Search for new physics in lepton + MET final states

A search for new physics in final states with an electron or a muon and a low mass neutrino is presented based on the full 2012 data set at sqrt(s)=8TeV. The analysis searches for an excess of events above the SM expectation in the l+MET transverse mass spectrum. The results are interpreted in several different models, such as a new, heavy SM-like boson W with and without interference with the SM W-boson, split UED and a four-fermion contact interaction as a sign of fermion compositeness. We also present a model independent cross section limit.