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

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 $\sqrt{s}$ = 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 TeV including measurements of the underlying-event, strange-particle multiplicities, jet substructure observables, jet shapes, and colour flow in top quark pair ($\mathrm{t}\bar{\mathrm{t}}$) 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 $\mathrm{t}\bar{\mathrm{t}}$ events in the semileptonic channel at 13 TeV.

Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/GEN-17-002 (CMS Public Pages)

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Cited by in corpus (11)

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• Search for heavy pseudoscalar and scalar bosons decaying to a top quark pair in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Review of top quark mass measurements in CMS
• Soft QCD Physics at the LHC: highlights and opportunities
• Measurement of event shapes in minimum-bias events from proton-proton collisions at $\sqrt{s}$ = 13 TeV
• System size and event shape dependence of particle-identified balance functions in proton-proton collisions at $\sqrt{s}=13$ TeV using PYTHIA 8 and EPOS models
• Experimental Impact of Jet Fragmentation Reference Frames At Particle Colliders
• Two-particle number and transverse momentum balance function with event topology in pp collisions at $\sqrt{s}=13$ TeV
• Impact of soft QCD effects over intrajet azimuthal anisotropies