Helicity antenna showers for hadron colliders

Nadine Fischer; Andrew Lifson; Peter Skands

doi:10.1140/epjc/s10052-017-5306-7

Helicity antenna showers for hadron colliders

Nadine Fischer, Andrew Lifson, Peter Skands

Research output: Contribution to journal › Article › peer-review

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 2 → 2 processes are given, comparing the newly released Vincia 2.200 to Pythia 8.226.

Original language	English
Article number	719
Journal	European Physical Journal C
Volume	77
Issue number	10
DOIs	https://doi.org/10.1140/epjc/s10052-017-5306-7
Publication status	Published - 2017 Oct 1
Externally published	Yes

Subject classification (UKÄ)

Subatomic Physics

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10.1140/epjc/s10052-017-5306-7

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title = "Helicity antenna showers for hadron colliders",

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 2 → 2 processes are given, comparing the newly released Vincia 2.200 to Pythia 8.226.",

author = "Nadine Fischer and Andrew Lifson and Peter Skands",

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AU - Fischer, Nadine

AU - Lifson, Andrew

AU - Skands, Peter

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N2 - 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.

AB - 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.

U2 - 10.1140/epjc/s10052-017-5306-7

DO - 10.1140/epjc/s10052-017-5306-7

M3 - Article

AN - SCOPUS:85032583661

VL - 77

JO - European Physical Journal C. Particles and Fields

JF - European Physical Journal C. Particles and Fields

SN - 1434-6044

IS - 10

M1 - 719

ER -

Helicity antenna showers for hadron colliders

Abstract

Subject classification (UKÄ)

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