  This note represents an attempt to gather the input related to light-by-light
scattering ($\gamma\gamma$) cross-section measurements at LHC with the aim of
checking the consistency with different standard model predictions. For the
first time, we also consider the contribution from the $\eta_b(1S)$ meson
production to the diphoton invariant mass distribution, by calculating its
inclusive photoproduction cross-section. Using a simplified set of assumptions,
we find a result of $115\pm 19\,\,\text{nb}$, consistent with standard model
predictions within two standard deviations. Although an improved determination
of the integrated fiducial $\textrm{PbPb}\,(\gamma\gamma)\to
\textrm{Pb}^{(\ast)}\textrm{+}\textrm{Pb}^{(\ast)}\,\gamma\gamma$ cross-section
by approximately 10\% could be potentially achieved relative to current
measurements, further improvements are expected with the inclusion of existing
or forthcoming LHC nuclear data.
