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Matrix element corrections in top quark decays for the tt¯W± process

Frederix, Rikkert LU orcid ; Gellersen, Leif LU and Nasufi, Jasmina LU (2024) In European Physical Journal C 84(4).
Abstract

We present a method that allows enabling matrix element corrections (MECs) in Pythia8 with MC@NLO matching, without incurring double counting. MECs are an interesting feature that may contribute to the accuracy of theoretical predictions, alongside matching and merging. We directly compare our method to a specific choice of settings in Pythia8, which can remove double-counting for MECs in certain processes. We show results by taking the tt¯W process as an example. This choice allows us to study the impact of decay MECs in the 2SSℓ and 3ℓ final states. We find that jet-related observables receive these corrections unevenly throughout the phase space. They can contribute up to ±6% in certain regions.

Please use this url to cite or link to this publication:
author
; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
European Physical Journal C
volume
84
issue
4
article number
410
publisher
Springer
external identifiers
  • scopus:85191030161
ISSN
1434-6044
DOI
10.1140/epjc/s10052-024-12737-2
language
English
LU publication?
yes
id
9ff5171f-2779-487e-a692-1d32f7056997
date added to LUP
2024-05-06 13:50:12
date last changed
2024-05-06 13:51:31
@article{9ff5171f-2779-487e-a692-1d32f7056997,
  abstract     = {{<p>We present a method that allows enabling matrix element corrections (MECs) in Pythia8 with MC@NLO matching, without incurring double counting. MECs are an interesting feature that may contribute to the accuracy of theoretical predictions, alongside matching and merging. We directly compare our method to a specific choice of settings in Pythia8, which can remove double-counting for MECs in certain processes. We show results by taking the tt¯W process as an example. This choice allows us to study the impact of decay MECs in the 2SSℓ and 3ℓ final states. We find that jet-related observables receive these corrections unevenly throughout the phase space. They can contribute up to ±6% in certain regions.</p>}},
  author       = {{Frederix, Rikkert and Gellersen, Leif and Nasufi, Jasmina}},
  issn         = {{1434-6044}},
  language     = {{eng}},
  number       = {{4}},
  publisher    = {{Springer}},
  series       = {{European Physical Journal C}},
  title        = {{Matrix element corrections in top quark decays for the tt¯W± process}},
  url          = {{http://dx.doi.org/10.1140/epjc/s10052-024-12737-2}},
  doi          = {{10.1140/epjc/s10052-024-12737-2}},
  volume       = {{84}},
  year         = {{2024}},
}