CERN Accelerating science

Thesis
Report number	CERN-THESIS-2010-355
Title	Search for the Lepton Flavor Violating Decay Z→eμ
Author(s)	Fernando, Waruna Sri (Ohio State U.)
Publication	130.
Thesis note	PhD : Ohio State U. : 2010
Thesis supervisor(s)	Gan, K.K.
Subject category	Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Abstract	We present a search for the lepton flavor violating decay Z→eμ in proton-proton collisions at a center of mass energy of 7 TeV using approximately 3.1 pb$^{-1}$ of data recorded with the ATLAS detector at the CERN large hadron collider. Candidate events have two isolated high p$_{T}$ leptons (an electron and a muon), no jets, and little missing transverse energy. We observe no events with eμ invariant mass above 60 GeV/c$^{2}$. This demonstrates that we can suppress the eμ background to a negligible level and are sensitive to exotic eμ production. We set 95% confidence upper limit on the Z→eμ branching ratio of 2.0 × 10$^{-4}$.

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