Mainz 2014 – scientific programme

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T: Fachverband Teilchenphysik

T 61: Top-Quarks: Single Top

T 61.4: Talk

Tuesday, March 25, 2014, 17:30–17:45, P102

W-associated production of single top-quarks decaying into leptons and jets (ATLAS) — •Sebastian Mergelmeyer, Ian C. Brock, Irina Cioară, Pienpen Seema, Jan A. Stillings, and Thomas Velz — Universität Bonn

Single top+0.01em-quark production has a sizable contribution to the overall top+0.01em-quark production cross-section at the LHC, opening an opportunity to probe electroweak couplings and discover new physics. One important production mode is the creation of a top quark in association with a W boson (Wt mode). The close similarity of its final state to that of top+0.01em-quark pair production, with its ∼10 times larger cross section, poses difficulties for the theoretical calculations, and makes the measurement a challenging endeavour.

This analysis focuses on events with one lepton, three jets, one of which is a b+0.01em-quark jet, and missing transverse energy. Multivariate techniques with carefully chosen inputs are used to discriminate between the Wt signal and its major backgrounds. Results based on 20 fb^-1 of pp+0.01em-collision data recorded with the ATLAS detector at √s =8 T-0.05eme-0.11emV are presented.