Compact Muon Solenoid
LHC, CERN
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| CMS-PAS-GEN-19-001 | ||
| Extraction and validation of a set of HERWIG 7 tunes from CMS underlying-event measurements | ||
| CMS Collaboration | ||
| May 2020 | ||
| Abstract: This note presents a new set of parameters ("tunes") for the underlying-event model of the HERWIG 7 event generator. The parameters control the description of multiple-parton interactions (MPI) and colour reconnection in HERWIG 7, and are obtained from a fit to underlying-event and minimum-bias data collected by the CMS experiment at $\sqrt{s}=$ 0.9, 7, and 13 TeV. The tunes are based on the NNPDF3.13.1 next-to-next-to-leading-order PDF set for the parton shower, and either a leading-order or next-to-next-to-leading-order PDF set for the simulation of MPI and the beam remnants. Predictions utilizing the tunes are produced for event-shape observables, and minimum-bias, dijet, top quark pair, and weak boson events, and are compared to data. Each of the new tunes describe the data to a reasonable level, and the tunes using a leading-order PDF for the simulation of MPI are found to provide the best description of the data. | ||
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Links:
CDS record (PDF) ;
inSPIRE record ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, EPJC 81 (2021) 312. The superseded preliminary plots can be found here. |
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Compact Muon Solenoid LHC, CERN |
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