CMS Collaboration2024-05-032024-05-032023CMS Collaboration. (2023). CMS pythia  8 colour reconnection tunes based on underlying-event data. The European Physical Journal C, 83(7), 587. https://doi.org/10.1140/epjc/s10052-023-11630-8https://hdl.handle.net/1911/115584New 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 $$\sqrt{s}=7$$and 13$$\,\text {Te\hspace{-.08em}V}$$, and by the CDF experiment at 1.96$$\,\text {Te\hspace{-.08em}V}$$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 13$$\,\text {Te\hspace{-.08em}V}$$including measurements of the underlying-event, strange-particle multiplicities, jet substructure observables, jet shapes, and colour flow in top quark pair ($${{\text {t}} {}{\bar{\text {t}}}}$$) 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 $${{\text {t}} {}{\bar{\text {t}}}}$$events in the semileptonic channel at 13$$\,\text {Te\hspace{-.08em}V}$$.engExcept where otherwise noted, this work is licensed under a Creative Commons Attribution (CC BY) license. Permission to reuse, publish, or reproduce the work beyond the terms of the license or beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.Journal articles10052-023-11630-8https://doi.org/10.1140/epjc/s10052-023-11630-8