Search for new phenomena in multi-body invariant masses in events with at least one isolated lepton using √𝒔 = 13 TeV proton–proton collision data collected by the ATLAS detector

A search for resonances in events with at least one isolated charged lepton (e or μ) is performed using 139fb−1 of s√=13 TeV proton-proton collision data recorded by the ATLAS detector at the LHC. Deviations from a smoothly falling background hypothesis are tested in three- and four-body invariant mass distributions constructed from leptons and jets, including jets identified as originating from bottom quarks. Model-independent limits on generic resonances characterized by cascade decays of particles leading to multiple jets and leptons in the final state are presented. The limits are calculated using Gaussian shapes with different widths for the invariant masses. The multibody invariant masses are also used to set 95% confidence level upper limits on the cross-section times branching ratios for the production and subsequent decay of resonances as predicted by several new physics scenarios.