Do heavy tetraquarks hide in photon collisions at the LHC?

When two lead nuclei graze each other at the LHC, the intense electromagnetic fields can produce exotic four-quark particles. This work calculates whether rare tetraquark states decay into photon pairs or J/ψ mesons frequently enough to be observed in these ultraperipheral collisions. They find the J/ψ channel shows clear resonant peaks, but photon pairs are dominated by background processes—contradicting naive expectations from standard hadronic physics analogies.