This thesis deals with two main procedures performed with the ATLAS
detector at the Large Hadron Collider (LHC). The noise description
in the hadronic calorimeter TileCal represents a very valuable
technical job. The second part presents a fruitful physics analysis
- the cross section measurement of the process p+p Z0 + . The Monte
Carlo simulations of the TileCal are described in the first part of
the thesis, including a detailed treatment of the electronic noise
and multiple interactions (so-called pile-up). An accurate
description of both is crucial for the reconstruction of e.g. jets
or hadronic tau-jets. The second part reports a Standard Model
measurement of the Z0 + process with the emphasis on the final
state with an electron and a hadronically decaying tau-lepton. The
Z0 + channel forms the dominant background in the search for Higgs
bosons decaying into tau lepton pairs, and thus the good
understanding achieved here can facilitate more sensitive Higgs
detection.
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