Dresden 2013 – scientific programme

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T: Fachverband Teilchenphysik

T 38: Top-Quarks: Single-Top 1

T 38.3: Talk

Tuesday, March 5, 2013, 17:15–17:30, HSZ-04

Single top quark production in the Wt channel at ATLAS with 2011 data — •Jan A. Stillings, Ian C. Brock, Irina Cioară, Thomas Loddenkötter, Sebastian Mergelmeyer, and Pienpen Seema — Physikalisches Institut, Universität Bonn

Single top quark production is the second largest source of top quarks from proton-proton collisions at the LHC. It has a lower cross-section than the tt production process and is also harder to separate from the background. There are several channels which produce single top quarks in the final state. Of these, the Wt channel is expected to have a measurable contribution. Its decay topology consists of a hard b-quark jet originating from the top quark decay as well as two W bosons. The analysis presented focuses on the lepton+jets channel where one W boson decays hadronically and the other one decays leptonically. In this talk, the isolation of the signal using an artificial neural network and the extraction of the signal from the resulting combined variable is presented using ATLAS pp collision data from the year 2011.