Lattice QCD investigation of a doubly-bottom $\bar{b}\bar{b}ud$ tetraquark with quantum numbers $I(J^P)=0(1^{+})$

Abstract

We use lattice QCD to investigate the spectrum of the $\bar{b}\bar{b}ud$ four-quark system with quantum numbers $I(J^P)=0(1^{+})$. We use five different gauge-link ensembles with $2+1$ flavors of domain-wall fermions, including one at the physical pion mass, and treat the heavy $\bar{b}$ quark within the framework of lattice nonrelativistic QCD. Our work improves upon previous similar computations by considering in addition to local four-quark interpolators also nonlocal two-meson interpolators and by performing a Lüscher analysis to extrapolate our results to infinite volume. We obtain a binding energy of $(-128\pm 24\pm 10)\text{MeV}$, corresponding to the mass $(10476\pm 24\pm 10)\text{MeV}$, which confirms the existence of a $\bar{b}\bar{b}ud$ tetraquark that is stable with respect to the strong and electromagnetic interactions.

arXiv comment27 pages, 13 figures

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