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

CMS Collaboration

Preprint

PUBDB-2022-04480

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

CMS Collaboration (Collaboration author)DESY*

2022

[10.3204/PUBDB-2022-04480]

This record in other databases:

Please use a persistent id in citations: doi:10.3204/PUBDB-2022-04480

Report No.: CERN-EP-2022-005; CMS-GEN-17-002; arXiv:2205.02905

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, hadron ratios (from e$^+$e$^-$ colliders), jet shapes, and colour flow in top quark pair ($\mathrm{t\bar{t}}$) 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 $\mathrm{t\bar{t}}$ events in the semileptonic channel at 13 TeV.

Keyword(s): p p: scattering ; p p: colliding beams ; anti-p p: scattering ; anti-p p: colliding beams ; top: pair production ; top: mass ; color: 2 ; color: flow ; strange particle: multiplicity ; underlying event ; shape analysis ; PYTHIA ; CMS ; hadron: yield ; yield: ratio ; CDF ; numerical calculations: Monte Carlo ; structure ; 1960 GeV-cms ; 7000 GeV-cms ; 8000 GeV-cms ; 13000 GeV-cms

Note: Submitted to the European Physical Journal C. All figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/GEN-17-002 (CMS Public Pages). [This version corrects the metadata.]

Contributing Institute(s):