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Improving colour computations in MadGraph5_aMC@NLO and exploring a 1 / Nc expansion

Lifson, Andrew LU and Mattelaer, Olivier (2022) In European Physical Journal C 82(12).
Abstract

In this paper, we present an extension of MadGraph5_aMC@NLO which is able to evaluate tree-level QCD matrix-elements up to 2 → 6 (one more particle than before). To achieve this, we implemented Berends–Giele-like recursion, and re-implemented the way colour is computed such that we can now expand the colour matrix in powers of 1 / Nc and truncate this expansion to a chosen order. For high multiplicity samples, even without truncating the colour matrix, the new implementation offers a speed gain compared to the previous MadGraph5_aMC@NLO code.

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author
and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
European Physical Journal C
volume
82
issue
12
article number
1144
publisher
Springer
external identifiers
  • scopus:85144301721
ISSN
1434-6044
DOI
10.1140/epjc/s10052-022-11078-2
project
The Chirality-Flow Formalism and Optimising Scattering Amplitudes
language
English
LU publication?
yes
id
9599e047-09ae-4a0f-8d65-0da5cf4bc310
date added to LUP
2023-01-10 15:09:53
date last changed
2024-04-18 10:02:23
@article{9599e047-09ae-4a0f-8d65-0da5cf4bc310,
  abstract     = {{<p>In this paper, we present an extension of MadGraph5_aMC@NLO which is able to evaluate tree-level QCD matrix-elements up to 2 → 6 (one more particle than before). To achieve this, we implemented Berends–Giele-like recursion, and re-implemented the way colour is computed such that we can now expand the colour matrix in powers of 1 / N<sub>c</sub> and truncate this expansion to a chosen order. For high multiplicity samples, even without truncating the colour matrix, the new implementation offers a speed gain compared to the previous MadGraph5_aMC@NLO code.</p>}},
  author       = {{Lifson, Andrew and Mattelaer, Olivier}},
  issn         = {{1434-6044}},
  language     = {{eng}},
  number       = {{12}},
  publisher    = {{Springer}},
  series       = {{European Physical Journal C}},
  title        = {{Improving colour computations in MadGraph5_aMC@NLO and exploring a 1 / N<sub>c</sub> expansion}},
  url          = {{http://dx.doi.org/10.1140/epjc/s10052-022-11078-2}},
  doi          = {{10.1140/epjc/s10052-022-11078-2}},
  volume       = {{82}},
  year         = {{2022}},
}