Münster 2017 – scientific programme
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T: Fachverband Teilchenphysik
T 5: Elektroschwache Wechselwirkung 1
T 5.4: Talk
Monday, March 27, 2017, 17:30–17:45, JUR 372
Analysis of Z boson pair production with ATLAS at √s=13 TeV: Background determination and search for anomalous triple gauge couplings — •Maurice Becker and Stefan Tapprogge — Universität Mainz
The LHC gives a great opportunity to test the Standard Model of particle physics at a high energy regime.
One of the predictions that the electro weak sector of the Standard Model does is the production of two Z bosons. This process
is not only a background contribution of many analyses that are done at the LHC, it can also be used to search
for couplings that do not occur
in the Standard Model like the coupling of three neutral gauge bosons.
An overview of an analysis with two Z bosons in the final state with data that where taken with the ATLAS detector
in 2015 and 2016 at √s=13 TeV is presented. The analysis is done for two on shell Z bosons (66 GeV<ml+l−<116 GeV) using only electron or muon final states due to the low
background contribution in this decay channel. The focus is set on the determination of background that arise from mis-identified electrons or muons
or leptons from second decay vertices. Since this background is difficult to model a data driven approach is chosen. Furthermore it is shown
how a search for anomalous couplings can be done using the pT distribution of the Z boson with higher transverse momentum.