Aachen 2019 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 58: Top-Physik II

T 58.7: Vortrag

Mittwoch, 27. März 2019, 17:30–17:45, S10

Iterative Bayes Unfolding for ttγ production using full Run2 pp collisions with the ATLAS detector — •John Meshreki and Ivor Fleck — Universität Siegen

The top-quark has a unique position in the Standard Model of elementary particle physics. Due to its large mass, it has a very short lifetime, which allows it to decay to a W boson and b-quark almost 100% of the time and pass its spin information on to its decay products. This permits to test the validity of the SM as well as unraveling hints of theories beyond the Standard Model.
This talk presents the Iterative Bayes Unfolding (IBS) for the differential cross-section measurement of the top-quark pair production associated with a photon using full Run2 proton-proton collisions data collected by the ATLAS detector. The IBS estimates the initial distribution needed by Bayes’ theorem through an iterative approach. It gives stable results with respect to variations of the initial probabilities and of the smoothing procedures. The IBS method is performed in the electron-muon channel to remove experimental distortions, due to the detector’s limitations, for observed detector-level observables allowing to estimate their "truth-level" spectra. Such truth-level distribution will be used in measuring the differential cross-section as a function of the observable.