Three-body hadronic reactions from Lattice QCD with Sebastian Dawid

Over the past two decades, the discovery of unexpected exotic resonances has challenged the traditional quark model of hadrons. Candidates for tetraquarks, pentaquarks, molecular states, hybrids, and glueballs have revitalized hadron spectroscopy. Many of these intriguing states decay into three or more particles, making their interpretation particularly challenging. Due to poorly understood three-body interactions, extracting their masses and widths requires advanced techniques at the intersection of lattice QCD and scattering theory.

In this talk, I will review recent formal developments in this fast-growing field, emphasizing the analytic properties of on-shell three-particle amplitudes. As case studies, I will discuss recent results on Efimov states, the doubly charmed tetraquark Tcc, and mixed systems of light mesons, and I will outline future directions in this area.

This lecture was made possible by the William C. Ferguson Fund.