Doubly heavy hadron production in ultraperipheral collisions

The inclusive production of pseudoscalar heavy quarkonia (${\eta }_c,{\eta }_b,B_c$), double heavy baryons ${\mathrm{\Xi }}_{Q{Q}^{\mathrm{\prime }}}$ ($Q^{(\mathrm{\prime })}=c,b$ quarks) and tetraquarks $T_{QQ}$ in heavy ion ultraperipheral collisions (UPCs) is studied. Numerical results indicate that the experimental investigation of ${\eta }_c,{\mathrm{\Xi }}_{cc}$, and $T_{cc}$ is feasible at the upcoming HL-LHC and future FCC. Heavy ion UPCs open another avenue for studying the production of these doubly heavy hadrons.