-07 conditional novelty 7.0 of 10

    At first order in opacity, the medium-modified q->q c cbar splitting function factorizes into products of q->q g and g->c cbar splitting functions in three strongly ordered collinear limits.

  2. Timelike showers with jet recoils

    hep-ph 2025-12 conditional novelty 6.0 of 10

    A 'jet recoil' scheme assigning momentum-balance recoil to clusters of partons chosen by angular ordering brings kt-ordered dipole parton showers to next-to-leading-logarithmic accuracy, shown by fixed-order and resum...

  3. Resumming transverse observables for NNLO+PS matching in GENEVA

    hep-ph 2025-05 conditional novelty 6.0 of 10

    A GENEVA NNLO+PS generator for b bbar H and c cbar H is built with qT resummation at N3LL and the first NLL' resummation of a transverse-measure one-jettiness.

  4. Phenomenological constraints of the building blocks of the cluster hadronization model

    hep-ph 2025-05 conditional novelty 6.0 of 10

    The authors introduce matrix-element-based cluster fission and decay models and show which angularity and energy-correlation observables are most sensitive to each piece.

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