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

Abstract

A search for chargino$-$neutralino pair production in three-lepton final states with missing transverse momentum is presented. The study is based on a dataset of $\sqrt{s}=13$ TeV $pp$ collisions recorded with the ATLAS detector at the LHC, corresponding to an integrated luminosity of 139 fb${}^{-1}$. No significant excess relative to the Standard Model predictions is found in data. The results are interpreted in simplified models of supersymmetry, and statistically combined with results from a previous ATLAS search for compressed spectra in two-lepton final states. Various scenarios for the production and decay of charginos (${\tilde{\chi }}_1^{\pm }$) and neutralinos (${\tilde{\chi }}_2^0$) are considered. For pure higgsino ${\tilde{\chi }}_1^{\pm }{\tilde{\chi }}_2^0$ pair-production scenarios, exclusion limits at 95% confidence level are set on ${\tilde{\chi }}_2^0$ masses up to 210 GeV. Limits are also set for pure wino ${\tilde{\chi }}_1^{\pm }{\tilde{\chi }}_2^0$ pair production, on ${\tilde{\chi }}_2^0$ masses up to 640 GeV for decays via on-shell $W$ and $Z$ bosons, up to 300 GeV for decays via off-shell $W$ and $Z$ bosons, and up to 190 GeV for decays via $W$ and Standard Model Higgs bosons.

104 pages in total, author list starting page 89, 20+14aux figures, 21+19aux tables, submitted to EPJC. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2019-09/

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