Wuppertal 2015 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 56: Experimentelle Methoden: unterschiedliche Techniken

T 56.2: Vortrag

Dienstag, 10. März 2015, 17:05–17:20, K.12.18 (K3)

A data-driven technique to model the decay of Z bosons into tauons — Joram Berger, Rene Caspart, Fabio Colombo, Felix Frensch, Raphael Friese, Andrew Gilbert, Thomas Müller, Günter Quast, •Benjamin Treiber, and Roger Wolf — Karlsruhe Institute of Technology

The first direct evidence of the Higgs boson coupling to leptons was presented by the ATLAS and CMS collaborations with a significance of more than 3 σ in the H → ττ decay channel. One of the many elements of the related analysis is a data-driven technique to reduce uncertainties in the main source of background to the signal, coming from Z → ττ decays.

This method is based on recorded Z → µµ collision data of which the muons can be selected with a high efficiency and purity. The muons are then replaced with simulated τ leptons. Using this method, the contribution from Z bosons decaying into two tauons can be studied with lower systematic uncertainties than one could achieve from pure Monte-Carlo simulation.

The technique, its principles and methods will be introduced as well as various steps of validation. Additionally, current limitations to it will be shown.