Entanglement entropy, a prob to study hadronization

Quantum entanglement has been proved to be a powerful tool to investigate the proton substructure, as the entropy generated during high-energy scatterings can be linked to parton distribution functions. In this work, we present a novel approach that connects the entanglement entropy of hadrons within jets to their fragmentation functions. A strong agreement has been observed between the predicted entanglement entropy of jets and the hadron entropy observed in ATLAS data from high-energy collisions. This study represents the first application of a quantum entanglement entropy framework to explore the hadronization process, offering a new perspective on the transition from perturbative to non-perturbative QCD. Our results open the door to a more comprehensive understanding of hadronization and its underlying quantum nature.