Measurement of the production cross section for pp to Z(nu nu) gamma at sqrt(s) = 13 TeV at CMS

A measurement of the $\mathrm{Z}\gamma \rightarrow \nu\overline{\nu}\gamma$ cross section in pp collisions at $\sqrt{s}=13\,\mathrm{TeV}$ is presented, using data corresponding to an integrated luminosity of $2.3\,\mathrm{fb}^{-1}$ collected with the CMS detector at the LHC. Events are selected requiring a single photon with transverse momentum above $175\,\mathrm{GeV}$ within the pseudorapidity range $|\eta| < 1.44$ accompanied by missing transverse energy above $170\,\mathrm{GeV}$. The measured ${\mathrm{Z}\gamma \rightarrow \nu\overline{\nu}\gamma}$ production cross section, 66.5 $\pm$ 13.6 (stat) $\pm$ 14.3 (syst) $\pm$ 2.2 (lumi) fb for a single photon with transverse momentum above $175\,\mathrm{GeV}$ within the pseudorapidity range $|\eta| < 1.44$, agrees within uncertainties with the next-to-next-to-leading order standard model prediction of $65.5 \pm 3.3$ fb.