Search for CP violation in ttH and tH production in multilepton channels with CMS

A measurement of the CP structure of the Yukawa interaction between the Higgs boson (H) and top quarks in event samples enriched in association of a H with one (tH) or two (tt H) top quarks, is presented. The measurement is based on data collected in proton-proton collisions at √s = 13 TeV by the CMS experiment at the CERN LHC, corresponding to an integrated luminosity of 137 fb−1. The analysis targets events where the H decays via H →WW or H → ττ and the top quark(s) decay either leptonically or hadronically. Separation of CP-even from CP-odd scenarios is achieved by applying machine learning techniques to final states characterized by the presence of at least two leptons.