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T: Fachverband Teilchenphysik

T 88: Top quarks: associated production

T 88.2: Vortrag

Donnerstag, 2. April 2020, 16:45–17:00, L-4.001

Measurement of ttZ with hadronically decaying Z bosons — •Valerie Scheurer — DESY

In the Standard Model of particle physics the coupling of top quark and Z boson is an important quantity to probe for possible deviations that hint to new physics. This coupling can be measured in the associated production of top quark pairs with a Z boson. This process has been observed with leptonically decaying Z bosons. However in the region of high Z boson p_T, where the deviation is expected to be strongest, this measurement is not sensitive. In that region the measurement of ttZ with a hadronically decaying Z boson can provide additional sensitivity due to the large branching ratio of that process. However the background in that region is very high. Signal and background are separated using a dedicated deep neural network. The development and application of this technique is the topic of this talk.