Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

On the reduction of negative weights in MC@NLO-type matching procedures

Frederix, R. LU orcid ; Frixione, S. ; Prestel, S. LU and Torrielli, P. (2020) In Journal of High Energy Physics 2020(7).
Abstract

We show how a careful analysis of the behaviour of a parton shower Monte Carlo in the vicinity of the soft and collinear regions allows one to formulate a modified MC@NLO-matching prescription that reduces the number of negative-weight events with respect to that stemming from the standard MC@NLO procedure. As a first practical application of such a prescription, that we dub MC@NLO-∆, we have implemented it in the MadGraph5_aMC@NLO framework, by employing the Pythia8 Monte Carlo. We present selected MC@NLO-∆ results at the 13 TeV LHC, and compare them with MC@NLO ones. We find that the former predictions are consistent with the latter ones within the typical matching systematics, and that the reduction of negative-weight events is... (More)

We show how a careful analysis of the behaviour of a parton shower Monte Carlo in the vicinity of the soft and collinear regions allows one to formulate a modified MC@NLO-matching prescription that reduces the number of negative-weight events with respect to that stemming from the standard MC@NLO procedure. As a first practical application of such a prescription, that we dub MC@NLO-∆, we have implemented it in the MadGraph5_aMC@NLO framework, by employing the Pythia8 Monte Carlo. We present selected MC@NLO-∆ results at the 13 TeV LHC, and compare them with MC@NLO ones. We find that the former predictions are consistent with the latter ones within the typical matching systematics, and that the reduction of negative-weight events is significant.

(Less)
Please use this url to cite or link to this publication:
author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
NLO Computations, QCD Phenomenology
in
Journal of High Energy Physics
volume
2020
issue
7
article number
238
publisher
Springer
external identifiers
  • scopus:85088978970
ISSN
1126-6708
DOI
10.1007/JHEP07(2020)238
language
English
LU publication?
yes
id
06e6ea75-cd0e-49ca-9c19-e9ed90e4f092
date added to LUP
2020-08-13 11:25:52
date last changed
2024-04-17 14:10:04
@article{06e6ea75-cd0e-49ca-9c19-e9ed90e4f092,
  abstract     = {{<p>We show how a careful analysis of the behaviour of a parton shower Monte Carlo in the vicinity of the soft and collinear regions allows one to formulate a modified MC@NLO-matching prescription that reduces the number of negative-weight events with respect to that stemming from the standard MC@NLO procedure. As a first practical application of such a prescription, that we dub MC@NLO-∆, we have implemented it in the MadGraph5_aMC@NLO framework, by employing the Pythia8 Monte Carlo. We present selected MC@NLO-∆ results at the 13 TeV LHC, and compare them with MC@NLO ones. We find that the former predictions are consistent with the latter ones within the typical matching systematics, and that the reduction of negative-weight events is significant.</p>}},
  author       = {{Frederix, R. and Frixione, S. and Prestel, S. and Torrielli, P.}},
  issn         = {{1126-6708}},
  keywords     = {{NLO Computations; QCD Phenomenology}},
  language     = {{eng}},
  number       = {{7}},
  publisher    = {{Springer}},
  series       = {{Journal of High Energy Physics}},
  title        = {{On the reduction of negative weights in MC@NLO-type matching procedures}},
  url          = {{http://dx.doi.org/10.1007/JHEP07(2020)238}},
  doi          = {{10.1007/JHEP07(2020)238}},
  volume       = {{2020}},
  year         = {{2020}},
}