Physics Preliminary Summary: Measurement of the primary Lund plane density in pp collisions at $\sqrt{s} = \rm{13}$ TeV with ALICE

A measurement of the primary Lund plane density in pp collisions at ALICE is presented. The Lund plane is built for inclusive charged-particle jets in the transverse momentum range of $20 \leq p_{\rm{T,jet}}^{\rm ch} \leq 120$ GeV$/c$ using an integrated luminosity $L_{\rm{int}} \approx 22.55$ nb$^{-1}$ recorded in minimum bias data for pp collisions at $\sqrt{s} =$ 13 TeV. The projections of the Lund plane density onto the splitting scale $k_{\rm{T}}$ and splitting angle $\theta$ axis are presented and compared to various Monte Carlo calculations, highlighting the perturbative/non-perturbative and wide/narrow angle regions of the splitting phase space.