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Precision measurements of jet substructure are used as a probe of fundamentalQCD processes. The primary Lund jet plane density is a two-dimensional visualrepresentation of the radiation off the primary emitter within the jet that canbe used to isolate different regions of the QCD phase space. A new measurementof the primary Lund plane density for inclusive charged-particle jets in thetransverse momentum range of 20 and 120 GeV/$c$ in pp collisions at $\sqrt{s} =$ 13 TeV with the ALICE detector will be presented. This is the firstmeasurement of the Lund plane density in an intermediate jet $p_{\rm T}$ rangewhere hadronization and underlying event effects play a dominant role. Theprojections of the Lund plane density onto the splitting scale $k_{\rm T}$ andsplitting angle $\Delta{R}$ axis are shown, highlighting theperturbative/non-perturbative and wide/narrow angle regions of the splittingphase space. Through a 3D unfolding procedure, the Lund plane density iscorrected for detector effects which allows for quantitative comparisons to MCgenerators to provide insight into how well generators describe differentfeatures of the parton shower and hadronization.

Measurement of the primary Lund jet plane density in pp collisions at 13 TeV with ALICE