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

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New parameter tunes for pythia 8 color reconnection models were developed using CMS and CDF data. These improved tunes enhance understanding of particle interactions and reduce uncertainties in top quark mass measurements.

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Area of Science:

  • High Energy Physics
  • Quantum Chromodynamics
  • Particle Physics

Background:

  • Color reconnection (CR) models in pythia 8 are crucial for simulating particle collisions.
  • Existing tunes require refinement to accurately describe experimental data.

Purpose of the Study:

  • To develop new parameter tunes for CR models in pythia 8.
  • To improve the simulation of underlying event (UE) and CR effects.
  • To reduce uncertainties in top quark mass measurements.

Main Methods:

  • Utilized measurements from CMS and CDF experiments at various center-of-mass energies (1.96, 7, 8, 13 TeV).
  • Constrained parameters of CR models and multiple-parton interactions (MPI) simultaneously.
  • Validated new tunes against UE measurements, strange-particle multiplicities, jet substructure, jet shapes, and color flow in top quark pair events.

Main Results:

  • New parameter tunes for quantum chromodynamics-inspired and gluon-move CR models were successfully obtained.
  • The new tunes show good agreement with a wide range of experimental measurements.
  • Color reconnection modeling uncertainties in top quark mass measurements were estimated.

Conclusions:

  • The developed pythia 8 CR tunes provide a more accurate description of particle collision phenomena.
  • These improved tunes are essential for precision measurements in high energy physics.
  • The study successfully quantified the impact of CR on top quark mass determination.