Searches for Excited Leptons in $\sqrt{s}$ = 8 and 13 TeV CMS Data

Thisthesisisaboutsearchesforexcitedleptons,beingperformedwithCMSdatafromproton- proton collisions. The presented analyses are based on data of an integrated luminosity of 19.7fb 1 that was taken during 2012 at ps = 8 TeV (Run I), and 2.7fb 1 from the 2015 period at ps = 13 TeV (Run II). Excited leptons (`) are expected to be sign for a possible lepton compositeness. Both analyses from the two different datasets consider the production of an excited muon () in association with another muon via contact interactions. The considered decay mode into another muon and a photon leads to a -final state. The factors f and f0, that regulate the coupling between excited and Standard Model leptons, are assumed to be one. The observed data is consistent with the expectation from the Standard Model. Limitsaresetontheexcludedsignalcrosssection, aswellasontheexcitedmuonmass and the compositeness scale parameter . Masses from 200GeV up to 2:5(3) TeV M = are excluded with the Run I (Run II) analysis. At low excited muon masses, values of up to 17(15)TeV are excluded. Combining the results from Run I and Run II extends the exclusion in up to 19TeV. Results from other Run I analyses that consider neutral current decays of excited electrons and muons are also evaluated. Since these channels are also sensitive to different configurations of f and f0, excited electron (muon) masses are excluded up to 2.35(2.4)TeV for the case that M` = and f = f0 = 1.