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Photo of Andrew Lifson

Andrew Lifson

Doctoral student

Photo of Andrew Lifson

Helicity antenna showers for hadron colliders

Author

  • Nadine Fischer
  • Andrew Lifson
  • Peter Skands

Summary, in English

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.

Publishing year

2017-10-01

Language

English

Publication/Series

European Physical Journal C

Volume

77

Issue

10

Document type

Journal article

Publisher

Springer

Status

Published

ISBN/ISSN/Other

  • ISSN: 1434-6044