Discovery potentials of double-charm tetraquarks *

In this study, we investigate the discovery potential of double-charm tetraquarks $T^{\{cc\}}_{[\bar{q}\bar{q}']}$. We find that their production cross sections at LHCb with $\sqrt{s} = 13$ TeV reach $\mathcal{O}(10^4)$ pb, which indicates has collected $\mathcal{O}(10^8)$ such particles. Through decay channels $T^{\{cc\}}_{[\bar{u}\bar{d}]}\to D^{+}K^{-}\pi^{+}$ or $D^0D^+\gamma$ (if stable) D^0D^{*+}\to D^0D^0\pi^+$ unstable), it is highly expected they get discovered in near future. also discuss productions and decays future Tera-$Z$ factories.