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CMS PYTHIA 8 colour reconnection tunes based on underlying-event data
CMS Collaboration
CMS Collaboration
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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 13TeV, and by the CDF experiment at 1.96TeV 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 13TeV 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 13TeV.
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2023-07-10
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SpringerOpen
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Tumasyan, A., Adam, W., Andrejkovic, J.W. et al. CMS PYTHIA 8 colour reconnection tunes based on underlying-event data. Eur. Phys. J. C 83, 587 (2023). https://doi.org/10.1140/epjc/s10052-023-11630-8