Improving colour computations in MadGraph5_aMC@NLO and exploring a 1 / Nc expansion
(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.
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/9599e047-09ae-4a0f-8d65-0da5cf4bc310
- author
- Lifson, Andrew LU and Mattelaer, Olivier
- organization
- publishing date
- 2022-12
- 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}}, }