# Combined search for supersymmetry with photons in proton-proton collisions at $\sqrt{s} =$ 13 TeV

## TL;DR

This paper combines four CMS searches involving photons and missing transverse momentum to enhance sensitivity to gauge-mediated supersymmetry, setting new limits on SUSY particle masses with 13 TeV proton-proton collision data.

## Contribution

It presents the first combined CMS analysis of photon-based SUSY searches at 13 TeV, improving sensitivity to gauge-mediated SUSY models by up to 100 GeV in particle mass limits.

## Key findings

- No excess events beyond Standard Model expectations.
- Extended sensitivity to SUSY particle masses by up to 100 GeV.
- First CMS combination of photon-based SUSY searches at 13 TeV.

## Abstract

A combination of four searches for new physics involving signatures with at least one photon and large missing transverse momentum, motivated by generalized models of gauge-mediated supersymmetry (SUSY) breaking, is presented. All searches make use of proton-proton collision data at $\sqrt{s} =$ 13 TeV, which were recorded with the CMS detector at the LHC in 2016, and correspond to an integrated luminosity of 35.9 fb$^{-1}$. Signatures with at least one photon and large missing transverse momentum are categorized into events with two isolated photons, events with a lepton and a photon, events with additional jets, and events with at least one high-energy photon. No excess of events is observed beyond expectations from standard model processes, and limits are set in the context of gauge-mediated SUSY. Compared to the individual searches, the combination extends the sensitivity to gauge-mediated SUSY in both electroweak and strong production scenarios by up to 100 GeV in neutralino and chargino masses, and yields the first CMS result combining various SUSY searches in events with photons at $\sqrt{s} =$ 13 TeV.