Speaker
Description
The flavour dependence of parton showers presents a unique opportunity to explore fundamental properties of QCD interactions. In particular, the substructure of low-energy jets containing heavy-flavour hadrons provides experimental access to both mass effects as well as the impact of Casimir colour factors. Using novel tracing methods, splittings of charm quarks are isolated to measure fundamental properties such as the dead-cone effect and the charm-quark splitting function. By using the new high statistics data samples of Run 3, we present new measurements of the dead-cone effect and splitting function of charm quarks, differentially in the energy of the emitter, through measurements of jets tagged with a reconstructed $\rm{D}^{0}$ meson. At the low energies uniquely accessible to the ALICE experiment, comparisons of these measurements to an inclusive-jet baseline probe the evolution of the dead-cone of charm quarks with unprecedented accuracy. With increasing energy of the emitting charm quark, the dead-cone angle is predicted to get smaller, allowing for the isolation of the impact of Casimir colour factors. Such differential measurements in the charm sector not only illuminate the role of mass and Casimir colour factors when compared to inclusive jets, but also provide a lower mass heavy quark-enriched sample which is crucial for comparisons to measurements in the beauty sector, in order to isolate the mass dependence of the dead-cone effect.
| Category | Experiment |
|---|---|
| Collaboration (if applicable) | ALICE |
