Speaker
Description
Measurements of the properties of jets initiated by a charm quark represent a valuable tool to investigate the properties of quantum chromodynamics (QCD) processes such as the evolution of the heavy-flavour quark parton shower and hadronisation processes.
Casmir colour effects (different for quarks vs gluons) and mass effects (driven by the dead cone of heavy quarks), impact the properties of the resultant showers and can be accessed by the study of heavy-flavour tagged jets. In a complementary approach to charm-tagged jets, azimuthal correlations between charmed hadrons and charged particles provide a differential description of charm-jet shape and composition in terms of the transverse momentum of associated particles. Additionally, the comparison of correlation-peak measurements for different charm-hadron species can help to better understand the charm hadronisation mechanism, and investigate the possibility of different mechanisms in addition to in-vacuum fragmentation.
In this talk, we report a measurement of the longitudinal jet momentum fraction carried by $\Lambda_\mathrm{c}^+$ baryons compared to that carried by $\mathrm{D}^0$ mesons, in pp collisions at $\sqrt{s} = 13.6$ TeV collected during the LHC Run 3. In addition, we present the measurements of the first perturbative splitting selected by the Soft Drop algorithm for jets tagged with a $\mathrm{D}^0$ meson, which map onto the properties of the charm splitting function. We report new results of angular correlations of between strange and non-strange D-meson correlation and charged particles in pp collisions at $\sqrt{s} = 13.6$ TeV, to investigate the influence of strangeness on the charm hadronisation process. We also compare the measurement of angular correlations between $\Lambda_\mathrm{c}^+$ baryons and charged particles in pp collisions at $\sqrt{s} = 13$ TeV and compare the results with equivalent D-meson and charged particle results, providing insights into the differences in charm hadronisation between charm baryons and mesons. The measurements are compared with state-of-the-art Monte Carlo predictions and models implementing different charm production and hadronisation mechanisms. Finally, we present new results of $\Lambda_\mathrm{c}^$- proton correlations, to study the angular range of baryon-number conservation in the charm fragmentation process.
