VINCIA for hadron colliders

N. Fischer, S. Prestel, M. Ritzmann, P. Skands

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Abstract

We present the first public implementation of antenna-based QCD initial- and final-state showers. The shower kernels are 2 → 3 antenna functions, which capture not only the collinear dynamics but also the leading soft (coherent) singularities of QCD matrix elements. We define the evolution measure to be inversely proportional to the leading poles, hence gluon emissions are evolved in a pmeasure inversely proportional to the eikonal, while processes that only contain a single pole (e.g., g→ qq¯) are evolved in virtuality. Non-ordered emissions are allowed, suppressed by an additional power of 1 / Q2. Recoils and kinematics are governed by exact on-shell 2 → 3 phase-space factorisations. This first implementation is limited to massless QCD partons and colourless resonances. Tree-level matrix-element corrections are included for QCD up to O(αs4) (4 jets), and for Drell–Yan and Higgs production up to O(αs3) (V / H + 3 jets). The resulting algorithm has been made publicly available in Vincia 2.0.

Original languageEnglish
Article number589
Number of pages47
JournalEuropean Physical Journal C
Volume76
Issue number11
DOIs
Publication statusPublished - 1 Nov 2016
  • The VINCIA antenna shower for hadron colliders

    Skands, P., Fischer, N., Prestel, S. & Ritzmann, M., 2016, 38th International Conference on High Energy Physics, ICHEP 2016: Chicago; United States; 3 August 2016 through 10 August 2016; Code 128556. Proceedings of Science, Vol. Part F128556. 6 p. 596

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