Dortmund 2021 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

T: Fachverband Teilchenphysik

T 9: Associated Higgs production and Higgs quantum numbers I

T 9.4: Vortrag

Montag, 15. März 2021, 16:45–17:00, Ti

Neural network development in the analysis of single top-quark production in association with a Higgs boson and light-quark at ATLAS — •Christian Kirfel, Ian Brock, and Tanja Holm — Physikalisches Institut Bonn

A measurement of the single top-quark production in association with a Higgs boson and a spectator light-quark (tHq) gives insight into the properties of not only the top quark but also the Higgs boson. The associated production is uniquely sensitive to the relative sign of the top quark-Higgs boson Yukawa coupling. Additionally, the ditau decay of the Higgs boson allows for a reconstruction of the Higgs mass.

The extraction of a signal is limited by the plethora of background processes with higher cross sections. This makes the usage of multivariate analysis methods a necessary choice.

A variety of new methods have been used to optimise the network, including an evolutionary optimisation process. In addition, the use of negative weights in the training has been investigated. Both the development and the results of a deep neural network for the separation of the tHq channel from its backgrounds are presented.