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

et al.
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$$\sqrt{s}=7$$ and 13TeV$$\,\text {Te\hspace{-.08em}V}$$, and by the CDF experiment at 1.96TeV$$\,\text {Te\hspace{-.08em}V}$$ 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 13TeV$$\,\text {Te\hspace{-.08em}V}$$ including measurements of the underlying-event, strange-particle multiplicities, jet substructure observables, jet shapes, and colour flow in top quark pair (tt¯$${{\text {t}} {}{\bar{\text {t}}}}$$) 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 tt¯$${{\text {t}} {}{\bar{\text {t}}}}$$ events in the semileptonic channel at 13TeV$$\,\text {Te\hspace{-.08em}V}$$.

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