A study of Higgs CP properties using the Higgs Characterization Model and top associated production
Abstract
This study utilises the Higgs Characterization model to investigate the CP properties of the Higgs coupling to the top quark using the tH and ttH generation processes. This is done via simulations of proton-proton collisions with ATLAS detector conditions, which are calculated for seven different CP eigenstates using MadGraph5aMC@NLO. Three orthogonal categories of cuts are subsequently implemented to find the cut efficiencies, which are used in conjunction with the cross-section to find the signal strength. Comparing the signal strength with experimental results shows that one cannot yet conclusively rule out any Higgs CP eigenstates. Analysing histograms showed that the most CP sensitive variables were the transverse momenta of the Higgs, leptons and photons, which showed a hardening as the Higgs coupling became CP odd.