On the reduction of negative weights in MC@NLO-type matching procedures
Feb 28, 2020
44 pages
Published in:
- JHEP 07 (2020) 238
- Published: Jul 31, 2020
e-Print:
- 2002.12716 [hep-ph]
Report number:
- LU-TP 20-09,
- MCNET-20-08
Experiments:
View in:
Citations per year
Abstract: (Springer)
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.Note:
- 44 pages, 13 figures; several minor text amendments and one figure added
- NLO Computations
- QCD Phenomenology
- parton: showers
- Monte Carlo
- PYTHIA
- higher-order: 1
- CERN LHC Coll
- collinear
References(35)
Figures(14)
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