Search for new physics in final states with a single photon plus missing transverse momentum in proton-proton collisions at $\sqrt{s}=13~\mathrm{TeV}$ using 2016 data

A search is conducted for new physics in final states containing a photon and missing transverse momentum in proton-proton collisions at $\sqrt{s}=13~\mathrm{TeV}$, using the data collected by the CMS experiment at the CERN LHC in 2016 corresponding to an integrated luminosity of $35.9~\mathrm{fb}^{-1}$. No deviations are observed relative to the predictions of the standard model. The results are interpreted in the context of dark matter production and models containing extra spatial dimensions. For the simplified dark matter production models considered, the observed (expected) exclusion for the mediator masses is $950 (1150)~\mathrm{GeV}$ for $1~\mathrm{GeV}$ dark matter mass. For an effective dimension-7 photon-dark matter contact interaction, the observed (expected) values of the suppression parameter $\Lambda$ up to $850 (950)~\mathrm{GeV}$ are excluded. For the model with extra spatial dimensions, values of the effective Planck scale up to $2.85 - 2.90~\mathrm{TeV}$ are excluded, depending on the number of extra dimensions.