CERN Accelerating science

ATLAS Note
Report number	ATL-PHYS-PROC-2016-096
Title	Measurement of the $t\bar{t}Z$ cross section in the four lepton channel at 13 TeV with ATLAS
Author(s)	Schulte, Alexandra
Collaboration	ATLAS Collaboration
Publication	2016
Imprint	21 Jul 2016
Number of pages	4
In:	PoS LHCP2016 (2016) 238
In:	4th Conference on Large Hadron Collider Physics 2016 (LHCP 2016), Lund, Sweden, 13 - 18 Jun 2016, pp.238
DOI	10.22323/1.276.0238
Subject category	Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Free keywords	ttZ cross section ; top quark pair ; four leptons ; 13 TeV ; TOP
Abstract	The measurement of a Z boson together with a top quark pair in the four lepton channel is presented. The analysis uses the first 3.2 fb$^{-1}$ data at $\sqrt{s}=$13 Te\kern -0.1em V which were recorded by the ATLAS detector at the Large Hadron Collider in 2015. The inclusive t\={t}Z cross section is extracted using a likelihood fit to signal and control regions in the three and four lepton channel, resulting in $\sigma _{\textit{t\={t}Z}} = 0.92 \pm 0.30 \mathrm{(stat.)} \pm 0.11 \mathrm{(syst.) pb}.$
Copyright/License	Preprint: (License: CC-BY-4.0)

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