Search for Physics beyond the Standard Model in Events with Overlapping Photons and Jets

Results are reported from a search for new particles that decay into aphoton and two gluons, in events with jets. Novel jet substructuretechniques are developed that allow photons to be identified in anenvironment densely populated with hadrons. The analyzed proton-protoncollision data were collected by the CMS experiment at the LHC, in 2016at root s = 13 TeV, and correspond to an integrated luminosity of 35.9fb(-1). The spectra of total transverse hadronic energy of candidateevents are examined for deviations from the standard model predictions.No statistically significant excess is observed over the expectedbackground. The first cross section limits on new physics processesresulting in such events are set. The results are interpreted as upperlimits on the rate of gluino pair production, utilizing a simplifiedstealth supersymmetry model. The excluded gluino masses extend up to 1.7TeV, for a neutralino mass of 200 GeV and exceed previous massconstraints set by analyses targeting events with isolated photons.