The Vincia Parton Shower

Giele, Walter T.; Hartgring, Lisa; Kosower, David A.; Laenen, Eric; Larkoski, Andrew J.; López-Villarejo, Juan; Ritzmann, Mathias

doi:10.48550/arxiv.1307.1060

Cited by 4 publications

(4 citation statements)

References 13 publications

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“…These are described in detail in the HTML/PHP documentation. The Vincia program [105] offers a first example of a plug-in of an external (timelike) shower.…”

Section: Parton Showersmentioning

confidence: 99%

An Introduction to PYTHIA 8.2

Sjöstrand,

Ask,

Christiansen

et al. 2014

Preprint

378

502

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The Pythia program is a standard tool for the generation of events in high-energy collisions, comprising a coherent set of physics models for the evolution from a few-body hard process to a complex multiparticle final state. It contains a library of hard processes, models for initial-and final-state parton showers, matching and merging methods between hard processes and parton showers, multiparton interactions, beam remnants, string fragmentation and particle decays. It also has a set of utilities and several interfaces to external programs. Pythia 8.2 is the second main release after the complete rewrite from Fortran to C++, and now has reached such a maturity that it offers a complete replacement for most applications, notably for LHC physics studies. The many new features should allow an improved description of data.

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“…These are described in detail in the HTML/PHP documentation. The Vincia program [105] offers a first example of a plug-in of an external (timelike) shower.…”

Section: Parton Showersmentioning

confidence: 99%

An Introduction to PYTHIA 8.2

Sjöstrand,

Ask,

Christiansen

et al. 2014

Preprint

378

502

View full text Add to dashboard Cite

show abstract

“…To arrive at a full-fledged prescription, this will need to be extended to hadron collisions, ideally in a way that allows for convenient automation. A first step towards developing the underlying shower formalism for pp collisions was recently taken [73], and more work is in progress [74].…”

Section: Outlook and Conclusionmentioning

confidence: 99%

Antenna showers with one-loop matrix elements

Hartgring

Laenen

2013

J. High Energ. Phys.

102

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We consider the probability for a colour-singlet qq pair to emit a gluon, in strongly and smoothly ordered antenna showers. We expand to second order in α s and compare to the second-order QCD matrix elements for Z → 3 jets, neglecting terms suppressed by 1/N 2 C . We give a prescription that corrects the shower to the matrix-element result at this order for both soft and hard emissions, thereby explicitly reducing its dependence on evolution-and renormalization-scale choices. We confirm that the choice of p ⊥ for both of these scales absorbs all logarithms through O(α 2 s ), and contrast this with various alternatives. We include these corrections in the vincia shower generator and study the impact on LEP event-shape and fragmentation observables. An uncertainty estimate is provided for each event, in the form of a vector of alternative weights.

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“…Additional predictions are made using a set of state-of-the-art generators developed mostly for 𝑝 𝑝 collisions. Predictions from Pythia 8.3 [41,42] are used for comparison using the default implementation and two additional parton shower implementations: Vincia [43,44] and Dire [45]. The NNPDF3.1 PDF set [46] is used for both default and Vincia implementation and the MMHT14nlo68cl PDF set [47] is used for the Dire implementation.…”

Section: Monte Carlo Simulationsmentioning

confidence: 99%

Multi-differential Jet Substructure Measurement in High Q2 ep collisions with HERA-II Data

Mikuni

2024

Proceedings of the European Physical Society Conference on High Energy Physics — PoS(EPS-HEP2023)

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The radiation pattern within quark-and gluon-initiated jets (jet substructure) is used extensively as a precision probe of the strong force as well as for optimizing event generators for nearly all tasks in high energy particle and nuclear physics. A detailed study of modern jet substructure observables, jet angularities, in electron-proton collisions is presented using data recorded using the H1 detector at HERA. The measurement is unbinned and multi-dimensional, using machine learning to correct for detector effects. Training these networks was enabled by the use of a large number of GPUs in the Perlmutter supercomputer at Berkeley Lab. The particle jets are reconstructed in the laboratory frame, using the 𝑘 T jet clustering algorithm. Results are reported at high transverse momentum transfer 𝑄 2 > 150 GeV 2 , and inelasticity 0.2 < 𝑦 < 0.7. The analysis is also performed in sub-regions of 𝑄 2 , thus probing scale dependencies of the substructure variables. The data are compared with a variety of predictions and point towards possible improvements of such models.

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The Vincia Parton Shower

Cited by 4 publications

References 13 publications

An Introduction to PYTHIA 8.2

An Introduction to PYTHIA 8.2

Antenna showers with one-loop matrix elements

Multi-differential Jet Substructure Measurement in High Q2 ep collisions with HERA-II Data

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