The ExoHad Collaboration


The Exo(tic) Had(ron) Collaboration started in 2023 to explore all aspects of exotic hadron physics, from predictions within lattice QCD, through reliable extraction of their existence and properties from experimental data, to descriptions of their structure within phenomenological models.

ExoHad patchwork

A Constituent Model of Light Hybrid Meson Decays


The discovery of hybrid mesons will be greatly simplified if their couplings to decay channels are understood. To this end, Christian Farina (Pitt graduate student) and
Eric Swanson (Pitt, co-PI), have modeled hybrid decay in terms of gluon dissociation as specified by the Hamiltonian of QCD in Coulomb gauge. The results indicate that direct observation of the light vector hybrid will be difficult, that the hybrid $\pi(1800)$ has distinct decay characteristics, and that a hybrid $\eta_1(1750)$ Read more

Three particles with coupled channels


The extension of the three-particles formalism to multiple three-particle channels has been carried out by ExoHad members
Zack Draper (UW graduate student) and Steve Sharpe (UW, co-PI), in a paper submitted to the arXiv. This is done in the context of the $\pi\pi\eta$ and $K \bar K \pi$ system in isosymmetric QCD, where, if one enforces positive G parity, as well as conservation of $J^P$, there is no mixing with the $2\pi$ or $3\pi$ systems. This two-channel system is suitable for studying the Read more