Incorporating $DD\ddot{I}€$ effects and left-hand cuts in lattice QCD studies of the $T_{cc}(3875{)}^{+}$

Maxwell T. Hansen, Fernando Romero-López, Stephen R. Sharpe

We generalize the relativistic field-theoretic three-particle finite-volume scattering formalism to describe generic $DD\ddot{I}€$ systems in the charm $C=2$ sector. This includes the iso…