Groomed jet substructure measurements of charm jets tagged with $\rm{D}^{0}$ mesons in pp collisions at $\sqrt{s}$ = 13 TeV

The ALICE collaboration at the CERN LHC reports the first measurements of groomed jet substructure observables for jets containing a fully reconstructed $\rm{D}^{0}$ in pp collisions at $\sqrt{s}$ = 13 TeV. Iterative declustering techniques access the jet splitting tree of track-based jets, with grooming techniques isolating the perturbative branches. Fully reconstructed $\rm{D}^{0}$-jets give access to an enriched quark-initiated sample of jets, providing a new opportunity to explore the differences between quark and gluon fragmentations in vacuum, down to low charged jet transverse momenta ($p_{\rm{T}}^{\rm{jet, ch}}$). The inclusive jet sample in this region of phase-space is dominated by gluon-initiated jets, allowing for meaningful comparisons with the measured $\rm{D}^{0}$-jet results. The mass effects of heavy flavour quarks are also expected to be strongest in this regime. The first measurements, in $\rm{D}^{0}$-jets, of the shared momentum fraction of groomed two prong jet substructure, $z_{\rm{g}}$, and the aperture angle between these prongs, $R_{\rm{g}}$, are presented. The grooming technique employed is iterative Soft Drop with parameters $z_{\rm{cut}}$ = 0.1 and $\beta$ = 0. In addition, measurements of the number of branches satisfying the grooming condition, $n_{\rm{SD}}$, are also presented. The results are presented in the 15 ≤ $p_{\rm{T}}^{\rm{jet, ch}}$ < 30 GeV/c range and are compared to measured inclusive jets as well as theoretical models. Such measurements also provide a reference for future $\rm{D}^{0}$-jet substructure measurements in heavy-ion collisions, to explore the different energy loss of gluon, light quark and heavy quark initiated jets, in the presence of a deconfined QCD medium.