Würzburg 2018 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 42: Top-Quarks: Produktion I

T 42.6: Vortrag

Dienstag, 20. März 2018, 17:45–18:00, Z6 - SR 2.011

Single top production in association with a Z boson with ATLAS — •Marius Blaut and Jan C. Brock — Physikalisches Institut, University of Bonn

Evidence of the electroweak process in which a Z boson is radiated in t-channel single top-quark production (tZq channel) was first reported by the ATLAS collaboration after analyzing 13 TeV data collected in 2015 and 2016. The analysis, which was performed in the trilepton final state, is extended by adding data collected in 2017.

The trilepton decay topology of this process is characterised by one jet originating from a b quark, three charged leptons with high transverse momentum (including an opposite sign, same flavour pair from the Z boson) and one light-quark jet that tends to be in the forward direction and missing transverse momentum.

The main sources of background are diboson and ttZ production, as well Z+jets and tt events with a lepton which is fake or non-prompt. The data-driven technique used to estimate the non-prompt and fake lepton background will be presented along with the preliminary results of this analysis.