Beauty-full Tetraquarks

In this article we present a calculation of the $bb\bar{b}\bar{b}$ tetraquark ground-state energy using a diffusion Monte Carlo method to solve the non-relativistic many-body system. The static potential for the four quark system is chosen to align with the flux-tube picture of QCD. Using this approach, we find that the $0^{++}$ state has a mass of $18.69\pm 0.03~\mbox{GeV}$,whichisaround100MeVbelowtwicethe$\eta_b$ mass. This bound state can behave as a four-lepton resonance via its decay to $\mathrm{{\rm Y}}(1S)\mathrm{{\rm Y}}(1S{)}^{\ast }\to {\mathrm{\ell }}^{+}{\mathrm{\ell }}^{-}{\mathrm{\ell }}^{+}{\mathrm{\ell }}^{-}$.