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

Abstract: Newsets 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 13 TeV, and by the CDF experiment at 1.96 TeV 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 13 TeVincluding measurements of the underlying-event, strange-particle multiplicities, jet substructure observables, jet shapes, and colour flow in top quark pair (t¯t) 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 t¯t events in the semileptonic channel at 13 TeV.

 Fuente: European Physical Journal C, 2023, 83(7), 587

 Publisher: Springer New York LLC

 Publication date: 01/07/2023

 No. of pages: 48

 Publication type: Article

 DOI: 10.1140/epjc/s10052-023-11630-8

 ISSN: 1434-6044,1434-6052

 Publication Url: