Wuppertal 2015 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 88: Neue Physik: Dunkle Materie, Leptoquarks, Suche nach angeregten Leptonen
T 88.6: Vortrag
Donnerstag, 12. März 2015, 18:05–18:20, L.09.31 (HS 11)
Search for heavy leptons at the ATLAS experiment — •Benedict Winter, Liv Wiik-Fuchs, and Jochen Dingfelder for the ATLAS collaboration — Physikalisches Institut, Universitaet Bonn, Nussallee 12, 53115 Bonn
The Standard Model of Particle Physics does not explain why the masses of the neutrinos are much smaller than the masses of the other fermions. This mass hierarchy can be generated in a natural way by the Seesaw Mechanism. It can for example be realized through an extension of the Standard Model by a fermionic triplet (Seesaw Type-III) with fermion masses at the electroweak scale. Through the gauge couplings of the triplet, pairs of the new particles are produced in Drell-Yan processes. They then decay into a gauge boson or a Higgs boson and a light lepton and thus leave a clear signature in the detector.
In this talk a search for final states with three charged leptons, originating from the decay of a Seesaw neutrino into a Z boson and an additional charged lepton is presented. The results presented are based on the 20.3fb−1 collected at a center of mass energy of √s = 8TeV. A main focus is set on the background estimation and the limit setting procedure.