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CMS pythia 8 colour reconnection tunes based on underlying-event data
A Tumasyan1,2, W Adam3, J W Andrejkovic3
1Yerevan Physics Institute, Yerevan, Armenia.
The European Physical Journal. C, Particles and Fields
|July 13, 2023
Summary
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.
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.
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