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PanScales parton showers for hadron collisions: formulation and fixed-order studies

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arxiv 2205.02237 v2 pith:EQTCREEX submitted 2022-05-04 hep-ph

PanScales parton showers for hadron collisions: formulation and fixed-order studies

Melissa van Beekveld , Silvia Ferrario Ravasio , Gavin P. Salam , Alba Soto-Ontoso , Gregory Soyez , Rob Verheyen This is my paper
classification hep-ph
keywords showerspanscalesacrosscollisionscolourformulationhadronparton
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We formulate PanScales parton showers for hadron collisions so as to achieve next-to-leading logarithmic (NLL) accuracy across a broad set of observables. We do so specifically for colour singlet production. Relative to the existing PanScales final-state showers, the main new question is that of how to redistribute momentum imbalances from initial-state branching across the remainder of the event. We presents tests of the showers at fixed order, including the treatment of full colour for soft-collinear emissions and of spin correlations in both the soft and collinear domains. We also include comparisons to a formulation of a standard dipole shower, the current leading-logarithmic state of the art. A forthcoming companion paper will explore all-order tests of the new showers.

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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.

  1. Logarithmically-accurate showers with massive quarks

    hep-ph 2026-05 unverdicted novelty 7.0

    PanScales final-state showers now include quark masses at NLL accuracy while keeping original accuracy for massless observables.

  2. Dissecting Parton Showers with Multi-Point Energy Correlators

    hep-ph 2026-07 accept novelty 6.0

    Projections of four-point energy correlators cleanly separate spin from kinematic azimuthal correlations inside jets; spin effects are subdominant in accessible LHC kinematics.

  3. Studying the Infrared Behaviour of Improved Logarithmic Accuracy Parton Showers with Herwig

    hep-ph 2026-05 unverdicted novelty 5.0

    Implementing improved logarithmic accuracy parton showers in Herwig reveals that differences in infrared cutoffs have important effects on hadron-level predictions and tunability.

  4. Studying the Infrared Behaviour of Improved Logarithmic Accuracy Parton Showers with Herwig

    hep-ph 2026-05 unverdicted novelty 5.0

    Implementation of two NLL-accurate dipole showers in Herwig shows that differences in infrared cutoffs produce noticeable effects at the hadron level and affect model tunability.