Search for direct production of electroweakinos in final states with missing transverse momentum and a Higgs boson decaying into photons in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

Abstract

A search for a chargino$-$neutralino pair decaying via the 125 GeV Higgs boson into photons is presented. The study is based on the data collected between 2015 and 2018 with the ATLAS detector at the LHC, corresponding to an integrated luminosity of 139 fb${}^{-1}$ of $pp$ collisions at a centre-of-mass energy of 13 TeV. No significant excess over the expected background is observed. Upper limits at 95% confidence level for a massless ${\tilde{\chi }}_1^0$ are set on several electroweakino production cross-sections and the visible cross-section for beyond the Standard Model processes. In the context of simplified supersymmetric models, 95% confidence-level limits of up to 310 GeV in $m({\tilde{\chi }}_1^{\pm }/{\tilde{\chi }}_2^0)$, where $m({\tilde{\chi }}_1^0)=0.5$ GeV, are set. Limits at 95% confidence level are also set on the ${\tilde{\chi }}_1^{\pm }{\tilde{\chi }}_2^0$ cross-section in the mass plane of $m({\tilde{\chi }}_1^{\pm }/{\tilde{\chi }}_2^0)$ and $m({\tilde{\chi }}_1^0)$, and on scenarios with gravitino as the lightest supersymmetric particle. Upper limits at the 95% confidence-level are set on the higgsino production cross-section. Higgsino masses below 380 GeV are excluded for the case of the higgsino fully decaying into a Higgs boson and a gravitino.

46 pages in total, author list starting on page 30, 11 figures, 4 tables, submitted to JHEP. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2018-23

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Cited by in corpus (13)

• Search for chargino--neutralino pair production in final states with three leptons and missing transverse momentum in $\sqrt{s}=13$ TeV $pp$ collisions with the ATLAS detector
• Supersymmetric Interpretation of the Muon $g-2$ Anomaly
• Search for charginos and neutralinos in final states with two boosted hadronically decaying bosons and missing transverse momentum in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Muon g-2 vs LHC Run 2 in Supersymmetric Models
• Search for higgsinos decaying to two Higgs bosons and missing transverse momentum in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Precise Measurements of the Decay of Free Neutrons
• SModelS v2.3: enabling global likelihood analyses
• Muon $g-2$ in Gauge Mediation without SUSY CP Problem
• Combined search for electroweak production of winos, binos, higgsinos, and sleptons in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Status of searches for electroweak-scale supersymmetry after LHC Run 2
• Building Kinetic Mixing From Scalar Portal Matter
• Shedding Light on Dark Matter at the LHC with Machine Learning
• Lepton-flavor violation and two loop electroweak corrections to $(g-2{)}_{\mu }$ in the triplets