Search for Excited Leptons in pp collisions at $\sqrt{s} = 7$ ~TeV

A search for excited leptons, carried out with the CMS detector in pp collision at the LHC with $\sqrt{s} = 7$ ~TeV, is presented. The search has been performed for an associated production of a lepton and an oppositely charged excited lepton $pp \rightarrow ll^*$, followed by the decay $l^*\rightarrow l\gamma$, resulting in $ll\gamma$ final state, where $l=e,\mu$. No excess above the standard model expectation is observed in the data. Interpreting the findings in the context of $l^*$ production through four-fermion contact interactions and $l^*$ decay via electroweak processes, upper limits are reported for $l^*$ production at this collision energy and the exclusion region in the $\Lambda-M$($l^*$) parameter space is extended beyond the previously established limits.