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A search for physics beyond the Standard Model inducing periodic signals inthe dielectron and diphoton invariant mass spectra is presented using 139fb$^{-1}$ of $\sqrt{s}=13$ TeV $pp$ collision data collected by the ATLASexperiment at the LHC. Novel search techniques based on continuous wavelettransforms are used to infer the frequency of periodic signals from theinvariant mass spectra and neural network classifiers are used to enhance thesensitivity to periodic resonances. In the absence of a signal, exclusionlimits are placed at the 95\% confidence level in the two-dimensional parameterspace of the clockwork gravity model. Model-independent searches for deviationsfrom the background-only hypothesis are also performed.

the journal of high energy physics/the journal of high energy physics

Search for periodic signals in the dielectron and diphoton invariant  mass spectra using 139 fb$^{-1}$ of $pp$ collisions at $\sqrt{s} =$ 13 TeV  with the ATLAS detector