New sets of parameter tunes for two of the colour reconnection models, quantum chromodynamics-inspired and gluon-move, implemented in the pythia 8 event generator, are obtained based on the default CMS pythia 8 underlying-event tune, CP5. Measurements sensitive to the underlying event performed by the CMS experiment at centre-of-mass energies s√=7 and 13Te\hspace{-.08em}V, and by the CDF experiment at 1.96Te\hspace{-.08em}V are used to constrain the parameters of colour reconnection models and multiple-parton interactions simultaneously. The new colour reconnection tunes are compared with various measurements at 1.96, 7, 8, and 13Te\hspace{-.08em}V including measurements of the underlying-event, strange-particle multiplicities, jet substructure observables, jet shapes, and colour flow in top quark pair (tt¯) events. The new tunes are also used to estimate the uncertainty related to colour reconnection modelling in the top quark mass measurement using the decay products of tt¯ events in the semileptonic channel at 13Te\hspace{-.08em}V.

CMS PYTHIA 8 colour reconnection tunes based on underlying-event data

CANDELISE, V.;DA ROLD, A.;DELLA RICCA, G.;SORRENTINO, G.;
2023-01-01

Abstract

New sets of parameter tunes for two of the colour reconnection models, quantum chromodynamics-inspired and gluon-move, implemented in the pythia 8 event generator, are obtained based on the default CMS pythia 8 underlying-event tune, CP5. Measurements sensitive to the underlying event performed by the CMS experiment at centre-of-mass energies s√=7 and 13Te\hspace{-.08em}V, and by the CDF experiment at 1.96Te\hspace{-.08em}V are used to constrain the parameters of colour reconnection models and multiple-parton interactions simultaneously. The new colour reconnection tunes are compared with various measurements at 1.96, 7, 8, and 13Te\hspace{-.08em}V including measurements of the underlying-event, strange-particle multiplicities, jet substructure observables, jet shapes, and colour flow in top quark pair (tt¯) events. The new tunes are also used to estimate the uncertainty related to colour reconnection modelling in the top quark mass measurement using the decay products of tt¯ events in the semileptonic channel at 13Te\hspace{-.08em}V.
2023
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https://link.springer.com/article/10.1140/epjc/s10052-023-11630-8
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/3051238
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