Volume 330 - An Alpine LHC Physics Summit (ALPS2018) - Young Scientist Forum
Measurement of the cross-section for the associated production of a top quark pair and a W or Z boson with the ATLAS detector
S. Heer*  on behalf of the ATLAS Collaboration
Full text: pdf
Pre-published on: July 31, 2018
Published on: September 20, 2018
Abstract
In the Standard Model the coupling of the top quark to a vector boson
is predicted via the weak interaction. New physics beyond the Standard Model
can modify the $t\bar{t}V$ cross-section. As an example several of the operators
introduced by effective field theory are sensitive to the $t\bar{t}Z$ and $t\bar{t}W$
production cross-sections. Multiple analysis channels with 2, 3 or 4 lepton
final-states have been considered in the latest $t\bar{t}V$ cross section measurement
by the ATLAS experiment located at the Large Hadron Collider (LHC). The dominant backgrounds in the analysis are
mis-reconstructed leptons and the diboson process, depending on the analysis
channel. A two-dimensional fit of the $t\bar{t}W$ and $t\bar{t}Z$ cross-section is performed
to interpret possible deviations from the Standard Model.
DOI: https://doi.org/10.22323/1.330.0049
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