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arxiv 2505.11675 v1 pith:ETIGQI5H submitted 2025-05-16 hep-ph hep-exstat.AP

Bayesian Optimization of Pythia8 Tunes

classification hep-ph hep-exstat.AP
keywords bayesianmodeloptimizationpythia8tunedatahadronizationlepi
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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A new tune (set of model parameters) is found for the six most important parameters of the Pythia8 final state parton shower and hadronization model using Bayesian optimization. The tune fits the LEPI data from ALEPH better than the default tune in Pythia8. To the best of our knowledge, we present the most comprehensive application of Bayesian optimization to the tuning of a parton shower and hadronization model using the LEPI data.

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