Abstract
Results from a search for supersymmetry in events with four or more charged leptons (electrons, muons and taus) are presented. The analysis uses a data sample corresponding to 36.1 fb$^{-1}$ of proton-proton collisions delivered by the Large Hadron Collider at $\sqrt{s}=13$ TeV and recorded by the ATLAS detector. Four-lepton signal regions with up to two hadronically decaying taus are designed to target a range of supersymmetric scenarios that can be either enriched in or depleted of events involving the production and decay of a $Z$ boson. Data yields are consistent with Standard Model expectations and results are used to set upper limits on the event yields from processes beyond the Standard Model. Exclusion limits are set at the 95% confidence level in simplified models of General Gauge Mediated supersymmetry, where higgsino masses are excluded up to 295 GeV. In $R$-parity-violating simplified models with decays of the lightest supersymmetric particle to charged leptons, lower limits of 1.46 TeV, 1.06 TeV, and 2.25 TeV are placed on wino, slepton and gluino masses, respectively.
Highlights
Supersymmetry (SUSY) [1,2,3,4,5,6] is a space-time symmetry that postulates the existence of new particles with spin differing by one half-unit from their Standard Model (SM) partners
This paper presents a search for new physics in final states with at least four isolated, charged leptons where up to two hadronically decaying taus are considered
Since the analysis reported here uses similar techniques, the number of L-violating RPV scenarios studied is reduced by making no distinction between the electron and muon decay modes of the χ01
Summary
Supersymmetry (SUSY) [1,2,3,4,5,6] is a space-time symmetry that postulates the existence of new particles with spin differing by one half-unit from their Standard Model (SM) partners. In supersymmetric extensions of the SM, each SM fermion (boson) is associated with a SUSY boson (fermion), having the same quantum numbers as its partner except for spin The introduction of these new SUSY particles provides a potential solution to the hierarchy problem [7,8,9,10]. In R-parityconserving (RPC) models, the LSP is stable and leptons can originate from unstable weakly interacting sparticles decaying into the LSP Both the RPV and RPC SUSY scenarios can result in signatures with high lepton multiplicities and substantial missing transverse momentum, selections on which can be used to suppress SM background processes effectively. Results are presented in terms of the number of events from new physics processes with a four charged lepton signature, and in terms of RPV and RPC SUSY models. This analysis closely follows the 7 TeV [19] and 8 TeV [22] ATLAS analyses
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