Measurement of coherent $J/\psi$ in ultraperipheral Pb+Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.36$~TeV with the ATLAS detector
The fully stripped ions used in heavy-ion collisions at the LHC are an excellent source of high-energy quasi-real photons. These can interact with photons emitted by the oncoming nucleus, or with the nucleus itself, either directly in inelastic processes or diffractively via pomeron exchange. Diffractive photonuclear p...