Nunes Hanninger, Guilherme: Observation of W → τντ Decays with the ATLAS Experiment. - Bonn, 2011. - Dissertation, Rheinische Friedrich-Wilhelms-Universität Bonn.
Online-Ausgabe in bonndoc:
author = {{Guilherme Nunes Hanninger}},
title = {Observation of W → τντ Decays with the ATLAS Experiment},
school = {Rheinische Friedrich-Wilhelms-Universität Bonn},
year = 2011,
month = may,

note = {Physics studies of processes with t leptons in the final state, while challenging at hadron colliders, are of great importance at the LHC. The τ leptons provide important signatures in searches for the Higgs boson as well as for new physics in a wide range of theoretical models. Decays of Standard Model particles to τ leptons, in particular Z→ττ and W → τντ, are important background processes in those searches and their cross sections need to be measured first. This thesis reports the first observation of W → τντ decays and of hadronically decaying τ leptons with the ATLAS experiment at the LHC. The analysis is based on a data sample corresponding to an integrated luminosity of 546 nb-1, which was recorded at a proton-proton centre-of-mass energy of 7TeV. A total of 78 data events are selected, with an estimated background of 11.1±2.3(stat.) ±3.2(syst.) events from QCD processes, and of 11.8±0.4(stat.) ±3.7(syst.) events from other W and Z decays. The observed excess of data events over the total background is compatible with the SM expectation for W → τντ decays, both in the number of events and in the shapes of distributions of characteristic variables.},
url = {}

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