Search for signatures of electroweakinos with photons, jets, and large missing transverse momentum in $\sqrt{s}=13$ TeV pp collisions with the ATLAS detector

TL;DR

This paper reports a search for electroweakinos in proton-proton collisions at 13 TeV using ATLAS data, finding no significant excess and setting exclusion limits on gaugino masses up to 1.2 TeV.

Contribution

First search using full Run-2 ATLAS data for electroweakinos with photons, jets, and missing energy, setting new exclusion limits on gaugino masses.

Findings

No significant excess observed over Standard Model predictions.

Gaugino masses up to 1.2 TeV are excluded depending on branching ratios.

Model-dependent exclusion limits are established at 95% confidence level.

Abstract

A search for final states characterised by at least one isolated high transverse-momentum photon, jets and large missing transverse momentum is presented. Such a final state might occur in gauge-mediated supersymmetric models where a pair of binos and higgsinos mix to form neutralinos, one of which decays into a photon plus a gravitino while the other decays into a Higgs boson, a Z boson or a photon, plus a gravitino. The search is performed using the full Run-2 data sample of 140 fb$^{-1}$ of $\sqrt{s}=13$ TeV proton-proton collisions collected by the ATLAS detector at the Large Hadron Collider. No significant excess of events is observed above the Standard Model prediction and model-dependent exclusion limits at the 95% confidence level are set. These limits are interpreted in terms of the masses of gauginos, which are excluded up to 1.2 TeV depending on their branching ratios, and on their branching ratios as a function of their mass.