Mitchell Institute for Fundamental Physics & Astronomy
College Station, Texas 77843
A search for compositeness in electrons and muons is presented using 5 fb-1 of data collected with the CMS detector. Excited leptons (*) are assumed to be produced via contact interactions in conjunction with a Standard Model lepton followed by decay through the process * -> giving a very clean final state consisting of two high PT leptons and a high ET photon.
2 candidate events are observed in the data after the analysis cut on the search variable and they are found to be consistent with the Standard Model prediction. For a contact interaction scale of Λ = Mass, masses below 1.9 TeV/c2 are excluded.