On the reduction of negative weights in MC@NLO-type matching procedures
(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)
- author
- Frederix, R. LU ; Frixione, S. ; Prestel, S. LU and Torrielli, P.
- organization
- publishing date
- 2020
- 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}}, }