PoS - Proceedings of Science
Volume 390 - 40th International Conference on High Energy physics (ICHEP2020) - Parallel: Strong Interactions and Hadron Physics
Monte Carlo Modeling and Tuning in CMS
G. Van Onsem* on behalf of the CMS collaboration
*corresponding author
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Pre-published on: February 13, 2021
Published on:
The underlying event in a proton-proton collision consists of multiple-parton interactions and beam remnants, which typically involve low energy scales. The modeling of these aspects of a collision is not always calculable in perturbative quantum chromodynamics, and is governed by phenomenological parameters that need to be "tuned" to observed data. The results of such an underlying-event tuning performed by the CMS experiment for the Pythia 8 and Herwig 7 generators are presented. Various assumptions in the proton parton distribution functions and parton shower development are tested. The derived tunes are validated using data of a wide range of physics processes, and provide a good description of CMS data at a center-of-mass energy $\sqrt{s} = 13$ TeV.
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