Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 5: Electroweak Interactions (Exp.) 1

T 5.8: Vortrag

Montag, 21. März 2022, 18:05–18:20, T-H18

Measurement of Zγγ and ZZγ final states with the ATLAS detector at the LHC — •Anke Ackermann and Philipp Ott — Kirchhoff-Institute for Physics, Heidelberg University

The Standard Model of Particle Physics (SM) predicts the rare production of triboson states, in which three gauge bosons are produced simultaneously. Although suffering from small cross sections and hence a limited amount of signal events, such triboson states can be studied with the vast amount of data that is collected by the ATLAS detector in Run 2. In addition to validating the predictions of the SM for rare processes, sensitivity to New Physics is given via anomalous quartic couplings of e.g. four neutral gauge bosons. This talk will focus on the analysis of the simultaneous production of ZZγ as well as Zγγ. In order to determine the cross sections of those processes, it is crucial to separate signal events from events arising through background processes mimicking the signal topology. The most dominant background process contains fake photons, which are non-prompt photons within jets. Different data-driven methods are used to estimate the amount of fake photons in the signal region. After giving a general introduction about the triboson production of the processes Zγγ and ZZγ, a short summary of the two analyses, including the event selection, the background estimation and a study for effects of New Physics, is presented.