Dresden 2013 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 38: Top-Quarks: Single-Top 1

T 38.6: Vortrag

Dienstag, 5. März 2013, 18:00–18:15, HSZ-04

W-associated production of single top-quarks decaying into leptons and jets (ATLAS) — •Sebastian Mergelmeyer, Ian C. Brock, Irina Cioară, Thomas Loddenkötter, Pienpen Seema, and Jan A. Stillings — 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), which has so far eluded discovery. The close similarity of its final state to that of top+0.01em-quark pair production, with its ∼10 times larger cross section, 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 variables are used to discriminate the Wt signal from its major background, at the same time keeping ever-present systematic uncertainties under control. Results based on ∼25 fb^-1 of pp+0.01em-collision data recorded with the ATLAS detector at √s =8 T-0.05eme-0.11emV are presented.