Speaker
Description
Hybrid baryons, in which gluonic degrees of freedom play an explicit dynamical role, provide a key testing ground for nonperturbative quantum chromodynamics. Yet they remain largely unexplored compared to their meson counterparts. Indeed, due to a more complex internal composition, their characteristics are much more intricate to predict using theoretical computations, and no definitive result can be obtained from this side up to now. The experimental level also presents issues: contrary to hybrid mesons, no exotic quantum number is associated with hybrid baryons. Therefore, to be able to detect such particles, it is crucial to get access to their dynamic properties, such as their mass or decay rates. A reliable way to do so is to consider QCD-inspired phenomenological models. This work relies on the constituent framework and develops a "quark-core gluon model". This approach suggests to first bring the three constituent quarks together within a core, and then make this core interact with the constituent gluon as a two-body system.
The talk starts by reviewing the general assumptions made within constituent models. Then, it introduces the quark-core gluon models, emphasizing on the methodology that this framework implies. The presentation closes on the analysis of the mass spectrum, as well as the comparison with Lattice QCD and QCD sum rules data. A particular attention is devoted to the lightest particles, since they are expected to be detected first.