# Search for physics beyond the standard model in events with overlapping photons and jets

## TL;DR

This paper reports a search for new particles decaying into a photon and two gluons using CMS data, developing novel jet substructure techniques to identify photons in hadronic environments, and sets new limits on gluino masses.

## Contribution

It introduces new jet substructure methods for photon identification in dense hadronic environments and provides the first cross section limits for such processes.

## Key findings

- No significant excess over the standard model background.
- Excluded gluino masses up to 1.7 TeV.
- Sets new constraints surpassing previous photon-based analyses.

## Abstract

Results are reported from a search for new particles that decay into a photon and two gluons, in events with jets. Novel jet substructure techniques are developed that allow photons to be identified in an environment densely populated with hadrons. The analyzed proton-proton collision data were collected by the CMS experiment at the LHC, in 2016 at $\sqrt{s} =$ 13 TeV, and correspond to an integrated luminosity of 35.9 fb$^{-1}$. The spectra of total transverse hadronic energy of candidate events are examined for deviations from the standard model predictions. No statistically significant excess is observed over the expected background. The first cross section limits on new physics processes resulting in such events are set. The results are interpreted as upper limits on the rate of gluino pair production, utilizing a simplified stealth supersymmetry model. The excluded gluino masses extend up to 1.7 TeV, for a neutralino mass of 200 GeV and exceed previous mass constraints set by analyses targeting events with isolated photons.