New Submission Jet Axis Decorrelation Studies Using the ALEPH Detector at LEP

The Large Electron-Positron Collider (LEP), which operated from 1989 to 2000 at CERN, provided a clean experimental environment for studying fundamental particle interactions. In this study, we revisit data collected by the ALEPH detector during LEP's first operational phase (1992–1995), at a center-of-mass energy of 91.2 GeV, using modern jet reconstruction techniques. Specifically, we apply the anti-kT algorithm to investigate the behavior of jet axes—such as the standard energy-weighted axis (E scheme), the Winner-Take-All (WTA) axis, and the soft drop groomed axis. These jet axis observables are sensitive to the internal structure of jets and their correlations, making them valuable tools for understanding the dynamics of parton showering and hadronization. By comparing results from LEP data to simulations from modern event generators like PYTHIA, we aim to test and refine our theoretical models in a well-controlled environment. Importantly, this study provides a crucial baseline for similar measurements in more complex systems, such as proton-proton and heavy-ion collisions at the LHC and RHIC. Understanding jet axis decorrelation in a clean setting like LEP helps disentangle medium-induced effects in nuclear environments, thus contributing to the broader goals of nuclear physics.