Search for a standard model-like Higgs boson in the mass range between 70 and 110$~\mathrm{GeV}$ in the diphoton final state in proton-proton collisions at $\sqrt{s}=13~\mathrm{TeV}$

The results of a search for a standard model-like Higgs boson in the mass range between 70 and 110$~\mathrm{GeV}$ decaying into two photons are presented. The analysis uses the data set collected with the CMS experiment in proton-proton collisions corresponding to, respectively, $36.3~\mathrm{fb}^{-1}$, $41.5~\mathrm{fb}^{-1}$ and $54.4~\mathrm{fb}^{-1}$, during the 2016, 2017 and 2018 LHC running periods, at $\sqrt{s}=13~\mathrm{TeV}$. The expected and observed $95\%$ confidence level upper limits on the product of the cross section and branching fraction into two photons are presented. The observed upper limit for the combined data set ranges from $73~\mathrm{fb}$ to $15~\mathrm{fb}$.