Bonn 2010 – scientific programme
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T: Fachverband Teilchenphysik
T 33: Elektroschwache Wechselwirkung I
T 33.9: Talk
Wednesday, March 17, 2010, 16:00–16:15, HG IV
Prospects to Study W→τν Decays with the Initial 100 pb−1 of ATLAS Data — •Guilherme Nunes Hanninger1, Jochen Christian Dingfelder2, Jürgen Kroseberg1, and Norbert Wermes1 — 1Physikalisches Institut, Bonn University — 2Physikalisches Institut, Freiburg University
Tau leptons play an important role in the LHC physics program, for example in searches for a low-mass Higgs boson or supersymmetry. Decays of Standard Model particles to tau leptons, in particular Z→ττ and W→τν, are background processes in such searches, and the corresponding cross sections and decay rates need to be measured beforehand. These SM decays will also be used to ensure that the hadronically decaying tau reconstruction and identification algorithms are sufficiently well understood. The perspectives for a first observation of hadronically decaying tau leptons from W→τν process with the ATLAS experiment at the LHC will be discussed. This study is based on state-of-the-art Monte Carlo event generators and a full simulation of the detector response. We assume an LHC center-of-mass energy of 10TeV, an integrated luminosity of 100pb−1 and an instantaneous luminosity of 1031cm−2s−1. The analysis utilizes the current tau reconstruction and identification algorithm developed for the initial data taking phase. The results will be presented with particular emphasis on systematic studies, pileup effects as well as on potential methods to extract the dominant QCD multi-jet background from ATLAS data.