Measurement of light-by-light scattering and the Breit-Wheeler process, and search for axion-like particles in ultraperipheral PbPb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV

CMS Collaboration

Measurements of light-by-light scattering (LbL, $\gamma \gamma$ $\to$ $\gamma \gamma$) and the Breit-Wheeler process (BW, $\gamma \gamma$ $\to$ ${\mathrm{e}}^{+}{\mathrm{e}}^{-}$) are reported in ultraperipheral PbPb collisions at…