hadronlevel
Hadron level is a concept in high-energy particle physics describing the state of an event after the perturbative parton shower has ended and hadronization has taken place, such that the final state consists of hadrons produced by fragmentation of quarks and gluons. At this stage, color confinement has been realized, and partons have formed color-neutral hadrons. The hadron-level description typically precedes the detector response stage; analyses may compare hadron-level predictions directly to measurements that reconstruct stable hadrons, or to particle-level jets formed from those hadrons. Depending on the workflow, a hadron-level event may include stable hadrons only or stable plus short-lived resonances that are subsequently decayed in a separate step.
Hadron-level data are used to validate hadronization models and tune Monte Carlo generators such as Pythia,