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

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

R. Frederix
(
- Lund U., Dept. Theor. Phys.
)
,
S. Frixione
(
- INFN, Genoa
)
,
S. Prestel
(
- Lund U., Dept. Theor. Phys.
)
,
P. Torrielli
(
- U. Turin (main) and
- INFN, Turin
)

Feb 28, 2020

44 pages

Published in:

JHEP 07 (2020) 238

Published: Jul 31, 2020

e-Print:

2002.12716 [hep-ph]

DOI:

10.1007/JHEP07(2020)238

Report number:

LU-TP 20-09,
MCNET-20-08

Experiments:

MC@NLO

View in:

ADS Abstract Service

reference search43 citations

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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