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A signal of two leptons and missing energy is challenging to analyze at theLarge Hadron Collider (LHC) since it offers only few kinematical handles. Thissignature generally arises from pair production of heavy charged particleswhich each decay into a lepton and a weakly interacting stable particle. Herethis class of processes is analyzed with minimal model assumptions byconsidering all possible combinations of spin 0, 1/2 or 1, and of weakiso-singlets, -doublets or -triplets for the new particles. Adding to existingwork on mass and spin measurements, two new variables for spin determinationand an asymmetry for the determination of the couplings of the new particlesare introduced. It is shown that these observables allow one to independentlydetermine the spin and the couplings of the new particles, except for a fewcases that turn out to be indistinguishable at the LHC. These findings arecorroborated by results of an alternative analysis strategy based on anautomated likelihood test.

General analysis of signals with two leptons and missing energy at the Large Hadron Collider