Hamburg 2016 – scientific programme

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T: Fachverband Teilchenphysik

T 2: Higgs-Boson (Zerfall in Tau-Leptonen) I

T 2.5: Talk

Monday, February 29, 2016, 12:00–12:15, VMP5 HS A

Measurement of fake rates for hadronically decaying τ leptons in the ATLAS experiment — •Timo Dreyer, Michel Janus, and Stan Lai — II. Physikalisches Institut, Georg-August-Universität Göttingen

The τ lepton is the heaviest lepton in the standard model and an important probe of physics at high energy scales. The joint observation of the H→ τ τ signal in 2015 by the CMS and ATLAS experiments, for example, was the first direct observation of the Higgs boson coupling to fermions.

For signatures involving hadronically decaying τ leptons, it is important to have a good understanding of the τ reconstruction and identification algorithms that are used for data analysis in the ATLAS experiment. In particular, the probability for jets originating from quarks and gluons to be misidentified as hadronically decaying τ leptons (the so-called fake rate), is important for background estimation from a variety of sources. This fake rate depends on many kinematic variables, as well as the quark-gluon composition of the process in question.

This talk presents an approach using 13 TeV ATLAS data, to measure the fake rate using the tag-and-probe technique. The dependence of the fake rate on the above mentioned factors is also discussed.