Aachen 2019 – scientific programme

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T: Fachverband Teilchenphysik

T 35: Top-Physik I

T 35.3: Talk

Tuesday, March 26, 2019, 16:30–16:45, S10

Measurement of the Single Top tW Inclusive Cross-Section in the Single Lepton Final State at 13 TeV with ATLAS — Ian C. Brock and •Federico G. Diaz Capriles — Physikalisches Institut, University of Bonn

Single top-quark production in association with a W boson (known as the tW channel) is measured in the ATLAS detector at the Large Hadron Collider. Single top-quark cross-section measurements allow for a precise test of Standard Model physics and can aid in the discovery of new physics. The tW channel has the second largest cross-section of the three main single top production processes and it is sensitive to different new physics from that of the s - and t -channels. In this work, tW production is studied in the lepton plus jets channel by selecting events with three jets, one lepton and some amount of missing transverse momentum. Separation of signal and background events is performed by a neural network trained on Monte Carlo samples. This training helps identify the tW signal from its more prominent backgrounds, top-quark pair production and W in association with jets events, which share similar signatures but have much larger cross-sections. Lastly, a likelihood fit is performed to extract the signal cross-section.