Automating scattering amplitudes with chirality flow
(2022) In European Physical Journal C 82(6).- Abstract
Recently we introduced the chirality-flow formalism, a method which builds on the spinor-helicity formalism and is inspired by the color-flow idea in QCD. With this formalism, Feynman rules and diagrams are simplified to the extent that it is often possible to immediately, by hand, write down a helicity amplitude given a Feynman diagram. In this paper we show that the method can also speed up numerical evaluation of scattering amplitudes by considering e+e- going to n photons in a MadGraph-based tree-level implementation. We find that the computation time is reduced by roughly a factor ten for six photons, and that it scales better with the number of external particles than the default MadGraph5_aMC@NLO... (More)
Recently we introduced the chirality-flow formalism, a method which builds on the spinor-helicity formalism and is inspired by the color-flow idea in QCD. With this formalism, Feynman rules and diagrams are simplified to the extent that it is often possible to immediately, by hand, write down a helicity amplitude given a Feynman diagram. In this paper we show that the method can also speed up numerical evaluation of scattering amplitudes by considering e+e- going to n photons in a MadGraph-based tree-level implementation. We find that the computation time is reduced by roughly a factor ten for six photons, and that it scales better with the number of external particles than the default MadGraph5_aMC@NLO implementation. This performance gain is in part attributed to the more compact Lorentz structures involved, and in part due to a transparent choice of gauge reference vectors which reduces the number of Feynman diagrams considered.
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- author
- Lifson, Andrew LU ; Sjödahl, Malin LU and Wettersten, Zenny
- organization
- publishing date
- 2022-06
- type
- Contribution to journal
- publication status
- published
- subject
- in
- European Physical Journal C
- volume
- 82
- issue
- 6
- article number
- 535
- publisher
- Springer
- external identifiers
-
- scopus:85132102945
- ISSN
- 1434-6044
- DOI
- 10.1140/epjc/s10052-022-10455-1
- project
- The Chirality-Flow Formalism and Optimising Scattering Amplitudes
- language
- English
- LU publication?
- yes
- id
- 58d9a4e0-86ab-4a6f-8180-61c0f736fa2f
- date added to LUP
- 2022-09-05 08:40:38
- date last changed
- 2024-04-18 13:33:04
@article{58d9a4e0-86ab-4a6f-8180-61c0f736fa2f,
abstract = {{<p>Recently we introduced the chirality-flow formalism, a method which builds on the spinor-helicity formalism and is inspired by the color-flow idea in QCD. With this formalism, Feynman rules and diagrams are simplified to the extent that it is often possible to immediately, by hand, write down a helicity amplitude given a Feynman diagram. In this paper we show that the method can also speed up numerical evaluation of scattering amplitudes by considering e<sup>+</sup>e<sup>-</sup> going to n photons in a MadGraph-based tree-level implementation. We find that the computation time is reduced by roughly a factor ten for six photons, and that it scales better with the number of external particles than the default MadGraph5_aMC@NLO implementation. This performance gain is in part attributed to the more compact Lorentz structures involved, and in part due to a transparent choice of gauge reference vectors which reduces the number of Feynman diagrams considered.</p>}},
author = {{Lifson, Andrew and Sjödahl, Malin and Wettersten, Zenny}},
issn = {{1434-6044}},
language = {{eng}},
number = {{6}},
publisher = {{Springer}},
series = {{European Physical Journal C}},
title = {{Automating scattering amplitudes with chirality flow}},
url = {{http://dx.doi.org/10.1140/epjc/s10052-022-10455-1}},
doi = {{10.1140/epjc/s10052-022-10455-1}},
volume = {{82}},
year = {{2022}},
}