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A search for new physics with non-resonant signals in dielectron and dimuonfinal states in the mass range above 2 TeV is presented. This is the firstsearch for non-resonant signals in dilepton final states at the LHC to use abackground estimate from the data. The data, corresponding to an integratedluminosity of 139 fb$^{-1}$, were recorded by the ATLAS experiment inproton-proton collisions at a center-of-mass energy of $\sqrt{s} = 13$ TeVduring Run 2 of the Large Hadron Collider. The benchmark signal signature is atwo-quark and two-lepton contact interaction, which would enhance the dileptonevent rate at the TeV mass scale. To model the contribution from backgroundprocesses a functional form is fit to the dilepton invariant-mass spectra indata in a mass region below the region of interest. It is then extrapolated toa high-mass signal region to obtain the expected background there. Nosignificant deviation from the expected background is observed in the data.Upper limits at 95 % CL on the number of events and the visible cross-sectiontimes branching fraction for processes involving new physics are provided.Observed (expected) 95 % CL lower limits on the contact interaction energyscale reach 35.8 (37.6) TeV.

Search for new non-resonant phenomena in high-mass dilepton final states with the ATLAS detector