Search for GMSB supersymmetry in events with at least one photon and missing transverse momentum in pp collisions at sqrt(s) = 13 TeV

A search for supersymmetry with gauge-mediated supersymmetry breaking in electroweak and strong production and final states with photons and large missing transverse momentum is presented in this note. The data sample was collected in 2016 in pp collisions at $\sqrt{s}=13$ TeV with the CMS detector at the LHC and corresponds to an integrated luminosity of $35.9~\mathrm{fb}^{-1}$. Scenarios are studied, in which the lightest neutralino has bino- or wino-like components, resulting in decays to photons and gravitinos, where the gravitinos escape undetected. The event selection was optimised for high sensitivity to both electroweak and strong production SUSY scenarios. No indication for the presence of new physics is observed. The analysis excludes gaugino masses below 750 GeV at the $95\%$ confidence level in a simplified model with electroweak production of mass-degenerate charginos and neutralinos and sets stringent limits in four strong production simplified models based on gluino and squark pair-production. The analysis currently sets the most stringent limits in the electroweak model studied and in the compressed mass phase space of the strong production models. $$\textit{This document has been revised with respect to the version dated March 23, 2017.}$$