Ponente
Descripción
We reanalyze the lattice QCD data for the isoscalar $J^P=0^+$ and $1^+$ $\bar b \bar c u d$ systems at $m_{\pi}\simeq 220$ MeV by incorporating both short- and long-range interactions. Using the interaction constrained by the lattice results, we predict a spectrum of isoscalar $B^{(*)}\bar D{}^{(*)}$ molecular states with quantum numbers $J^{P}=0^+$, $1^+$, and $2^+$. The predicted $J^P=0^+$ and $1^+$ $B\bar D$ and $B^*\bar D$ bound states are consistent with the lattice data. Moreover, the two resonances reported by the lattice collaboration in the $J^P=0^+$ and $1^+$ $\bar b \bar c u d$ channels are naturally interpreted as the $B^*\bar D{}^{*}$ and $B\bar D{}^{*}$ hadronic molecules, respectively. We further predict two previously unreported $B^*\bar D{}^{*}$ states with quantum numbers $J^P=1^+$ and $2^+$, corresponding to a bound state and a virtual state, respectively. Our results provide a unified interpretation of the lattice spectrum and highlight the important interplay between short- and long-range interactions in the dynamics of the $B^{(*)}\bar D{}^{(*)}$ systems.
