Supersymmetric models with leptonic R-parity violation for new physics searches with the ATLAS detector

Supersymmetry is one of the most popular and well-motivated extensions to the Standard Model. If TeV-scale sparticles exist, they should be produced copiously in proton-proton collisions at the Large Hadron Collider. However, to date, none have been observed. One explanation of this could be that R-parity, usually assumed to be conserved, is broken. R-parity conservation implies that the lightest supersymmetric particle (LSP) is stable, while its violation allows it to decay, with dramatic consequences for the expected experimental signatures of these events. In this talk, we describe models used by the ATLAS experiment with leptonic R-parity violation. This is described by a term λijk Li Lj anti Ek added to the usual minimal supersymmetric superpotential. This results typically in a very high lepton multiplicity in the final state, for example from the decay χ10 → l+l'-ν. Recent ATLAS searches for anomalous events with four or more electrons or muons have tested these models. The phenomenology and challenges of these final states are discussed, and possible future search strategies discussed.