The $T_{bc}$ tetraquarks near the $B\bar{D}$ threshold

We study the doubly heavy open-flavor tetraquarks $T_{bc}^{(0)}$ ($J^{P}=0^{+}$) and $T_{bc}^{(1)}$ ($J^{P}=1^{+}$) in the dynamical diquark model, treating them as heavy antidiquark--light diquark systems interacting through the lattice-QCD $Σ_g^+(1S)$ Born--Oppenheimer potential. Solving the radia