Speaker
Description
We present the first evidence for the production of a top quark in association with a W and a Z boson. The analysis employs proton-proton collision data collected in the years 2016-2018 at a center-of-mass energy of 13 TeV by the CMS Experiment, for a total integrated luminosity of 138 fb$^{-1}$.
We target the multilepton final state of the process, where we consider two charged leptons being produced in the decay of the Z boson and a third lepton arising from the decays of either the top quark and the W boson.
The analysis defines various signal and control regions and makes use of several machine learning algorithms in order to achieve high sensitivity to the signal and discrimination of the background processes.
Finally, we measure the cross section for the production of the process to be 354 $\pm$ 54 (stat) $\pm$ 95 (syst) fb, corresponding to a statistical significance of 3.4 standard deviations.
