Helicity antenna showers for hadron colliders

Nadine Fischer, Andrew Lifson, Peter Skands

Research output: Contribution to journalArticleResearchpeer-review

13 Citations (Scopus)


We present a complete set of helicity-dependent 2 → 3 antenna functions for QCD initial- and final-state radiation. The functions are implemented in the Vincia shower Monte Carlo framework and are used to generate showers for hadron-collider processes in which helicities are explicitly sampled (and conserved) at each step of the evolution. Although not capturing the full effects of spin correlations, the explicit helicity sampling does permit a significantly faster evaluation of fixed-order matrix-element corrections. A further speed increase is achieved via the implementation of a new fast library of analytical MHV amplitudes, while matrix elements from Madgraph are used for non-MHV configurations. A few examples of applications to QCD 2 → 2 processes are given, comparing the newly released Vincia 2.200 to Pythia 8.226.

Original languageEnglish
Article number719
Number of pages17
JournalEuropean Physical Journal C
Issue number10
Publication statusPublished - 1 Oct 2017

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