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Jets are algorithmic proxies of hard scattered partons, i.e. quarks andgluons, in high energy particle collisions. The STAR collaboration presents thefirst measurements of substructure observables at the first, second and thirdsplits in the jet clustering tree via the iterative SoftDrop procedure. Foreach of these splits, we measure the fully corrected groomed shared momentumfraction (\zg) and groomed jet radius (\rg). We discuss the evolution of jetsubstructure in both the angular and momentum scales which allows for aself-similarity test of the DGLAP splitting function. We compare the fullycorrected data to Monte Carlo models, providing stringent constraints on modelparameters related to the parton shower and non-perturbative effects such ashadronization.

Measurement of splittings along a jet shower in $\sqrt{s} = 200$ GeV pp collisions at STAR