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Quasireal photons exchanged in relativistic heavy ion interactions arepowerful probes of the gluonic structure of nuclei. The coherent J/$\psi$photoproduction cross section in ultraperipheral lead-lead collisions ismeasured as a function of photon-nucleus center-of-mass energies per nucleon(W$^\text{Pb}_{\gamma\text{N}}$), over a wide range of 40 $\lt$W$^\text{Pb}_{\gamma\text{N}}$ $\lt$ 400 GeV. Results are obtained using dataat the nucleon-nucleon center-of-mass energy of 5.02 TeV collected by the CMSexperiment at the CERN LHC, corresponding to an integrated luminosity of 1.52nb$^{-1}$. The cross section is observed to rise rapidly at lowW$^\text{Pb}_{\gamma\text{N}}$, and plateau aboveW$^\text{Pb}_{\gamma\text{N}}$ $\approx$ 40 GeV, up to 400 GeV, a new regime ofsmall Bjorken-$x$ ($\approx$ 6 $\times$ 10$^{-5}$) gluons being probed in aheavy nucleus. The observed energy dependence is not predicted by currentquantum chromodynamic models.

cornell university

Probing small Bjorken-$x$ nuclear gluonic structure via coherent  J/$\psi$ photoproduction in ultraperipheral PbPb collisions at  $\sqrt{s_\mathrm{NN}}$ = 5.02 TeV