CMS pythia 8 colour reconnection tunes based on underlying-event data
(2023) European Physical Journal C — Vol. 83 (2023)
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- 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 $\sqrt{s}=7$ 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$\,\text {Te\hspace{-.08em}V}$.
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Benecke, A., Bethani, A., Bruno, G., Bury, F., Caputo, C., David, P., Delaere, C., Donertas, I. S., Giammanco, A., Jaffel, K., Jain, S., Jain, S., Lemaitre, V., Mondal, K., Prisciandaro, J., Taliercio, A., Teklishyn, M., Tran, T. T., Vischia, P., et al. (2023). CMS pythia 8 colour reconnection tunes based on underlying-event data. European Physical Journal C, 83. https://doi.org/10.1140/epjc/s10052-023-11630-8 (Original work published 2023)