Investigation of jet substructure using the archived ALEPH e+e- data at 91 GeV

We study anti-kT jets with a radius parameter of 0.4 in e⁺e⁻ collisions at √s = 91.2 GeV using archived ALEPH data from LEP. The goal is to investigate parton shower dynamics in an environment without hadronic initial state effects. As a baseline, we analyze jets from e⁺e⁻ data alongside Monte Carlo simulations, enabling comparisons between generated and reconstructed jets. Jets are groomed using different techniques: Late kT grooming, which retains the final significant splitting with the largest relative transverse momentum (kT ≈ z·pT·R); Soft Drop grooming, which removes soft wide-angle radiation based on a fixed z threshold; and Dynamic grooming, which selects the most significant splitting based on an optimized dynamic condition along the branching history. We explore correlations between grooming observables. This approach prepare us for analogous study in pp and A–A collisions, where similar techniques can probe potential medium-induced effects. Our results can be compared to state-of-the-art calculations to further understanding of the parton shower.