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We present the first anti-k$_{T}$ jet spectrum and substructure measurementsusing the archived ALEPH $e^+e^-$ data taken in 1994 at a center of mass energyof $\sqrt{s} = 91.2$ GeV. Jets are reconstructed with the anti-k$_{T}$algorithm with a resolution parameter of 0.4. It is the cleanest test of jetsand QCD without the complication of hadronic initial states. The fixedcenter-of-mass energy also allows the first direct test of pQCD calculation. Wepresent both the inclusive jet energy spectrum and the leading dijet energyspectra, together with a number of substructure observables. They are comparedto predictions from PYTHIA6, PYTHIA8, Sherpa, HERWIG, VINCIA, and PYQUEN. Noneof the models fully reproduce the data. The data are also compared to twoperturbative QCD calculations at NLO and with NLL'+R resummation. The resultscan also serve as reference measurements to compare to results from hadroniccolliders. Future directions, including testing jet clustering algorithmsdesigned for future electron-ion collider experiments, will also be discussed.

First measurement of anti-k$_\mathrm{T}$ jet spectra and jet substructure using the archived ALEPH $e^+e^-$ data at 91.2 GeV