STAR task force for tuning PYTHIA

[Raghav Kunnawalkam Elayavalli <kunnawalkamraghav AT gmail.com>]

Title: CMS PYTHIA 8 colour reconnection tunes based on underlying-event data
Authors: CMS Colaboration
Categories: hep-ex hep-ph
Comments: 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)
Report-no: CMS-GEN-17-002, CERN-EP-2022-005
\\
 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.
\\ ( https://arxiv.org/abs/2205.02905 ,  1005kb)

Cheers

Raghav 

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First Name - Raghav 
Last Name - Kunnawalkam Elayavalli
email - raghav.ke AT yale.edu 
website - https://www.raghavke.me 

Associate Research Scientist  

Yale University and 

Brookhaven National Lab

<he/him/his>

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