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T: Fachverband Teilchenphysik

T 42: Top-Quarks: Produktion I

T 42.2: Vortrag

Dienstag, 20. März 2018, 16:45–17:00, Z6 - SR 2.011

Search for single top quark production in association with a W and a Z boson in the 3ℓ channel with the ATLAS experiment at 13 TeV — Julien Caudron¹, Markus Cristinziani¹, Mazuza Ghneimat¹, Carlo A. Gottardo¹, Sebastian Heer¹, Vadim Kostyukhin¹, •Ö. Oğul Öncel^1,2, Arshia Ruina¹, and Andrea Sciandra¹ — ¹Physikalisches Institut, Universität Bonn — ²Institut für Kernphysik, Universität zu Köln

Production of tWZ in pp collisions is a rare process predicted by the Standard Model with an expected cross section of less than 0.01 pb. As it has not been measured yet, it is one of the current research frontiers in top-quark physics. The tWZ is also important in other top-quark related measurements: for example in ttZ production, as an important background. A better understanding of this process will contribute to the improvement of other measurements as well.

A search for this process in the 3ℓ-channel using ATLAS data collected at the LHC during 2015 & 2016 with 36.1 fb⁻¹ integrated luminosity and at a center-of-mass energy of 13 TeV is presented. The main challenges are the small cross section and the irreducible background contaminations from the WZ and ttZ processes. This talk will present the current progress in addressing those challenges, particularly with the help of multivariate techniques.