Göttingen 2012 – scientific programme

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T: Fachverband Teilchenphysik

T 27: QCD mit schweren Eichbosonen 1

T 27.6: Talk

Wednesday, February 29, 2012, 18:05–18:20, ZHG 009

Measurement of the Z→ττ cross section in proton proton collisions with the ATLAS experimen — •Daniele Capriotti, Oliver Kortner, Sandra Kortner, and Hubert Kroha — Max-Planck-Institut für Physik, München, Deutschland

A measurement of the Z→ττ cross section is presented with about 1.5 fb⁻¹ of data collected during 2011 by the ATLAS detector at the Large Hadron Collider. The selection of a high-purity Z→ττ sample, where one of the two τ-leptons decays hadronically and the other one leptonically, is challenging due to the several orders of magnitude larger multi-jet background. The cross section, including determination of the muon efficiencies from data, and the estimation of the multi-jet background with a data driven technique are described.