Speaker
Description
We study tetraquark resonances for a pair of static quarks $\bar{b}\bar{b}$ in presence of two light quarks $ud$ based on lattice QCD potentials. The system is treated in the Born-Oppenheimer approximation and we use the emergent wave method. We focus on the isospin $I=0$ channel but take different angular momenta $l$ of the heavy quarks $\bar{b}\bar{b}$ into account. Further calculations have already predicted a bound state for the $l=0$ case with quantum numbers $I(J^P)=0(1^+)$. Performing computations for several angular momenta, we extract the phase shifts and search for T and S matrix poles in the second Riemann sheet. For angular momentum $l=1$, we predict a tetraquark resonance with quantum numbers $I(J^P)=0(1^-)$, resonance mass $m=10576^{+4}_{-4}~\text{MeV}$ and decay width $\Gamma= 112^{+90}_{-103}~\text{MeV}$, which decays into two $B$ mesons.
