Light Sterile Neutrinos, Lepton Number Violating Interactions and Short Baseline Neutrino Experiments

We develop the consequences of introducing a purely leptonic, non-standard interaction (NSI) Delta L = 2, four-fermion effective Lagrangian and standard model neutrino mixing with a fourth, sterile neutrino in the analysis of short-baseline, neutrino experiments. We focus on the muon decay at rest (DAR) results from the Liquid Scintillation Neutrino Experiment (LSND) and the Karlsruhe and Rutherford medium Energy Neutrino Experiment (KARMEN), seeking a reconciliation between the two. Both (v) over bar (e) appearance from (v) over bar (mu) oscillation and (v) over bar (epsilon) survival after production from NSI decay of the mu(+) contribute to the expected signal. This is a unique feature of our scheme. We comment on further implications of the lepton number violating interaction and sterile neutrino-standard neutrino mixing.