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Helicity antenna showers for hadron colliders

Fischer, Nadine LU ; Lifson, Andrew LU and Skands, Peter LU (2017) In European Physical Journal C 77(10).
Abstract

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... (More)

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.

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author
; and
publishing date
type
Contribution to journal
publication status
published
subject
in
European Physical Journal C
volume
77
issue
10
article number
719
publisher
Springer
external identifiers
  • scopus:85032583661
ISSN
1434-6044
DOI
10.1140/epjc/s10052-017-5306-7
language
English
LU publication?
no
id
1670fc82-8531-4534-9183-a2e961b30849
date added to LUP
2019-05-14 14:24:48
date last changed
2022-04-02 08:50:12
@article{1670fc82-8531-4534-9183-a2e961b30849,
  abstract     = {{<p>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.</p>}},
  author       = {{Fischer, Nadine and Lifson, Andrew and Skands, Peter}},
  issn         = {{1434-6044}},
  language     = {{eng}},
  month        = {{10}},
  number       = {{10}},
  publisher    = {{Springer}},
  series       = {{European Physical Journal C}},
  title        = {{Helicity antenna showers for hadron colliders}},
  url          = {{http://dx.doi.org/10.1140/epjc/s10052-017-5306-7}},
  doi          = {{10.1140/epjc/s10052-017-5306-7}},
  volume       = {{77}},
  year         = {{2017}},
}