Wuppertal 2015 – scientific programme

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T: Fachverband Teilchenphysik

T 46: Top: Boosted b-tagging, single top

T 46.8: Talk

Tuesday, March 10, 2015, 18:30–18:45, L.09.31 (HS 11)

W-associated production of single top-quarks decaying into leptons and jets (ATLAS) — •Sebastian Mergelmeyer — Universität Bonn

Single top quark production accounts for ∼1/3 of the overall top quark production cross-section at the LHC, opening a great opportunity to probe electroweak couplings. One important production mode in the Standard Model is the creation of a single top quark in association with a W boson (Wt mode). However, the close similarity of its final state to that of top quark pair production, which has a ∼10 times larger production cross-section, makes the measurement a challenging endeavour.

This analysis focuses on the channel where the Wt system decays into 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. So far no experiment has measured the Wt mode in this channel.

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 will be presented.