Importance of mesons in light-by-light scattering in ultraperipheral lead-lead collisions at the LHC

Abstract

Possibility of PbPb$\to$PbPb$\gamma \gamma$ measurement at smaller (< 5 GeV) diphoton invariant mass will be presented. Analysis focuses only on ultraperipheral heavy-ion collisions. This estimate shows that the $\gamma \gamma \to \gamma \gamma$ collisions can be measured at the LHC by ALICE and LHCb experiments for diphoton invariant mass $>$ 2 GeV. Predictions for the $\gamma \gamma \to \eta ,{\eta }^{\prime }\to \gamma \gamma$ resonance scattering shows that these resonances can be measured with rather good statistics. A~possible observation of peaks related to intermediate $\eta$, ${\eta }^{\prime }(958)$, ${\eta }_c(1S)$, ${\eta }_c(2S)$, ${\chi }_{c0}(1P)$ mesons will be presented too. Attempts of reduction of background which comes from dipion production will be considered.

Comments: 4 pages, 3 figures, 1 table, MESON2018 - the 15th International Workshop on Meson Physics