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A partitioned dipole-antenna shower with improved transverse recoil
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The implementation of a new final-state parton-shower algorithm in the Pythia event generator is described. The shower algorithm, dubbed Apollo, combines central aspects of the Vincia antenna shower with the global transverse-recoil scheme of the Alaric framework in order to achieve formal consistency with next-to-leading logarithmic (NLL) resummation. The shower algorithm is constructed in such a way that it facilitates a straightforward combination with fixed-order calculations. As an explicit proof of concept, a general scheme for matrix-element corrections (MECs) and two separate multiplicative next-to-leading order (NLO) matching schemes are outlined. It is argued that both matching schemes retain the logarithmic accuracy of the shower. The improved modelling of radiation is examined by contrasting the new algorithm with existing leading-logarithmic parton showers in Pythia.
Forward citations
Cited by 7 Pith papers
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Factorization of the triple-collinear $q \to qc\bar{c}$ splitting function at first order in opacity
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.
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Resonance-aware parton-shower matching for off-shell top-antitop production with semi-leptonic decays at electron-positron colliders
A resonance-aware MC@NLO matching procedure preserves top-antitop line shapes when NLO QCD predictions for off-shell ttbar production at e+e− colliders are showered with Pythia8.
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Sudakov evolution without unitarity
Sunshine removes Sudakov factors from parton-shower sampling by keeping every intermediate state, giving direct tree-level expansions and enabling tests of matrix-element corrections.
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Timelike showers with jet recoils
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...
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Recoil-Safe Subtraction, Matching and Merging in e+e- to hadrons
The Alaric shower is matched to NLO matrix elements and merged to five jets in e+e- to hadrons, with new analytic subtraction terms validated against Catani-Seymour subtraction.
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Parton spin correlations and $\mathcal{CP}$ properties in Higgs boson decay at future lepton colliders
In H→gg at a 240 GeV e+e− collider, the four-point energy-energy correlator with energy weight n=4 gives the strongest sensitivity to gluon spin correlations and, assuming perfect splitting-mode identification in the ...
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The PYTHIA Facility
PYTHIA is presented as a 'big science facility' in software form: since 2018 its manuals drew ~9,600 citing works and ~47,000 unique authors across LHC, heavy-ion, flavor, astroparticle, and ML-for-physics communities.
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