Searches for new phenomena in leptonic final states using the ATLAS detector

Resonances decaying to leptons are very common in various BSM theories such as the Grand Unification theory, Left-Right Symmetric model, Sequential Standard Model, Two-Higgs-Doublet model, Higgs triplet, and many more. Final states with leptons have lower backgrounds and are something to trigger on. Furthermore, the detector resolution allows a good measurement of the invariant mass of BSM resonances decaying to electrons and muons. The talk covers several searches for new resonances decaying into electrons and muons and presents the technical challenges, along with the tangible solutions, that these searches are facing.