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TY  - THES
AU  - Endres, Matthias
TI  - Searches for Excited Leptons in √s=8 and 13 TeV CMS Data
PB  - RWTH Aachen University
VL  - Dissertation
CY  - Aachen
M1  - RWTH-2017-04481
SP  - 1 Online-Ressource (ix, 145 Seiten) : Illustrationen, Diagramme
PY  - 2017
N1  - Veröffentlicht auf dem Publikationsserver der RWTH Aachen University
N1  - Dissertation, RWTH Aachen University, 2017
AB  - This thesis is about searches for excited leptons, being performed with CMS data from proton-proton collisions. The presented analyses are based on data of an integrated luminosity of 19.7 /fb that was taken during 2012 at √s=8 TeV (Run I), and 2.7 /fb from the 2015 period at √s=13 TeV (Run II). Excited leptons (l*) are expected to be sign for a possible lepton compositeness. Both analyses from the two different datasets consider the production of an excited muon (µ*) in association with another muon via contact interactions. The considered decay mode into another muon and a photon leads to a µµγ-final state. The factors f and f' 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. Limits are set on the excluded signal cross section, as well as on the excited muon mass and the compositeness scale parameter Λ. Masses from 200 GeV up to 2.5(3) TeV ≤ M_µ = Λ are excluded with the Run I (Run II) analysis. At low excited muon masses, values of Λ up to 17(15) TeV are excluded. Combining the results from Run I and Run II extends the exclusion in Λ up to 19 TeV. 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 f', excited electron (muon) masses are excluded up to 2.35(2.4) TeV for the case that M_l* = Λ and f=-f'=1.
LB  - PUB:(DE-HGF)11
DO  - DOI:10.18154/RWTH-2017-04481
UR  - https://publications.rwth-aachen.de/record/689629
ER  -